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詳細
大塚　夏彦(オオツカ　ナツヒコ)
北極域研究センター
特任教授
researchmap個人ページ
Last Updated :2023/11/02

基本情報

所属

  • 北極域研究センター

職名

  • 特任教授

学位

  • 工学博士（北海道大学）

科研費研究者番号

  • 50520201

J-Global ID

研究キーワード

  • 北極海航路   耐震工学   海岸工学   海上物流   氷工学   北極   

研究分野

  • フロンティア（航空・船舶） / 船舶海洋工学 / 海上物流

職歴

  • 2016年07月 - 現在 北海道大学 北極域研究センター 教授
  • 2009年04月 - 2016年06月 北日本港湾コンサルタント株式会社 企画部 部長

学歴

  • 1998年04月 - 2001年03月   北海道大学   大学院   工学研究科
  • 1977年04月 - 1981年03月   北海道大学   工学部   土木工学科

所属学協会

  • 日本海洋政策学会   土木学会   

研究活動情報

論文

  • Chathumi Ayanthi Kavirathna, Ryuichi Shibasaki, Wenyi Ding, Natsuhiko Otsuka
    TRANSPORTATION RESEARCH PART D-TRANSPORT AND ENVIRONMENT 123 2023年10月 
    Despite shortening voyages between Asia and Europe by the Northern Sea Route (NSR) over the Suez Canal route (SCR), increased NSR's traffic intensifies vessel-based emissions to the Arctic Sea. This study investigates NSR's feasibility with a combination of operational and regulatory emissions control (EC) measures against the SCR and NSR's status quo without EC measures to derive sustainable policy without harming the NSR's economic feasibility. A mixed-integer nonlinear optimization model decides optimum speeds and heavy fuel oil (HFO)-banned areas for minimizing cost and emissions via NSR. Some scenarios indicate fewer emissions and costs from NSR with EC measures than NSR's status quo and SCR when emissions taxes are enforced on both routes. EC measures affect NSR's feasibility depending on ice conditions (ice-free, medium ice, and heavy ice scenarios) and slow steaming potential. A trade-off between economic and environmental objectives encourages combining operational and regulatory EC measures to support NSR's feasibility.
  • Navigability assessment of ships in ice using ice chart information
    Shotaro Uto, Takatoshi Matsuzawa, Koh Izumiyama, Natsuhiko Otsuka
    Port and Ocean Engineering under Arctic Conditions (POAC) 2023年 [査読有り][通常論文]
  • 大塚 夏彦, 小浜 等
    寒地技術論文・報告集 寒地技術シンポジウム / 北海道開発技術センター 編 38 265 - 268 北海道開発技術センター 2022年
  • Mario Acquarone, Paul Arthur Berkman, Bodil Bluhm, Tom Christensen, Alain Dupuis, Karen Edelvang, Hauke Flores, Anne Kirstine Frie, Maria Gavrilo, Harald Gjøsæter, Jackie Grebmeier, Bjørn Einar Grøsvik, Kevin Hedges, Martine van den Heuvel-Greve, Taka Hirata, Alf Håkon Hoel, Haakon Hop, Randi Ingvaldsen, Lis Lindal Jørgensen, Kathy Kuletz, Pauline Snoeijs Leijonmalm, Anders Mosbech, Jessica Nilsson, Shigeto Nishino, Fujio Ohnishi, Natsuhiko Otsuka, Sei-Ichi Seito, Lisa Speer, Mette Skern-Mauritzen, Cecilie von Quillfeldt
    2022年01月 [査読有り][通常論文]
  • Chathumi Ayanthi Kavirathna, Ryuichi Shibasaki, Wenyi Ding, Natsuhiko Otsuka
    International Association of Maritime Economists (IAME 2021) 2021年11月 [査読有り][通常論文]
  • Chathumi Ayanthi Kavirathna, Ryuichi Shibasaki, Wenyi Ding, Natsuhiko Otsuka
    Proceedings of the 26th International Conference on Port and Ocean Engineering under Arctic Conditions 2021-June 2021年06月 [査読有り]
     
    Owing to the emergent trends in Arctic shipping, different market and policy-based measures would be considered to minimize the negative impacts from vessel-based emissions to the fragile Arctic sea environment. This study analyzes the effectiveness of enforcing HFO-banned areas and emission tax for the environmental sustainability of Arctic shipping. The locations of potential HFO-banned areas are analyzed with an optimization model to minimize the total emissions and cost separately and three scenarios are analyzed with free-ice, medium-ice, and heavy-ice conditions based on daily ice-thickness data obtained from the Arctic Data ArchiveTOPAZ4 system. The analysis is done for a voyage from Asia to Europe and vessel speeds and location data are gathered from the Automatic Identification System (AIS). Vessel-based emissions are estimated following the IMO fourth GHGs study in 2020 which incorporates the vessel's engine load, propulsive power demanded at different speeds, and fuel consumption with auxiliary engines and boilers, among others. A spatial variation of the selected HFO-banned areas is observed when changing ice conditions while producing different levels of CO2, CH4, N2O, BC, and SOx emissions. Although the enforcement of HFO-banned areas and emission tax reduces the total emissions, it significantly increases the total cost of the voyage. The medium-ice condition generates the least emission level and significantly different results are derived from environmental and economic objectives with all scenarios.
  • Xiaoyang Li, Natsuhiko Otsuka, Lawson W. Brigham
    POLAR SCIENCE 27 2021年03月 
    Spatial and temporal variations of shipping along Russia?s Northern Sea Route (NSR) were investigated to better understand the possible drivers of traffic levels and future trends. Daily information for ships sailing along the NSR were collected, and voyage-based analyses were conducted for a period from March 2013 to December 2018. Annual total dead weight tonnage (DWT) increased significantly from 3.95 million tons in 2013 to 24.61 million tons in 2018, and most of this was carried by dry cargo ships, oil tankers and LNG carriers between Europe and the Kara Sea. Annual total DWT was relatively high during 2015?2017 for dry cargo ships, whereas annual total DWT increased rapidly for oil tankers from 2016 and for LNG carriers in 2018. The relatively high level of shipping for dry cargo ships during 2015?2017 is attributable to the Yamal LNG project construction, while the rapidly increased annual total DWT for oil tankers and LNG carriers is due to the transportation of crude oil from the Novy Port project, and LNG from the Yamal LNG project. Recent NSR shipping is mainly driven by development and marine transportation of Russian Arctic natural resources, and this increasing trend should become faster in the near future as operation of the Arctic LNG-2, Taymyr coal and other projects are commissioned.
  • Estimation of sailing speed through ice covered waters on the northern sea route
    Tateyama,K. Okuda, H, Otsuka, N
    Proc. of Civil Engineering Conference in the Asian Region CECAR 8 8 2019年04月 [査読無し][通常論文]
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  • Characteristics of sea ice condition for safe navigation along the Northern Sea Route
    Otsuka, N., Li, X., Izumiyama, K
    Proc. of Civil Engineering Conference in the Asian Region CECAR 8 8 2019年04月 [査読無し][通常論文]
    ダウンロード
  • Overview of recent shipping activities along the Northern Sea Route
    Li, X, Otsuka, N
    Proc. of Civil Engineering Conference in the Asian Region CECAR 8 8 2019年04月 [査読無し][通常論文]
    ダウンロード
  • OKUDA Hayato, TATEYAMA Kazutaka, OTSUKA Natsuhiko
    Proceedings of the International Symposium on Okhotsk Sea and Polar Oceans 34 273 - 274 2019年02月16日 [査読無し][通常論文]
  • 大塚夏彦, 中村栄作, ユハ・サウナワーラ, 大西富士夫
    Proceedings of the International Symposium on Okhotsk Sea and Polar Oceans 34 183 - 185 2019年02月16日 [査読無し][通常論文]
  • 大塚夏彦, 中村栄作, ユハ・サウナワーラ, 大西富士夫
    the 34th Intl. Symp. On Okhotsk Sea & Polar Oceans 34 159‐161  2019年02月16日 [査読無し][通常論文]
  • 李 肖陽, 大塚夏彦
    Proceedings of the International Symposium on Okhotsk Sea and Polar Oceans 34 155 - 158 2019年02月16日 [査読無し][通常論文]
  • 大塚夏彦
    the 34th Intl. Symp. On Okhotsk Sea & Polar Oceans 34 152 - 154 2019年02月16日 [査読無し][通常論文]
  • OHNISHI Fujio, SAUNAVAARA Juha, OTSUKA Natsuhiko
    Proceedings of the International Symposium on Okhotsk Sea & Polar Oceans 34 142 - 145 2019年02月16日 [査読無し][通常論文]
  • 大塚 夏彦
    海洋開発シンポジウム講演集 44 5p  土木学会海洋開発委員会 2019年
  • 大塚 夏彦
    土木学会論文集B3（海洋開発） 75 2 I_1036 - I_1040 公益社団法人 土木学会 2019年 [査読有り][通常論文]
     
    <p> 2017年に続いて2回目となる本セッションでは，北極海航路を実際に海洋開発プロジェクトの場として実施されたプロジェクトの概要と，技術的困難，課題とその取り組み，および今後の展望を紹介した．また，北極海航路のフィージビリティに関する海上物流分野および氷海工学分野にからの研究発表を行った．最後に総合討論として，北極海航路や北極圏の開発と商業利用における特徴的な課題と今後の展望について討議を行ない，海洋に関する工学研究者への情報提供とともに，議論の場を提供した．</p>
  • ABE Motohisa, OTSUKA Natsuhiko
    Asian Transport Studies (Web) 5 4 617‐634(J‐STAGE) - 634 2019年 [査読有り][通常論文]
     
    <p>Northern Sea Route (NSR) is focused on because it might bring a higher efficiency of logistics between Europe and Asia. However, until the route becomes a major transport route, there will be challenges. The purpose of this paper is to discuss both opportunities and challenges by focusing on different elements: technical feasibility, economic feasibility, and geopolitical/policy aspects. Regarding the technical feasibility, discussion starts with the monitoring of actual vessel movements. By analyzing transit time/reliability as well as navigability, current service levels and technical challenges are examined. Regarding the economic feasibility, we will mainly focus on the possible advantages of NSR for supply chain efficiency of shippers. Some conceptual ideas are proposed. Finally, the geopolitical and policy aspects are also critical. In this regard, recent policies including the Polar Silk Road are reviewed, and future prospects are examined.</p>
  • Furuichi Masahiko, Otsuka Natsuhiko
    MARITIME POLICY & MANAGEMENT 45 8 1057 - 1077 2018年11月17日 [査読有り][通常論文]
  • Takuya Nakanowatari, Jun Inoue, Kazutoshi Sato, Laurent Bertino, Jiping Xie, Mio Matsueda, Akio Yamagami, Takeshi Sugimura, Hironori Yabuki, Natsuhiko Otsuka
    Cryosphere 12 6 2005 - 2020 2018年06月15日 [査読有り][通常論文]
     
    Accelerated retreat of Arctic Ocean summertime sea ice has focused attention on the potential use of the Northern Sea Route (NSR), for which sea ice thickness (SIT) information is crucial for safe maritime navigation. This study evaluated the medium-range (lead time below 10 days) forecast of SIT distribution in the East Siberian Sea (ESS) in early summer (June-July) based on the TOPAZ4 ice-ocean data assimilation system. A comparison of the operational model SIT data with reliable SIT estimates (hindcast, satellite and in situ data) showed that the TOPAZ4 reanalysis qualitatively reproduces the tongue-like distribution of SIT in ESS in early summer and the seasonal variations. Pattern correlation analysis of the SIT forecast data over 3 years (2014-2016) reveals that the early summer SIT distribution is accurately predicted for a lead time of up to 3 days, but that the prediction accuracy drops abruptly after the fourth day, which is related to a dynamical process controlled by synoptic-scale atmospheric fluctuations. For longer lead times (> 4 days), the thermodynamic melting process takes over, which contributes to most of the remaining prediction accuracy. In July 2014, during which an ice-blocking incident occurred, relatively thick SIT (∼ 150 cm) was simulated over the ESS, which is consistent with the reduction in vessel speed. These results suggest that TOPAZ4 sea ice information has great potential for practical applications in summertime maritime navigation via the NSR.
  • OTSUKA Natsuhiko, YAMAGUCHI Hajime, TATEYAMA Kazutaka, KASHIWAGI Takao
    Proceedings of the International Symposium on Okhotsk Sea & Polar Oceans 33rd 124 - 125 2018年02月 [査読無し][通常論文]
  • OTSUKA Natsuhiko, LI Xiaoyang, IZUMIYAMA Koh
    Proceedings of the International Symposium on Okhotsk Sea & Polar Oceans 33rd 86 - 88 2018年02月 [査読無し][通常論文]
  • OKUDA Hayato, TATEYAMA Kazutaka, OTSUKA Natsuhiko
    Proceedings of the International Symposium on Okhotsk Sea & Polar Oceans 33rd 97 - 100 2018年02月 [査読無し][通常論文]
  • Natsuhiko Otsuka, Toru Tamura, Masahiko Furuichi
    Russia's Far North: The Contested Energy Frontier 43 - 63 2018年01月 [査読有り][通常論文]
     
    It is widely recognized that the Arctic sea ice has been decreasing for many years especially in summer. The Northern Sea Route (hereinafter abbreviated as NSR), which connects the Atlantic Ocean and the Pacific Ocean via the Russian Arctic coast from the Kara Sea to the Bering Strait, has become almost ice free every summer since 2010. The NSR can shorten the shipping distance between Europe and East Asia by 30 to 40 percent compared to the Suez Canal route. Due to the Arctic sea ice retreat, fuel oil price escalation, and increase in natural resource demand of East Asia in the early 2010s, the NSR attracted the attention of the world. At the same time, in terms of the feasibility of NSR international transit shipping between Europe and Asia, many uncertainties have been pointed out such as actual navigability, navigable season, possible sailing speed and sailing time within the NSR, necessity of icebreaker escort, shipping cost effectiveness, and so on.
  • 大塚 夏彦
    土木学会論文集B3（海洋開発） 74 2 I_1034 - I_1039 公益社団法人 土木学会 2018年 [査読有り][通常論文]
     
    地球温暖化に伴って北極海の海氷減少が顕著になるなか，北極海航路研究への国際的な関心が高まっており，その対象は理工学だけでなく，環境，経済・社会・国際政治など学際的な広まりを見せている．本特別セッションは，北極海航路の最新の動向，航路利用と北極をめぐる国際関係，北極海における石油・天然ガス開発の動向，北極海航路に関連する課題に関する日本における研究動向を紹介し，海洋に関する工学研究者への情報提供とともに，議論の場を提供した．
  • 大塚夏彦, LI Xiaoyang, 泉山耕
    土木学会論文集 B3(海洋開発)(Web) 74 2 I_25‐I_30(J‐STAGE) - I_30 公益社団法人 土木学会 2018年 [査読有り][通常論文]
     
    北極海航路を航行する船舶の航跡・航行速度を衛星AISにて取得し，氷海中における実際の航行実態を調査した．同時に，データ同化システムによる毎日の平均海氷密接度および海氷厚さから，各船が航行した位置の氷況を求め，氷海中の航行難易度を示す指標であるアイスインデックスを算出し，航行速度記録と比較分析を行った．この結果，氷海中での航行可能な速度を，アイスインデックスを用いて評価できる可能性のある事を示した．
  • OTSUKA Natsuhiko, LI Xiaoyang, IZUMIYAMA Koh
    Proceedings of the International Symposium on Okhotsk Sea and Polar Oceans 33rd 89 - 92 2018年 [査読無し][通常論文]
  • 大塚夏彦
    日本リモートセンシング学会学術講演会論文集(CD-ROM) 63rd ROMBUNNO.S3  2017年11月21日 [査読無し][通常論文]
  • 大塚夏彦
    寒地技術論文・報告集(CD-ROM) 33 ROMBUNNO.HOKKYOKU4 - 17 北海道開発技術センター 2017年11月 [査読無し][通常論文]
  • NAKANOWATARI Takuya, INOUE Jun, SATO Kazutoshi, YABUKI Hironori, SUGIMURA Takeshi, OTSUKA Natsuhiko
    Proceedings of the International Symposium on Okhotsk Sea & Polar Oceans 32nd 253 - 256 2017年02月 [査読無し][通常論文]
  • MORISHITA Hiroshi, TATEYAMA Kazutaka, OTSUKA Natsuhiko, OKUDA Hayato
    Proceedings of the International Symposium on Okhotsk Sea & Polar Oceans 32nd 270 - 273 2017年02月 [査読無し][通常論文]
  • Perspectives on the Northern Sea Route by Japanese Maritime Parties
    大塚夏彦
    The Arctic in World Affairs 261 - 268 2017年 [査読有り][招待有り]
  • 山口一, 大塚夏彦
    土木学会論文集 B3(海洋開発)(Web) 73 2 I_36‐I_41(J‐STAGE) - I_41 公益社団法人 土木学会 2017年 [査読有り][通常論文]
     
    地球全体に先駆けて北極域で進行する温暖化により，北極海の船舶航行環境が緩和されつつある．しかし北極海航路の利用は，環境や安全に最新の配慮を払って持続的に行われなければならない．本稿は，近年，北極海航路の持続的利用を目指して実施されてきた工学研究における研究課題への取り組みと研究成果を総括し，今後の課題について考察する．研究分野は，気象，衛星観測，海氷予測，波浪予測，着氷，船体への氷力，航路探索，経済性およびデータアーカイブを取り上げた．
  • 大塚夏彦, 大西富士夫, 泉山耕
    土木学会論文集 B3(海洋開発)(Web) 73 2 I_25‐I_30(J‐STAGE) - I_30 公益社団法人 土木学会 2017年 [査読有り][通常論文]
     
    2010年以降，北極海航路による東西輸送が拡大中である．当初は燃料や資源の高騰を背景とした欧州・アジア間輸送が拡大し，それが2014年に急減した後は，ロシア北極海沿岸の資源開発が駆動力となって，輸送貨物量は増大傾向にある．夏期北極海では海氷減少が進行中で，船舶の航行環境は緩和しつつあり，近年は多様な船が夏の北極海港航路を航行する様になってきた．北極海航路の輸送距離短縮により，燃料費や船体償却が低減され，ロシアの砕氷船料金などのコスト増を相殺する効果が出る．これにより，バルク貨物は輸送コスト削減が実現しやすい．当面はロシア北極海沿岸での天然資源開発に関連するバルク貨物が，北極海航路の主要貨物となって，海上輸送が拡大していくと考えられる．
  • OTSUKA Natsuhiko, IZUMIYAMA Koh, NAGAKAWA Keisuke, IMAI Katsuya
    Proceedings of the International Symposium on Okhotsk Sea & Sea Ice 31st 151 - 154 2016年02月 [査読無し][通常論文]
  • OTSUKA Natsuhiko, IMAI Katsuya, NAGAKAWA Keisuke, FURUICHI Masahiko
    Proceedings of the International Symposium on Okhotsk Sea & Sea Ice 31st 53 - 56 2016年02月 [査読無し][通常論文]
  • 古市 正彦, 大塚 夏彦
    運輸政策研究 19 1 2 - 13 一般財団法人 運輸総合研究所 2016年 [査読有り][通常論文]
     
    <p>従来のスエズ運河航路（Suez Canal Route: SCR）輸送に比べて約40％の航路距離短縮効果が期待できる北極海航路（Northern Sea Route: NSR）輸送の実用化に向けた機運が国際物流の大動脈（東アジア～欧州間）において高まってきている．2010年以降，北極圏で産出された天然資源を中心にNSR商業輸送量は急伸している．一方で，スケジュール運航と定時性が求められるコンテナ輸送においては，気象・海象条件によって航行が不安定になりがちなNSR輸送にはSCR輸送の補完航路としての期待が大きい．著者らが行ったコンテナ輸送のケース・スタディでは，夏季のNSR通航可能期間はNSRを通航し，冬季には従来通りSCRを通航するNSR・SCR組合せ輸送費用は，NSR通航可能期間を年間105日から225日間と想定した場合で8,000TEU級から15,000TEU級のコンテナ船によるSCR輸送費用に匹敵することが明らかになっている．一方で，さらなる規模の経済効果が期待できる20,000TEU級の超大型コンテナ船が2013年以降SCR輸送に投入されたことにより，NSR・SCR組合せコンテナ輸送のSCR輸送に対する相対的な競争力が低下してきている．本研究は，コンテナ船の超大型化がNSR・SCR組合せコンテナ輸送の競争力に及ぼす影響について分析，評価するものである．</p>
  • 森下裕士, 舘山一孝, 大塚夏彦
    寒地技術論文・報告集(CD-ROM) 32 ROMBUNNO.I‐014 - 73 北海道開発技術センター 2016年 [査読無し][通常論文]
  • Masahiko Furuichi, Natsuhiko Otsuka
    MARITIME ECONOMICS & LOGISTICS 17 1 9 - 31 2015年03月 [査読有り][通常論文]
     
    Maritime trade between East Asia and Northwest Europe using the Northern Sea Route (NSR) has been recently increasing, because ship operators may take advantage of the shorter sailing distance of NSR whose navigable season has become longer because of retreating Arctic sea ice. As Arctic sea ice continues to retreat because of global warming, the NSR is now approximately 40 per cent shorter than the Suez Canal Route (SCR) for such trade. In 2013, shipping on the NSR marked a record 10 year-high volume of 1.36 million tons with 71 voyages. Accordingly, comparative analyses of estimated shipping cost via the NSR and the alternative conventional routes, especially the SCR, have been carried out. Furthermore, NSR/SCR-combined shipping, that is, when a vessel transits the NSR during the warmer months and the SCR in the colder months, has already been proposed as a realistic scenario for Arctic shipping in the previous studies. Since assumptions used in the cost estimations vary among the studies, as discussed by Lasserre, there remain some difficulties when comparing estimated shipping costs. This study aims at establishing a common platform of a wide range of cost estimation assumptions, through clarifying and analysing the cost components contained in the current literature. In addition, interviews with NSR shipping professionals were conducted concerning the NSR fee on an unofficial basis, since typically such fees are determined based on negotiations between ice breaker escort service provider and shipping company. An empirical analysis revealed that NSR/SCR-combined shipping of container cargo between East Asia and Northwest Europe can be commercially feasible.
  • NAGAKAWA Keisuke, OTSUKA Natsuhiko, SATO Shun, YAMAGUCHI Takashi, MIYATA Keisuke, TSUZUKI Tatsuya, NAKAMURA Tomoya, FUKUUMA Tomoki
    Proceedings of the International Symposium on Okhotsk Sea & Sea Ice 30th 163 - 166 2015年02月 [査読無し][通常論文]
  • OTSUKA Natsuhiko, MORISHITA Hiroshi, TATEYAMA Kazutaka, IZUMIYAMA Koh
    Proceedings of the International Symposium on Okhotsk Sea & Sea Ice 30th 171 - 173 2015年02月 [査読無し][通常論文]
  • OTSUKA Natsuhiko, NAGAKAWA Keisuke, ITO Ryo, IWASAKI Kohei, NAKASHIO Yuko, ARAOKA Kenji, ODAGIRI Takuya, SAITO Kota
    Proceedings of the International Symposium on Okhotsk Sea & Sea Ice 30th 159 - 162 2015年02月 [査読無し][通常論文]
  • NAKANO Yuya, OTSUKA Natsuhiko, SUMIDA Tomoki, MORI Toshihiko, KOENUMA Toshiya, SHIOTSUBO Katsuya, UDA Ryuichi, MAEOKA Koki
    Proceedings of the International Symposium on Okhotsk Sea & Sea Ice 29th 213 - 217 2014年02月 [査読無し][通常論文]
  • OTSUKA Natsuhiko, NAKANO Yuya, ADACHI Yuta, IKI Sakumi, KAMIKO Yuka, KAEWNGERN Santamol, HOSHI Mayuna, YAMASHITA Kohei
    Proceedings of the International Symposium on Okhotsk Sea & Sea Ice 29th 218 - 222 2014年02月 [査読無し][通常論文]
  • 大塚 夏彦, 古市 正彦, 泉山 耕, 中野 佑哉
    土木学会論文集B3（海洋開発） 70 2 151 - 156 Japan Society of Civil Engineers 2014年 [査読有り][通常論文]
     
    北極海航路を用いて北極圏で産出される鉄鉱石及びLNGの我が国への輸送コストについて検討した．鉄鉱石・LNGそれぞれについて，北極海航路による輸送シナリオのほか，既存産地からの輸送シナリオを検討し，輸送コストを算出した．鉄鉱石の輸送コストでは，燃料費が最も大きな割合を占めた．北極海航路輸送では，距離短縮と航行速度低下によって燃料消費量が削減され，砕氷船支援料等のコスト増分を相殺した．LNG輸送コストでは，減価償却費が大きな割合を占めた．北極海航路の場合，航行日数が削減されて，高額な船価に起因する減価償却費増分が相殺された．以上より，北極圏で算出される天然資源を北極海航路で輸送する場合，輸送コストは，競合する既往産地からの輸送コストに対して競争力を持ちうることを示した．
  • OTSUKA Natsuhiko, IZUMIYAMA Koh, FURUICHI Masahiko, KOBAYASHI Wataru
    Proceedings of the International Symposium on Okhotsk Sea & Sea Ice 28th 166 - 169 2013年02月 [査読無し][通常論文]
  • 大塚 夏彦, 泉山 耕
    寒地技術論文・報告集 寒地技術シンポジウム 29 259 - 263 北海道開発技術センター 2013年 [査読無し][通常論文]
  • 山崎浩之, 後藤佑介, 三浦均也, 大塚夏彦, 小浪岳治
    港湾空港技術研究所資料 1258 21P - 19 港湾空港技術研究所 2012年09月 [査読無し][通常論文]
  • IZUMIYAMA Koh, OTSUKA Natsuhiko, TATEYAMA Kazutaka
    Proceedings of the International Symposium on Okhotsk Sea & Sea Ice 27th 61 - 64 2012年02月 [査読無し][通常論文]
  • OTSUKA Natsuhiko, IZUMIYAMA Koh, SHIBATA Hiroki, FURUICHI Masahiko
    Proceedings of the International Symposium on Okhotsk Sea & Sea Ice 27th 113 - 116 2012年02月 [査読無し][通常論文]
  • 大塚夏彦, 泉山耕, 古市正彦
    寒地技術論文・報告集(CD-ROM) 27 ROMBUNNO.I-020  2011年 [査読無し][通常論文]
  • OTSUKA Natsuhiko, IZUMIYAMA Koh
    Proceedings of the International Symposium on Okhotsk Sea & Sea Ice 26th 89 - 92 2011年 [査読無し][通常論文]
  • 三浦均也, 森政信吾, 大塚夏彦, 山崎浩之, 小浪岳治
    土木学会論文集 B2(海岸工学) 66 1,Pt.2 851 - 855 Japan Society of Civil Engineers 2010年10月 [査読有り][通常論文]
     
    The seabed stability is usually discussed from the viewpoint of scouring in coastal engineering, while it is evaluated from the viewpoint of liquefaction in geotechnical engineering. In fact, both scouring and liquefaction must occur and lead to the seabed destabilization. Moreover their effects can complement each other. The purpose of this study is to analyze the combined effect of flow velocity, which causes scour, and water pressure change, which causes liquefaction, on the wave-induced seabed destabilization. The correlation between water flow velocity and the fluctuation of vertical effective stress in the seabed due to water pressure change is examined in both linear waves and a non-linear wave considering the effect of the nearby structures. It was found that water pressure change enhances the scouring irrespective of wave types.
  • 大部哲哉, 三浦均也, 森政信吾, 浜田裕樹, 大塚夏彦, 山崎浩之, 小浪岳治
    地盤工学研究発表会発表講演集 45th 1 859 - 860 2010年07月15日 [査読無し][通常論文]
  • 経塚雄策, 水谷法美, 森屋陽一, 木村克俊, 大塚夏彦
    海洋開発論文集 25 29 - 32 2009年06月22日 [査読有り][通常論文]
  • 三浦均也, 森政信吾, 浅原信吾, 内倉勇介, 山崎浩之, 大塚夏彦, 小浪岳治
    中部地盤工学シンポジウム論文集(Web) 21st 143‐150 (WEB ONLY)  2009年 [査読無し][通常論文]
  • OTSUKA Natsuhiko, ITO Masaki, TAKAHASHI Shinjiro, SAEKI Hiroshi
    Proceedings of the International Symposium on Okhotsk Sea & Sea Ice 23rd 114 - 117 2008年 [査読無し][通常論文]
  • Shingo Asahara, Kinya Miura, Natsuhiko Otsuka, Junya Tanaka
    PROCEEDINGS OF THE EIGHTEENTH (2008) INTERNATIONAL OFFSHORE AND POLAR ENGINEERING CONFERENCE, VOL 2 475 - + 2008年 [査読有り][通常論文]
     
    The purpose of this study is to propose a stabilization method for seabed subjected to sea wave loading and verify the efficiency of the method through a FEM analysis. The principle of the stabilization method proposed in the study is the suppression of the seepage force inside the seabed. Since the seepage force is a kind of body force and is fundamentally related to the gradient of potential water head in the seabed, the unification of potential water can be effective for reducing the hydraulic gradient and the associated seepage force. In the method permeable columns which are installed into seabed near structures with a certain interval and depth are utilized for propagating water pressure from the surface to the inside of seabed.
  • Kinya Miura, Shingo Asahara, Natsuhiko Otsuka, Junya Tanaka
    PROCEEDINGS OF THE EIGHTEENTH (2008) INTERNATIONAL OFFSHORE AND POLAR ENGINEERING CONFERENCE, VOL 2 483 - + 2008年 [査読有り][通常論文]
     
    The response of seabed to sea wave loading was observed in New Ishikari Gulf Port, Hokkaido, Japan. We developed the observation rod, which is equipped with pore water pressure cells and earth pressure cells. Two observation rods were installed vertically near a sand groin located east side of the port; one of the two observation rods was surrounded by permeable columns installed vertically. The fluctuating pore water pressure and horizontal total earth pressure in the seabed were thus monitored at different levels of depth. The purpose of the field observation is to examine; (1) a method for estimating the response parameters of seabed to sea wave loading, (2) the effect of permeable column method for stabilizing seabed. The method of the observation is described and the observation results are analyzed to discuss the response behavior of the seabed.
  • 伊東雅規, 大塚夏彦, 高橋伸次郎
    寒地技術論文・報告集 23 455 - 458 2007年12月 [査読無し][通常論文]
  • 浅原信吾, 三浦均也, 大塚夏彦, 田中隼矢
    海岸工学論文集 54 2 966 - 970 Japan Society of Civil Engineers 2007年10月 [査読有り][通常論文]
     
    The purpose of the study is to propose a stabilization method for seabed subjected to sea wave loading through a series of FEM analyses. The suppression of the wave load is one of the most effective measures to stabilize the seabed, and breakwaters are often applied to reduce the wave impact. Our proposal for the stabilization is the suppression not of the water pressure itself, but of seepage force in the seabed. The seepage force is a kind of body force induced by the gradient of potential water head in the seabed. Thus the unification of potential water head must be effective for the stabilization of seabed. In the method proposed in this paper, the permeable columns are installed in seabed to propagate the water pressure applied to the seabedsurface into the seabed. The efficiency of the method proposed was examined by means of 3-D FEM analysis.
  • 大塚 夏彦, 佐々木 邦昭, 石川 清
    海洋開発論文集 23 691 - 696 Japan Society of Civil Engineers 2007年06月 [査読有り][通常論文]
     
    In the winter of 2006, Panaman cargo ship "Outsailing" had run aground on the Southwestern Coast of the Hokkaido Island and heavy fuel oil had spilled into seawater. The spilled oil had spread along the coast and polluted the shoreline which was consisted of pebbles and granules. This paper aims to describe the characteristics of oil pollution in the coast and transition of oil contaminated sediments on this accident.
  • 浅原信吾, 三浦均也, 大塚夏彦, 田中隼矢
    中部地盤工学シンポジウム論文集 19th 121 - 130 2007年 [査読無し][通常論文]
  • OTSUKA Natsuhiko, ISHIKAWA Ryou, SAEKI Hiroshi
    Proceedings of the International Symposium on Okhotsk Sea & Sea Ice 22nd 85 - 88 2007年 [査読無し][通常論文]
  • Shingo Asahara, Kinya Miura, Natsuhiko Otsuka, Katsutoshi Ueno, Toshiyuki Takahara
    PROCEEDINGS OF THE SEVENTEENTH (2007) INTERNATIONAL OFFSHORE AND POLAR ENGINEERING CONFERENCE, VOL 1- 4, PROCEEDINGS 1688 - + 2007年 [査読有り][通常論文]
     
    This study aims to investigate the proper mathematical formulation of soil materials for the analysis of the transient response behavior of seabed subjected to sea wave loading. Since soil is multi-phase material, the exact formulation of the mechanical behavior of soil is usually quite complicated and requires a large amount of calculation effort. Although soil materials generally are three-phase materials which consist of solid, fluid and gas phases, i.e., soil particles, pore water, and air, they are simplified in practical analyses, and modeled as single phase or binary-phase materials. Also the analytical calculation is often conducted in static or quasi-dynamic conditions even for the dynamic problems. We have to select the appropriate procedure of modeling and calculation of soil materials taking account of the mechanical condition and target feature of the problems to be analyzed. Four variations of the formulations are selected in this study;: u-w-p, u-p, u- and w-p models. And the applicability of the models is comparatively examined for the coupled response analysis of the seabed to sea wave loading.
  • 今村 文彦, 富田 孝史, 水谷 法美, 森屋 陽一, 木村 克俊, 大塚 夏彦
    海洋開発論文集 22 69 - 72 Japan Society of Civil Engineers 2006年06月26日 [査読無し][通常論文]
     
    This paper summarizes the special session "Coastal Disaster Prevention -- Rehabilitation and Disaster Preventing City Against Tsunamis--. " This session has been planned to understand the tsunami disasters and there rehabilitations. Presentations include the experiences in Okushiri Island which had severe damages in the 1993 Hokkaido Nanseioki Earthquake Tsunami and the 2004 Indian Ocean Tsunami. Also, countermeasures against huge tsunami disaster have been introduced by Miyagi Prefecture and Ministry of Land, Infrastructure and Transportations. After presentations, the countermeasures against tsunami disasters have been discussed. Throughout the presentations and discussions, many important issues have been pointed out.
  • 三浦均也, 渡邊潤平, 小濱英司, 大塚夏彦, 窪内篤
    日本地震工学シンポジウム論文集(CD-ROM) 12th ROMBUNNO.0138  2006年 [査読無し][通常論文]
  • 泉山耕, 金田茂雄, 大塚夏彦
    寒地技術論文・報告集 21 374 - 381 2005年12月 [査読無し][通常論文]
  • 大塚夏彦, 近藤浩文, 米田克幸, 佐伯浩
    寒地技術論文・報告集 21 382 - 389 2005年12月 [査読無し][通常論文]
  • OTSUKA Natsuhiko, HAMADA Seiichi, TAKAHASHI Shinjiro, KONDO Hirofumi, ISHIKAWA Ryou, SAEKI Hiroshi
    Proceedings of the International Symposium on Okhotsk Sea & Sea Ice 20th 201 - 206 2005年02月 [査読無し][通常論文]
  • Koh Izumiyama, Shigeo Kanada, Shotaro Uto, Natsuhiko Otsuka
    Proceedings of the International Conference on Port and Ocean Engineering under Arctic Conditions, POAC 2 863 - 872 2005年01月01日 [査読有り][通常論文]
     
    A study was made to develop an oil recovery unit in ice. The oil recovery in the unit is based on a concept to use air bubbles to separate oil from ice. Series of laboratory tests were performed to show the unit works effectively in various ice conditions.
  • 近藤 浩文, 石川 亮, 大塚 夏彦, 佐伯 浩
    海洋開発論文集 21 1077 - 1082 Japan Society of Civil Engineers 2005年 [査読有り][通常論文]
     
    If an oil spill occurs under pack ice fields in the ocean, oil would spread beneath the ice cover and then trapped into recesses under pack ice. In this paper the method for separating oil that trapped into recesses beneath the pack ice is investigated. In this method, it is proposed to remove oils from recesses by introducing air bubbles and flush out by relative velocity between ice and seawater. In order to create relative velocity between ice and seawater, authors are proposing ice booming to control ice movement. A series of experiments for separating oil, which trapped into recesses of model ice, were carried out by using water tank. From the experimental results, the behavior of oil and air bubbles was investigated.
  • 高橋喜一, 後藤克人, 宇佐美宣拓, 大塚夏彦, 寺島貴志, 佐伯浩
    海洋工学シンポジウム講演論文集(CD-ROM) 18th OES-50  2005年 [査読無し][通常論文]
  • 今村 文彦, 富田 孝史, 水谷 法美, 森屋 洋一, 木村 克俊, 大塚 夏彦
    海洋開発論文集 21 95 - 98 Japan Society of Civil Engineers 2005年 [査読有り][通常論文]
     
    This paper summarizes the special session "Coastal Disaster Prevention -for huge earthquakes and tsunami hazards-." This session has been planned to understand the tsunami hazards and current status of countermeasures, simulation technique, measuring system and international network system. In the session, details of each topic have been presented. After presentations, discussions on the countermeasures against tsunami hazards have been done. In the discussions, safety of residents was one of the main topics. Also importance of education for disaster prevention and provision of adequate information have been pointed out.
  • KONDO Hirofumi, OTSUKA Natsuhiko, ISHIKAWA Ryou, SAEKI Hiroshi
    Proceedings of the International Symposium on Okhotsk Sea & Sea Ice 20th 187 - 192 2005年 [査読無し][通常論文]
  • 三浦均也, 浅原信吾, 大塚夏彦, 上野勝利
    地盤工学シンポジウム論文集 49th 233 - 240 2004年11月11日 [査読無し][通常論文]
  • 近藤浩文, 石川亮, 大塚夏彦, 佐伯浩
    寒地技術論文・報告集 20 346 - 353 2004年10月 [査読無し][通常論文]
  • 高橋喜一, 上原泰正, 関野高志, 後藤克人, 大塚夏彦
    寒地技術論文・報告集 20 574 - 576 2004年10月 [査読無し][通常論文]
  • 近藤 浩文, 石川 亮, 米田 克幸, 大塚 夏彦, 佐伯 浩
    海洋開発論文集 20 1253 - 1258 Japan Society of Civil Engineers 2004年 [査読有り][通常論文]
     
    In the Nahotokha oil spill, the use of a crane bucket was found to an effective method for recovering the oil under low temperature and rough sea. However, a system for separating oil from water that is also collected in the bucket is needed for this recovery method. This paper describes the system for separating oil and water that uses conduit with a semi-circular cross section that has drainage holes in the bottom. Experiments were carried out under the conditions of unsteady flow. From the experimental results, design parameters of the system were discussed.
  • 水谷 法美, 森屋 陽一, 大塚 夏彦
    海洋開発論文集 20 57 - 59 Japan Society of Civil Engineers 2004年 [査読有り][通常論文]
     
    This paper summarizes the special session "Application of Recent Numerical Simulation Models to Engineering Design-from wave forecast to wave resistive design-." This session has been planned to understand the latest numerical simulation models which are employed in engineering design of coastal and offshore project in a variety of the design stages from wave forecast to wave resistive design. In the session, details of the models have been presented as well as their application results. After each presentation, discussions have been done. In the discussions, the advantages and disadvantages in each model have been discussed. As far as the flow model is concerned, the numerical simulation in wave field remains many rooms for improvement. Moreover, important attentions in employing the numerical models have been explained in the discussions.
  • 千葉 仁, 中内 勲, 中野 克彦, 松本 浩史, 先川 光弘, 大塚 夏彦
    海洋開発論文集 20 143 - 148 Japan Society of Civil Engineers 2004年 [査読有り][通常論文]
     
    In the early morning of Sep. 26, a huge earthquake, which named "2003 Tokachi-oki earthquake" had stricken to the eastern coast of Hokkaido Island. This earthquake caused serious damage to roads, dikes, lifelines as well as harbor facilities. The significant damage of quay walls was found in the wharf No.4 in the western port of Kushiro. This paper aims to examine the process of seismic damage which occur to the gravity type quay walls of the wharf No.4 in the western port of Kushiro. Field survey to measure the deformation of gravel backfill behind concrete caisson and numerical simulation of seismic response on the damaged quay walls were conducted. And the causal factor and process of seismic damage to quay walls were discussed.
  • KONDO Hirofumi, ISHIKAWA Ryou, OTSUKA Natsuhiko, SAEKI Hiroshi
    Proceedings of the International Symposium on Okhotsk Sea & Sea Ice 19th 230 - 236 2004年 [査読無し][通常論文]
  • IZUMIYAMA Koh, KANADA Shigeo, OTSUKA Natsuhiko
    Proceedings of the International Symposium on Okhotsk Sea & Sea Ice 19th 103 - 110 2004年 [査読無し][通常論文]
  • OTSUKA Natsuhiko, IZUMIYAMA Koh, SAKAI Shigeki, KONDO Hirofumi, ISHIKAWA Ryo, SAEKI Hiroshi
    Proceedings of the International Symposium on Okhotsk Sea & Sea Ice 19th 97 - 102 2004年 [査読無し][通常論文]
  • 大塚夏彦, 佐藤典之, 高橋喜一, 柴田俊夫, 宇佐美宣拓, 寺島貴志, 佐伯浩
    寒地技術論文・報告集 19 339 - 344 2003年11月 [査読無し][通常論文]
  • 大塚夏彦, 金編康平, 近藤浩文, 石川亮, 米田克幸, 佐伯浩
    寒地技術論文・報告集 19 406 - 411 2003年11月 [査読無し][通常論文]
  • 金編康平, 近藤浩文, 大塚夏彦, 米田克幸, 柿崎裕太, 佐伯浩
    寒地技術論文・報告集 19 399 - 405 2003年11月 [査読無し][通常論文]
  • 高椅喜一, 宇佐美宣拓, 柴田俊夫, 大塚夏彦, 寺島貴志, 佐伯浩
    寒地技術論文・報告集 19 345 - 352 2003年11月 [査読無し][通常論文]
  • K Miura, N Otsuka, E Kohama, C Supachawarote, T Hirabayashi
    SOILS AND FOUNDATIONS 43 5 133 - 147 2003年10月 [査読有り][通常論文]
     
    This paper aims to reveal the size effect of earth pressure cells on measurements in sand and gravels and propose a guideline for the selection of an appropriate size. In the case of gravel containing large particles, point loadings at several contact points in the cell make it difficult to measure the earth pressure with sufficient accuracy and reliability. Four types of earth pressure cells were used in this study with different sizes of sensitive panels and principles of measurements. A series of loading tests were conducted with sand and four types of gravels. The reliability of the test results was first examined; the influence of parameters such as the stiffness of the earth pressure cell, and the sidewall friction of the test container were investigated. From a comparative study of the measured data, the appropriate size of the earth pressure cell was determined as a function of the grain size of the gravel and accuracy needed in the measurements.
  • 高橋喜一, 宇佐美宣拓, 柴田俊夫, 大塚夏彦, 寺島貴志, 佐伯浩
    日本沿岸域学会論文集 15 89 - 100 2003年03月 [査読有り][通常論文]
  • 金編 康平, 近藤 浩文, 大塚 夏彦, 佐伯 浩
    海洋開発論文集 19 827 - 832 Japan Society of Civil Engineers 2003年 [査読有り][通常論文]
     
    In the oil recovery operation of Nakhodka oil spill, recovered oil was temporary stored in the storage pit that excavated on the backland of quay wall. In the case of using the temporary oil storage pit, the oil contamination of sandy ground was to be considered. In this paper, a series of experiments on permeability coefficient of sand against oil, capillary height of oil against sand and 2-dimensional oil distribution into sand were carried out. And characteristics of oil permeation into sand were discussed.
  • 高橋 喜一, 柴田 俊夫, 宇佐美 宣拓, 寺島 貴志, 大塚 夏彦, 佐伯 浩
    海洋開発論文集 19 619 - 624 Japan Society of Civil Engineers 2003年 [査読有り][通常論文]
     
    The Ishikari Bay New Port is located at a distance of 15km from the central partof Sapporo City, which is largest consumer market in Hokkaido. The favorable location, together with the fully arranged port facilities and road network, provide a lot of benefits to business activities. On the other hand, the region of Ishikari River has many peoples, many factories, and so on, and is the main part of Hokkaido.<BR>In this paper, we discuss the benefit of reductions for transportation and distribution costs by shifting thetransportation route from roads to Ishikari River.
  • 笹島 隆彦, 先川 光弘, 橋詰 知喜, 大塚 夏彦, 三浦 均也, 小濱 英司
    海洋開発論文集 19 695 - 700 Japan Society of Civil Engineers 2003年 [査読有り][通常論文]
     
    In this study, close examination about the safety factors of gravity type quay walls that had been stricken by strong earthquake motion during two big earthquakes that occurred in Hokkaido Island, "1993 Kushiro-oki" and "1994 Hokkaido Toho-oki" earthquakes, was conducted. And the characteristics on the seismic earth pressure were discussed based on the extent of damage and seismic forces estimated by the seismic coefficient method.
  • 金編 康平, 近藤 浩文, 大塚 夏彦, 米田 克幸, 柿崎 裕太, 佐伯 浩
    海洋開発論文集 19 809 - 814 Japan Society of Civil Engineers 2003年 [査読有り][通常論文]
     
    A series of experiments for separating oil which trapped under cavities of model ice floes were carried out by using water tank. In the experiment air bubbles were injected beneath the model ice with water flow. And the method for separating oil from ice floes by injecting air bubbles and by using relative velocity between oil and water, in the case of oil spill accident under ice floes, was discussed.
  • 関本 恒浩, 大塚 夏彦, 森屋 陽一
    海洋開発論文集 19 133 - 136 Japan Society of Civil Engineers 2003年 [査読無し][通常論文]
     
    Long-period wave problem is selected as the theme of the special session on the design and the construction of maritimes tructures. Firstly, the basic properties of the long-period waves, such as the generation and propagation of long-period waves, the engineering problems on those and the countermeasures against the long-period wave problem, and its reflection on the design maritime structure at present are lectured. The panel discussion for the reflection of long-period waves on the design of maritime structures was opened. The practical problems in the design stage and the direction of the future research on the long-period waves were discussed.
  • 高橋 喜一, 宇佐美 宣拓, 柴田 俊夫, 大塚 夏彦, 寺島 貴志, 佐伯 浩
    海洋開発論文集 19 785 - 790 Japan Society of Civil Engineers 2003年 [査読有り][通常論文]
     
    Inland navigation had played a key role for physical distribution in earlier times. As railway androad had developed, however, inland navigation had declined. Recently, inland navigation draw renewed attentions from the aspects of reduce of physical distribution cost and global environmental problem.<BR>Ishikari River is located in cold region and it is known that the water is frozen in winter season. So the measurements for the ice problem are needed on the facility of inland navigation.<BR>In this study, some measures of ice problem for locks are considered.
  • 小浜英司, 三浦均也, 井上清敬, 大塚夏彦, 笹島隆彦, 佐藤謙司
    地盤工学シンポジウム論文集 47th 179 - 186 2002年11月07日 [査読無し][通常論文]
  • 高橋喜一, 宇佐見宣拓, 柴田俊夫, 大塚夏彦, 寺島貴志, 佐伯浩
    寒地技術論文・報告集 18 146 - 152 2002年11月 [査読無し][通常論文]
  • 大塚夏彦, 高橋喜一, 柴田俊夫, 宇佐美宣拓, 寺島貴志, 佐伯浩
    寒地技術論文・報告集 18 153 - 160 2002年11月 [査読無し][通常論文]
  • 高橋喜一, 柴田俊夫, 寺島貴志, 大塚夏彦, 佐伯浩
    寒地技術論文・報告集 18 161 - 166 2002年11月 [査読無し][通常論文]
  • 高橋喜一, 宇佐美宣拓, 柴田俊夫, 大塚夏彦, 寺島貴志, 佐伯浩
    寒地技術論文・報告集 18 130 - 137 2002年11月 [査読無し][通常論文]
  • 金編康平, 高橋伸次郎, 米田克幸, 大塚夏彦, 荻原浩二, 近藤浩文, 佐伯浩
    寒地技術論文・報告集 18 454 - 458 2002年11月 [査読無し][通常論文]
  • 佐藤典之, 大塚夏彦, 金編康平, 佐伯浩
    寒地技術論文・報告集 18 449 - 453 2002年11月 [査読無し][通常論文]
  • 佐伯浩, 大塚夏彦, 堺茂樹, 泉山耕, 山本泰司
    寒地技術論文・報告集 18 459 - 466 2002年11月 [査読無し][通常論文]
  • 金編康平, 高橋伸次郎, 米田克幸, 大塚夏彦, 荻原浩二, 近藤浩文, 佐伯浩
    寒地技術論文・報告集 18 467 - 472 2002年11月 [査読無し][通常論文]
  • 高橋喜一, 柴田俊夫, 宇佐美宣拓, 大塚夏彦, 寺島貴志, 佐伯浩
    寒地技術論文・報告集 18 679 - 684 2002年11月 [査読無し][通常論文]
  • 大塚夏彦, 荻原浩二, 金編康平, 高橋伸次郎, 佐伯浩
    海洋開発論文集 18 767 - 772 Japan Society of Civil Engineers 2002年 [査読有り][通常論文]
     
    In the Sea of Okhotsk, crude oil production had started in the summer of 1999, on the northeastern shelf of Sakhalin Island. And crude oil was exported by oil tanker from July to November because of ice foes in the winter season. However, it is planed to continue the production of crude oil through the year by sub sea pipelines. This development increases the risk of oil spill accident in the ice-covered waters.<BR>In this paper, experimental study is presented in order to investigate the behavior of crude oil spreading among pack ice. The experiments were carried out including model pack ice consist of the board of circular ice, and some cases of different discharge, volume conditions and ice concentrations.
  • 笹島隆彦, 梅沢信敏, 三浦均也, 大塚夏彦, 菅野高弘
    海洋開発論文集 18 611 - 616 Japan Society of Civil Engineers 2002年 [査読有り][通常論文]
     
    The project for the field observation of the behavior of quay walls at West District of Kushiro Port, Hokkaido, Japan is introduced. Two caissons with the same dimensin were prepared and the backfill ground of the one was treated with sand compaction piles against liquefaction; the backfill ground of the other was not treated. Accelerometers, velocitimeters, pore water pressure cells, and earth pressure cells were installed for the observation of the behavior of the quay walls, that is the caisonns and backfill grounds. It is planed that the behavior of the quay walls during construction process and earthquake vibrations are observed with special attention to the effect of liquefaction of backfill ground.<BR>In this paper the test site of this project and the outline of the observation system are introduced. And a result of a verification test on the system of measurement is presented.
  • 佐藤成, 亀山和弘, 大塚夏彦, 森浩章, 小堤治, 井合進, 安田進
    地盤工学シンポジウム論文集 46th 25 - 30 2001年11月21日 [査読無し][通常論文]
  • 荻原浩二, 大塚夏彦, 米田克幸, 高橋伸次郎, 金編康平, 佐伯浩
    寒地技術論文・報告集 17 322 - 328 2001年11月 [査読無し][通常論文]
  • 金編康平, 大塚夏彦, 荻原浩二, 佐藤典之, 佐伯浩
    寒地技術論文・報告集 17 329 - 333 2001年11月 [査読無し][通常論文]
  • 佐藤 成, 大竹 省吾, 亀山 和弘, 佐藤 靖彦, 飯田 典生, 大塚 夏彦, 土屋 善浩, 森 浩章, 小堤 治, 井合 進, 安田 進
    地震工学研究発表会講演論文集 26 677 - 680 Japan Society of Civil Engineers 2001年 [査読無し][通常論文]
     
    非排水条件での有効応力地震応答解析 (FLIP) において, 捨石材はc=0, φ'<SUB>f</SUB>=40° とし, 水の体積弾性係数K<SUB>f</SUB>=2.2×10<SUP>6</SUP> (kPa) とするモデル化が広く行われてきた. 本検討では, ケーソン岸壁の捨石材に着目した想定モデルを対象に地震応答解析を行い, 排水および非排水条件の初期の振動特性を比較した. その結果, 水の体積弾性係数K<SUB>f</SUB>がゼロに近い値をとれば排水条件と同等になることを確認した. また, 捨石材における水の体積弾性係数Kfを小さくするだけではなく, 室内試験で確認されているc=20 (kPa), φ'<SUP>f</SUP>=35° の設定を行わないと, ケーソン周辺で局部的に破壊領域に至り, ケーソンの残留変位が大きくなることが明らかとなった.
  • 佐藤 成, 林 家祥, 亀山 和弘, 佐藤 靖彦, 飯田 典生, 大塚 夏彦, 土屋 善浩, 森 浩章, 小堤 治, 井合 進, 安田 進
    地震工学研究発表会講演論文集 26 681 - 684 Japan Society of Civil Engineers 2001年 [査読無し][通常論文]
     
    前報 (その1) で明らかとなった結果を基に水の体積弾性係数K<SUB>f</SUB>とc, φ'fを設定し, 兵庫県南部地震における六甲アイランドRF3岸壁および神戸港第七防波堤, 釧路沖地震における北釧路港岸壁の各被災断面を対象に地震応答解析を行い, 被災後の観測結果との比較を行うことで評価を行った. その結果, c=20(kPa), φ'<SUB>f</SUB>=35(°), K<SUB>f</SUB>≒0(kPa) で基礎捨石および裏込石をモデル化することにより, ケ-ソンの残留変位量は, より観測値に適合する結果が得られ, その妥当性が確認された.
  • 大塚夏彦, 荻原浩二, 金編康平, 高橋伸次郎, 佐伯浩
    海洋開発論文集 17 105 - 110 Japan Society of Civil Engineers 2001年 [査読有り][通常論文]
     
    In the Nahotokha oil spill, which occurred in the Japan Sea in the winter of 1997, recovery operations using buckets hauled up by crane barges and grab dredgers showed good results. It was thought that this method would be more useful than other oil recovery methods for the recovery of high viscosity oil because crane barges and grab dredgers can operate even in rough sea, and crane buckets have proven to be effective for the recovery of oil of high viscosity. However, one drawback of this method is that a huge volume of water is collected together with the oil. A large storage pit and an efficient method for treating the polluted water are therefore needed. Thus, for effective utilization of the bucket recovery method, a method for separating oil and water and increasing the oil/water ratio is needed. Experiments were conducted in the present study to find an effective method for separating oil from seawater recovered using buckets in a low-temperature such as the Okhotsk Sea in winter.
  • 大塚夏彦, 荻原浩二, 金編康平, 高橋伸次郎, 佐伯浩
    海洋開発論文集 17 595 - 600 Japan Society of Civil Engineers 2001年 [査読有り][通常論文]
     
    If an oil spill were to occur under the sea in the winter drift ice season, the spilled oil would spread along the lower surface of the ice. In this case the spilled oil is thought to gradually settle in the cavities and gaps under ice sheets. Accordingly, the recovery of spilled oil becomes very difficult. However, the oil can be separated from those cavities by introducing an air layer between the oil and the ice floe. But these gaps between ice floes are usually thin and weak. This paper examines a characteristics of air layer which formed under the lower surface of the gaps of ice floes. The experiments on bearing capacity of ice between gaps of ice floes against the pressure of air layer and characteristics on heat transfer of ice and air layer were conducted. The experiments showed that the ice between gaps of ice floes could be stable against air pressure, and the air layer insulated the heat transfer through ice and saline so that growth of ice would be prevented.
  • 荻原浩二, 金編康平, 大塚夏彦, 高橋伸次郎, 佐伯浩
    海洋開発論文集 17 589 - 594 Japan Society of Civil Engineers 2001年 [査読有り][通常論文]
     
    In connection with crude-oil production of Sakhalin shelf, studies on behavior of spilled oil in icy seawater. In experiments used crude oil, it is hard to keep on invariable conditions because crude oil viscosities are influenced by temperature and evaporation on oil is proceeding rapidly in the air. In addition, it is dangerous to use crude oil due to its toxicity and inflammable in the components of evaporation. Thus, in the experiments on the behavior of oil spreading under ice floes and recovery method for spilled oil is included in variable constrained conditions.<BR>In this paper, alternative materials of crude oil and ice sheet for experiments were selected by digging the interface between ice sheet and crude oil, so that the experiment method of recovery method for spilled oiland thebehavior of oil spreading can be carried out systematically and safety.
  • 大塚夏彦, 荻原浩二, 金編靖平, 佐伯浩, 米田克幸
    寒地技術論文・報告集 16 38 - 42 2000年11月 [査読無し][通常論文]
  • 高橋伸次郎, 米田克幸, 大塚夏彦, 宇佐美宣拓, 荻原浩二, 佐伯浩
    寒地技術論文・報告集 16 43 - 47 2000年11月 [査読無し][通常論文]
  • 荻原浩二, 大塚夏彦
    寒地技術論文・報告集 16 48 - 53 2000年11月 [査読無し][通常論文]
  • 大塚夏彦, 宇佐美宣拓, 荻原浩二, 多田英彦, 佐伯浩
    日本沿岸域学会論文集 12 93 - 103 2000年03月 [査読有り][通常論文]
  • 高橋伸次郎, 吉田稔, 大塚夏彦, 宇佐美宣拓, 荻原浩二, 佐伯浩
    海洋開発論文集 16 129 - 133 Japan Society of Civil Engineers 2000年 [査読有り][通常論文]
     
    There are currently several offshore oil and natural gas drilling projects being carried out in the Sea of Okhotsk. Therefore there has been increased the possibility of the ocean pollution of the coastal areas of Hokkaido on both the Japan Sea and Okhotsk Sea sides. Oil spilled from the oil tanker Nakhodka was recovered using buckets lowered from grab dredgers and self-propelled grab barges. This method of oil recovery was effective, but one problem was the large volume of sea water collected in buckets together with the oil. To resolve this problem, the authors developed a new type bucket with many holes in the bottom. The principle of the recovery method is to utilize difference in viscosity. This paper reports the recovery method for spilled oil by using newly developed buckets.
  • 宇佐美宣拓, 大塚夏彦, 荻原浩二, 米田克幸, 佐伯浩
    海洋開発論文集 16 123 - 128 Japan Society of Civil Engineers 2000年 [査読有り][通常論文]
     
    There are currently offshore oil and natural gas drilling projects being carried out in the Sea of Okhotsk near the northern part of Sakhalin. Following a small-scale oil spill that occurred soon after oil production started due to a detached hose on the oil deserving tanker, there has been an increased awareness of the risk of a major oil spill affecting the coastal areas of Hokkaido on both the Japan Sea and Okhotsk Sea sides. The recovery of spilled oil in the sea is greatly affected by weather conditions, sea condition and the viscosity of the oil. Authors have developed a new efficient method for the recovery of spilled oil, and basic experiments were carried out in this study to test the effectiveness of this method.
  • 大塚夏彦, 宇佐美宜拓, 荻原浩二, 高橋伸次郎, 佐伯浩
    海洋開発論文集 16 175 - 180 Japan Society of Civil Engineers 2000年 [査読有り][通常論文]
     
    Development of oil and natural gas deposits off Sakhalin's northern coast in the Sea of Okhotsk is currently under way. An accident involving a spill of crude oil or other effluents during the current development of the oil and natural gas deposits off the eastern coast of northern Sakhalin could be expected to affect the environment and economy of the Hokkaido's Okhotsk and Pacific coast. This paper describes a recovery method for spilled oil under a pack ice field established through a systematic experiment.
  • 三浦均也, 大塚夏彦, 小浜英司, 井上清敬, 笹島隆彦, 林忠志, 吉田望
    地盤工学シンポジウム論文集 44th 365 - 370 1999年11月17日 [査読無し][通常論文]
  • 大塚夏彦, 宇佐美宣拓, 多田英彦, 中谷智明, 高橋伸次郎, 佐伯浩
    寒地技術論文・報告集 15 445 - 450 1999年11月 [査読無し][通常論文]
  • 高橋伸次郎, 米田克幸, 大島香織, 大塚夏彦, 宇佐美宣拓, 荻原浩二, 佐伯浩
    寒地技術論文・報告集 15 451 - 456 1999年11月 [査読無し][通常論文]
  • 三浦 均也, 大塚 夏彦, 笹島 隆彦, 小濱 英司
    土と基礎 47 6 25 - 28 公益社団法人地盤工学会 1999年06月01日 [査読有り][通常論文]
  • 大塚夏彦, 大島香織, 宇佐美宣拓, 高橋伸次郎, 佐伯浩
    日本沿岸域学会論文集 11 85 - 94 1999年03月 [査読有り][通常論文]
  • Toni Iijima, Yasuhisa Sato, Hideo Kondo, Natsuhiko Otsuka
    American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP 389 121 - 127 1999年 
    These days, S.F.T (Submerged Floating Tunnel). will be discussed about marine development in several countries especially Japan and Norway. In this paper, we researched for the unsteady fluid lift force on S.F.T. modeled by circular cylinder caused by vortex and developed air spouting type actuator for reduction of this unsteady fluid lift force. We testified reasonable ability of reducing lift force of vertical supported cylinder subjected cross flow to use air spouting type actuator experimentally. We can observe that this actuator reduce more than half of lift force of u̇ at St. ≒ 0.20 by some parameters (air spouting fraction, non-dimensioned velocity, osculation ratio).
  • Toru Iijima, Fumikazu Taniguchi, Hideo Kondo, Yasuhisa Sato, Natsuhiko Otsuka
    American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP 389 129 - 135 1999年 
    Nowadays, in Northern Europe, Japan, and USA, many researches have been presented about S.F.T. (Submerged Floating Tunnel) adapting for coastal and Fjords traffic systems. However, the natural frequency of S.F.T. is below a few Hz we must consider about the fluid force. We proposed the air spouting type actuator to reduce fluid force of S.F.T.'s main body subjected sinusoidal oscillating flow. We testified effects of the control system for reducing fluid force acting on S.F.T. to measure CD, CM, and CL, experimentally. We found that this actuator reduce fluid force effectively at some parameters.
  • 飯島徹, 佐藤靖尚, 近藤ひで郎, 大塚夏彦
    海洋開発論文集 15 393 - 396 Japan Society of Civil Engineers 1999年 [査読有り][通常論文]
     
    Nowadays, there are many research reports about submerged floating tunnel (S. F. T.). In this paper, we examined the vibration response of floating tunnel supported by tention legs. We measured angle response and vibration response of the test model of S. F. T. subjected cross flow using by parameters reduced velocity and reduced angle displacement.<BR>From that, we can observed the flatter vibration coupled between angle response and lift motion of S. F. T. and discuss about the mechanism of flattervibration, subjected steady flow, caused by rotating vibration of ballast container mode and some amplitude (3 degrees).
  • 大島香織, 大塚夏彦, 石川博基, 宇佐美宣拓, 米田克幸, 佐伯浩
    海洋開発論文集 15 565 - 570 Japan Society of Civil Engineers 1999年 [査読有り][通常論文]
     
    The fate of spilled oil in sea area is governed by complex interrelated physico-chemical processes that depend on the oil properties, hydrodynamic conditions and environmental conditions. Evaporation begins immediately after spill, and it is the main process which caused the loss in oil volume and the increases in viscosity and density during weathering. It is very important to select the recovery method to clarify the change in viscosity and density of spilled crude oil. In this paper, the authors describe the process of characteristic change of spilled oil, and newly developed simplified measurement technique of viscosity.
  • 高橋伸次郎, 米田克幸, 大島香織, 大塚夏彦, 佐伯浩
    海洋開発論文集 15 553 - 557 Japan Society of Civil Engineers 1999年 [査読有り][通常論文]
     
    In January 1997, the oil tanker "Nakhodka" spilled about 6, 200 kl of heavy oil into Japan Sea. The spilled oil was followed by mechanical and chemical techniques. Usually, physical properties of spilled oil change rapidly due to the hydrodynamic and environmental conditions, and its viscosity increases quickly. Finally, spilled oil becomes high viscosity substance such as mousse. In case of Nakhodka, mechanical recovery methods such as dredger, vacuum track and concrete placer showed good results in recovering of high viscosity oil. This paper reports the experimental results on more effective recovery method through systematic experiments.
  • 大島 香織, 大塚 夏彦, 石川 博基, 高橋 伸次郎, 渡部 靖憲, 橘 治国, 佐伯 浩
    海洋開発論文集 15 15 559 - 564 公益社団法人 土木学会 1999年 [査読有り][通常論文]
     
    Development of oil and gas deposits off Sakhalin's northern coast in the sea of Okhotsk are currently under way.An accident involving a spill of crude oil could be expected to affectthe environment and economy of the Hokkaido's Okhotsk coast.If the oil spill occurred in winter season due to the accidents of pipeline, oil tanker and oil rigs, spilled oil would be trapped under the ice floes. If the operation for recovery of spilled oil will be late, spilled oil under the ice floes will be trapped in the ice sheet. In this paper the authors report the behavior of spilled oil trapped under ice sheet and the permeation of spilled oil into ice sheet.
  • 大塚夏彦, 大島香織, 宇佐見宣拓, 多田英彦, 米田克幸, 高橋伸次郎, 佐伯浩
    海洋開発論文集 15 547 - 552 Japan Society of Civil Engineers 1999年 [査読有り][通常論文]
     
    Development of oil and natural gas deposits are currently under way at the northeastern coast of Sakhalin. In the early stage of this project, it is planed to transport crude oil by surface tanker. But it is well known that the major spills in the ocean were caused by tanker incident.<BR>In this paper, the simulation of oil spreading and drifting with the scenario of oil spill from the tanker at the Soya Straits was conducted. Based on this simulation, it is pointed out that the coast of Soya Bay could be polluted by crude oil spill, and the heavy impacts for fisheries of the coast of Hokkaido should occur. To reduce the impact of oil spill, some requirements for oil-combating plan was discussed.
  • 飯島 徹, 佐藤 靖尚, 近藤 俶郎, 大塚 夏彦
    日本機械学会論文集 C編 65 636 3116 - 3121 The Japan Society of Mechanical Engineers 1999年 [査読有り][通常論文]
     
    In these days, there are many reports about marine development in several countries especially Japan and Norway. In this paper, we researched for the unsteady fluid lift force on S.F.T modeled by circular cylinder caused by vortex and examined air spouting type actuator for reduction of this unsteady fluid lift force. We can recognize that this actuator has ability to reduce (C<SUB>ln</SUB>) at some parameters (void fraction, oscillation ratio, non-dimensioned velocity, oscillation frequency, spouting patterns) but made C<SUB>dn</SUB> increased. So that, we propose the most appropriate parameters to reduce C<SUB>ln</SUB> and increased C<SUB>dn</SUB> at minimum experimentally.
  • 飯島 徹, 谷口 史一, 近藤 俶郎, 大塚 夏彦, 黒島 利一, 佐藤 靖尚
    日本機械学会論文集 C編 65 636 3090 - 3095 The Japan Society of Mechanical Engineers 1999年 [査読無し][通常論文]
     
    Nowadays, in Northern Europe, Japan, and USA, many researches have been presented about S. F.T. (Submerged Floating Tunnel) adapting for coastal and Fjords traffic systems. But the natural frequency of S.F.T. is below a few Hz because of three types support conditions that are tension-leg type, piling, and floating support type subjected steady and sinusoidal oscillating flow. So they said that we must consider about the fluid force. In this paper, we proposed the air spouting type actuator to reduce fluid force of S.F.T's main body subjected to sinusoidal oscillating flow. We testified effects of the control system for reducing fluid force acting on S.F.T. to measure C<SUB>D</SUB>, C<SUB>M</SUB>, C<SUB>L</SUB>., and phase angle between displacement and force experimentally. We found that this actuator reduce fluid force effectively at some parameters (Air Spouting Fraction, K. C., spouting pattern).
  • 小濱 英司, 三浦 均也, 吉田 望, 大塚 夏彦, 栗田 悟
    土と基礎 47 1 67 - 67 公益社団法人地盤工学会 1999年01月01日 [査読有り][通常論文]
  • 飯島 徹, 谷口 史一, 近藤 俶郎, 大塚 夏彦, 黒島 利一, 佐藤 靖尚
    日本機械学會論文集. C編 65 636 3090 - 3095 一般社団法人日本機械学会 1999年 [査読有り][通常論文]
     
    Nowadays, in Northern Europe, Japan, and USA, many researches have been presented about S. F.T. (Submerged Floating Tunnel) adapting for coastal and Fjords traffic systems. But the natural frequency of S.F.T. is below a few Hz because of three types support conditions that are tension-leg type, piling, and floating support type subjected steady and sinusoidal oscillating flow. So they said that we must consider about the fluid force. In this paper, we proposed the air spouting type actuator to reduce fluid force of S.F.T's main body subjected to sinusoidal oscillating flow. We testified effects of the control system for reducing fluid force acting on S.F.T. to measure C_D, C_M, C_L., and phase angle between displacement and force experimentally. We found that this actuator reduce fluid force effectively at some parameters (Air Spouting Fraction, K. C., spouting pattern).
  • 大島香織, 大塚夏彦, 宇佐美宣拓, 高橋伸次郎, 河合邦広, 佐伯浩
    寒地技術論文・報告集 14 333 - 339 1998年12月 [査読無し][通常論文]
  • 大塚夏彦, 大島香織, 石川博基, 宇佐美宣拓, 渡部靖憲, 佐伯浩
    寒地技術論文・報告集 14 326 - 332 1998年12月 [査読無し][通常論文]
  • 飯島徹, 近藤ひで郎, 佐藤靖尚, 大塚夏彦
    海岸工学論文集 45 2 726 - 730 Japan Society of Civil Engineers 1998年10月 [査読有り][通常論文]
  • 飯島徹, 佐藤靖尚, 近藤ひで郎, 大塚夏彦
    日本機械学会機械力学・計測制御部門講演会論文集 1998 A 677 - 680 1998年08月 [査読有り][通常論文]
  • 飯島徹, 佐藤靖尚, 近藤ひで郎, 大塚夏彦, 黒島利一
    日本機械学会機械力学・計測制御部門講演会論文集 1998 A 673 - 676 1998年08月 [査読有り][通常論文]
  • 飯島徹, 近藤ひで郎, 佐藤靖尚, 大塚夏彦
    土木学会北海道支部論文報告集 54B(1997) 282 - 287 1998年02月 [査読無し][通常論文]
  • 飯島徹, 近藤ひで郎, 佐藤靖尚, 大塚夏彦
    土木学会北海道支部論文報告集 54B(1997) 276 - 281 1998年02月 [査読無し][通常論文]
  • 北原繁志, 佐々木秀郎, 桑原伸司, 松山恵二, 大塚夏彦, 谷野賢二
    土木学会北海道支部論文報告集 54B(1997) 304 - 309 1998年02月 [査読無し][通常論文]
  • 大島香織, 宇佐美宣拓, 高橋伸次郎, 川合邦広, 大塚夏彦, 渡部靖憲, 佐伯浩
    海洋開発論文集 14 14 435 - 439 Japan Society of Civil Engineers 1998年 [査読有り][通常論文]
     
    Development of oil and natural gas deposits off Sakhalin's northern coast on the Sea of Okhotsk are currently under way. Should an accident involving a spill of crude oil or other effluents occur during the development of the oil and natural gas deposits that is currently under way off the eastern coast of northern Sakhalin, it can be expected to have an impact on the environment and economy of the Hokkaido's Okhotsk Sea and Pacific Ocean coast. This paper describes the recovery method for spilled oil under ice floes through the systematic experiments.
  • 得永道彦, 林倫史, 片桐政司, 高橋伸次郎, 大島香織, 大塚夏彦, 佐伯浩
    海洋開発論文集 14 465 - 470 Japan Society of Civil Engineers 1998年 [査読有り][通常論文]
     
    According to Koblov (1977) and others of the Sakhalin Oil and Gas Research Institute, underground deposits of oil and natural gas in the Russian Far East stretch from the east and west coasts of Sakhalin and the area offshore of Magadan to the west coast of the Kamchatka peninsula and to the Bering Sea. Should an accident involving a spill of crude oil or other effluents occur during the development of the oil and natural gas deposits that is currently under way off the eastern coast of northern Sakhalin, it can be expected to have an impact on the environment and economy of the Hokkaido's Okhotsk Sea and Pacific Ocean coast. This report describes these concerns about the environmental and economical impacts on Hokkaido's coastal areas from problems that may occur from the development of Sakhalin's offshore oil and natural gas.
  • 飯島徹, 近藤ひで郎, 佐藤靖尚, 大塚夏彦
    海洋開発論文集 14 329 - 332 Japan Society of Civil Engineers 1998年 [査読有り][通常論文]
     
    These days, SFT will be discussed about marine development in several countries especially Japan and Norway. In this paper, we researched for the unsteady fluid lift forc e on SFT modeled by circular cylinder caused by vortex and developed air spouting type a ctuator for reduction of this unsteady fluid lift force. We can reconize that this actu ator has ability to reduce (Cl) at some parameters (void fraction, oscillation ratio, mechanical St. number, oscillation frequancy, spouting patterns) but made Cd increased. So tha t, we propose the most appropriate parameters to reduce Cl and increased Cd at minimu m experimentaly.
  • Eiji Kohama, Kinya Miura, Nozomu Yoshida, Natsuhiko Ohtsuka, Satoru Kurita
    Soils and Foundations 38 4 71 - 83 1998年 [査読有り][通常論文]
     
    The mechanism of the damage to a gravity type quay wall caused by liquefaction of the backfill ground during an earthquake is made clear through a shaking table test and theoretical examination. A series of model shaking table tests was conducted focusing on the occurrence of liquefaction in the backfill ground. The movement of the caisson is found to be quite different depending on whether liquefaction occurred in the backfill ground or not. The fluctuating earth pressure on the caisson suppresses the movement of the caisson when liquefaction does not occur. On the other hand, sliding of the caisson is enhanced since the fluctuating component of earth pressure and the inertial force coincide in phase angle when liquefaction occurs in the backfill ground. When liquefaction occurs, observed earth pressure agrees with that evaluated by Westergaard's formula originally derived for the water pressure on the dam. The fluctuating earth pressure acting on the back wall of the caisson in the process to liquefaction was carefully observed in the model shaking tests. It was found that the amplitude of the earth pressure first decreased to a very small value because of the reduction of the stiffness of the backfill due to the excess pore water pressure generation, and then increased because the phase angle of the earth pressure changed 180 degrees. This indicates that stability criteria of the caisson should be developed not by the onset of the liquefaction but by the sudden phase change. This feature is demonstrated by the simplified mass-spring-dashpot model proposed by the authors.
  • 三浦 均也, 小濱 英司, 栗田 悟, 大塚 夏彦
    土と基礎 45 8 17 - 20 公益社団法人地盤工学会 1997年08月01日 [査読有り][通常論文]
  • 飯島徹, 近藤ひで郎, 大塚夏彦, 大島修
    海洋開発論文集 13 907 - 912 Japan Society of Civil Engineers 1997年 [査読有り][通常論文]
     
    These days, SFT will be discussed about marine development in several countriesespecially Japan and Norway. In this paper, we researched for the unsteady fluid lift force on SFT caused by vortices and developed flip-flop type actuator for reduction of this unsteadyfluid lift force estimated by measurement of unsteady fluid force and movement of separatingpoints on the surface of SFT used by parameters: St. rotating angle, rotating frequency, andoscillation frequency.
  • 桑原伸司, 松山恵二, 北原繁志, 大塚夏彦, 谷野賢二
    海洋開発論文集 13 285 - 290 Japan Society of Civil Engineers 1997年 [査読有り][通常論文]
     
    In recently, we realize that the problem of marine resources and environment has been engaged actively. In Marine Civil Engineering, new technology for the "algae reproducing structures" which enable marine life reproduction is under developing. In the process of this tecnology developing, we are now researching the numerical model which forecasts algae growth under the variable environmental and structures location factors in the ocean. This numerical model definitively needs the quantification of the algae reproduction and environmental factors. In this study, we analyze the data to clarify the relation between algae growth and trailing factors which has been our marine purpose on this field but never been clarified.
  • 飯島徹, 近藤ひで郎, 大塚夏彦, 佐藤靖尚
    海洋開発論文集 13 913 - 918 Japan Society of Civil Engineers 1997年 [査読有り][通常論文]
     
    Recently we have to spread traffic system in the background of expansion ofcommunity to local area. It is useful to develop S. F. T from a view of effectiveusing of ocean space.In this paper, we suggest air spouting type actuator toreduce the unsteady fluid force of S. F. T subjected cross flow.<BR>We researched for unsteady characteristic fluid force of S. F. T and the effectof this actuator by using parameters, void rate, oscillation rate, St. number, oscillaition frequency.
  • 平野誠治, 和田忠幸, 田中輝未, 大塚夏彦
    海洋開発論文集 13 405 - 410 Japan Society of Civil Engineers 1997年 [査読有り][通常論文]
     
    Stress acting on deformed bars and concrete used for lifting and foundation of a - 14-m quaywall slit caisson was measured at Hakodate Port, to determine the characteristics of inequality coefficient and current states of stress distribution for lifting bars. At the same time, structural analysis of the caisson at the time of lifting was conducted using a threedimensional FEM model. The stress distribution properties of the lifting bars and caisson members were then examined. Strength of each part of the caisson was verified and design methods of reinforcing bars were also examined.
  • 大塚夏彦, 栗田悟, 笹島隆彦, 宮部秀一, 三浦均也
    海洋開発論文集 13 49 - 54 Japan Society of Civil Engineers 1997年 [査読有り][通常論文]
     
    During the recent big earthquakes in Japan, significant damage was caused in the port and harbor facilities, especially in reclaimed lands. The survey was extensively carried out on the damages during the recent three big earthquakes in Hokkaido Island; i.e., 1993 Kushiro-oki, 1993 Hokkaido Nansei-oki, and 1994 Hokkaido Toho-oki Earthquakes. And the damages were closely examined based on the current seismic design code for quay wall. As a result, it is clarified that the occurrence and the intensity of the damage are strongly correlated to the occurrence of the liquefaction in the backfill grand.
  • 中内勲, 恋塚貴, 大塚夏彦, 木村統久, 福原功樹
    寒地技術論文・報告集 12 1 153 - 160 1996年11月 [査読無し][通常論文]
  • 正木 孝治, 本田 秀樹, 河合 孝治, 大塚 夏彦, 黒木 幹男, 佐伯 浩
    海洋開発論文集 12 361 - 366 Japan Society of Civil Engineers 1996年 [査読有り][通常論文]
     
    Uniaxial compressive Strength is one of the main parameters, which determines the valueof load on marine structures in ice-infested sea area. Sea ice has defferent properties bymaritime and weather condition, and strength of natural sea ice has much dispersion, becauseit depends on a number of factors (ice temperature, salinity, structure, etc.). therefore, it isnessesary for the exploitation in Okhotsk Sea to estimate the appricabitity of formula andfactor influencing on uniaxial compressive strength of sea ice in Okhotsk Sea.
  • 林忠志, 恋塚貴, 大塚夏彦, 木村統久
    海洋開発論文集 11 163 - 168 Japan Society of Civil Engineers 1995年 [査読有り][通常論文]
  • 堺茂樹, 大塚夏彦, 佐伯 浩, 尾崎晃
    海岸工学講演会論文集 28th 138 - 142 Japan Society of Civil Engineers 1981年11月 [査読有り][通常論文]

書籍

  • “Вечная мерзлота и культура, —Глобальное потепление и Республика Саха (Якутия), Российская Федерация—, (Учебное пособие для экологического образования) (Teaching Materials for Environmental Education: Permafrost and Indigenous/Northern Societies in Arctic
    Natsuhiko Otsuka (担当:分担執筆)
    Hiroki Takakura edited. 2019年12月
  • 南極・北極から学ぶ地球環境変動
    大塚夏彦 (担当:分担執筆範囲:第3章 北極海航路の利用)
    公財）日本極地研究振興会 2019年04月 48
  • これからの北極
    大塚夏彦 (範囲:第2章第一節、北極海航路へのインパクト)
    北極域研究推進プロジェクト事務局編集・発行 2019年 56 19-26
  • 一帯一路からユーラシア新世紀の道、進藤榮一・周 瑋生・一帯一路日本研究センター編
    大塚夏彦 (担当:分担執筆範囲:第12章 氷上シルクロードの展開)
    日本評論社 2018年12月 (ISBN: 9784535559332) 230 90-97
  • Russia's Far North
    大塚夏彦 (担当:分担執筆範囲:Northern Sea Route (NSR) shipping, current status and feasibility)
    Routledge 2018年 251 43-63
  • ・ 難関攻略 技術士第二次試験「建設部門」、中田光治・青山芳之共編
    大塚夏彦 (担当:分担執筆)
    オーム社 2007年05月 (ISBN: 9784274204128)
  • 人とわざわい－持続的幸福へのメッセージ、下巻
    大塚夏彦 (担当:分担執筆範囲:4.4 油流出被害の生態系に及ぼす影響)
    株式会社エス・ビー・ビー 2006年09月 (ISBN: 9784893292049) 558
  • New Era in Far East Russia & Asia
    大塚夏彦 (担当:分担執筆範囲:pp.69-86, 123-133.)
    海洋政策研究財団 2006年02月 (ISBN: 4884041690) 318
  • 村上 隆, 荒井 信雄, 皆川 修吾, 畠山 武道, 中尾 繁, 吉田 文和, 青田 昌秋, 北川 弘光, 山村 悦夫, 佐伯 浩, 大塚 夏彦, 濱田 誠一, Akaha Tsuneo, Vassilieva Anna, 井上 紘一 
    北海道大学図書刊行会 2003年 (ISBN: 4832963716)

講演・口頭発表等

  • Commercial and navigational feasibility of the Northern Sea Route  [通常講演]
    Natsuhiko Otsuka
    Arctic Circle 2019. Smart and Connected Arctic Engineering – The Key to a Better Life in the Cold 2019年10月 口頭発表（一般）
  • Japan’s story for study and business of the Northern Sea Route  [通常講演]
    Natsuhiko Otsuka
    Arctic Circle 2019, Breakout Session, Science meets Society: toward the co-designing of Arctic Research 2019年10月 口頭発表（一般）
  • Step forward to the new Arctic research through transdisciplinary cooperation  [通常講演]
    Natsuhiko Otsuka
    North Pacific Arctic Research Community Meeting 2019 2019年09月 口頭発表（一般）
  • Japan’s Arctic Policy and observer status of the Arctic Council  [通常講演]
    Natsuhiko Otsuka
    North Pacific Arctic Conference 2019 2019年08月 口頭発表（一般）
  • Perspective of Future Arctic  [通常講演]
    Natsuhiko Otsuka
    International Seminar on Arctic Shipping~Follow up of AMSA and Future 2019年02月 口頭発表（基調）
  • Future Arctic Logistics, Intra-regional transport in the East Siberia  [通常講演]
    Natsuhiko Otsuka
    Arctic Frontiers 2019, Breakout session: Future Arctic Logistics and Infrastructure 2019年01月 口頭発表（一般）
  • Challenge to the Arctic container shipping, scenario of vessel operation  [招待講演]
    Natsuhiko Otsuka
    The 7th International Arctic Shipping Seminar 2018 2018年12月 口頭発表（一般）
  • Cargo Base for the NSR  [通常講演]
    Natsuhiko Otsuka
    Arctic Circle 2018, “A Polar Silk Road” at the Intersection of Research, Policy and Industry, organized by CHNL and CNARC 2018年10月 口頭発表（一般）
  • The Northern Sea Route and its Socio-Economic Effects  [通常講演]
    Natsuhiko Otsuka
    Arctic Circle 2018, ARCTIC DECADES AHEAD Organized by ArCS (Arctic Challenge for Sustainability) 2018年10月 口頭発表（一般）
  • Arctic LNG development and logistics, Japan’s perspective?  [通常講演]
    Natsuhiko Otsuka
    2018 North Pacific Arctic Conference ~Arctic 2030 and Beyond – Pathways to the Future 2018年08月 口頭発表（一般）
  • Key factors for utilization of the Northern Sea Route  [通常講演]
    Natsuhiko Otsuka
    North Pacific Arctic Research Community Meeting 2018 2018年06月 口頭発表（一般）
  • Perspective of Shipping Activity Along the Northern Sea Route  [通常講演]
    Natsuhiko Otsuka
    ICES/PICES/PAME WGICA workshop 2018年03月 口頭発表（一般）
  • Assessment of Shipping Activity in the Arctic Ocean  [通常講演]
    Natsuhiko Otsuka
    PICES WG 39 worksho 2018年03月 口頭発表（一般）
  • Study on the Arctic Shipping  [通常講演]
    Natsuhiko Otsuka
    Hokkaido University Umea Seminar 2018年03月 口頭発表（一般）
  • Study toward sustainable Arctic Shipping  [通常講演]
    Natsuhiko Otsuka
    International Seminar ~ Multidisciplinary collaboration of industry-academia-government Toward Sustainable Use of the Arctic 2018年02月 口頭発表（一般）
  • Investigation of Liner Shipping Operations via the NSR  [通常講演]
    Natsuhiko Otsuka
    Research on Integrated Logistic Networks in the Arctic、 organized by Hokkaido Univ. Arctic Research Center and Nord Univ. 2018年01月 口頭発表（一般）
  • Navigable speed related to ice condition along the Northern Sea Route  [通常講演]
    Natsuhiko Otsuka
    ISAR-5/Fifth International Symposium on Arctic Research 2018年01月 口頭発表（一般）
  • Challenge to the Arctic Container Shipping  [通常講演]
    Natsuhiko Otsuka
    Hokkaido University Arctic Research Center and J-Arc Net Special Seminar on Arctic Research Today and Future 2017年12月 口頭発表（一般）
  • Sustainable Arctic shipping toward the field of SDGs  [通常講演]
    Natsuhiko Otsuka
    Hokkaido University Arctic Research Center and J-Arc Net Special Seminar on Arctic Research Today and Future 2017年12月 口頭発表（一般）
  • How sea ice science can progress safe navigation along the NSR  [通常講演]
    Natsuhiko Otsuka
    Arctic Partnership Week 2017 ~ New Challenges and Opportunities for Arctic Cooperation 2017年12月 口頭発表（一般）
  • Possibility and issues of liner shipping via the Northern Sea Route  [通常講演]
    Natsuhiko Otsuka
    Arctic Circle 2017, Breakout Session “Northern Sea Route – Impact on Global Trade” 2017年10月 口頭発表（一般）
  • Navigability and economic feasibility of Arctic shipping  [通常講演]
    Natsuhiko Otsuka
    Arctic Circle 2017 Breakout Session “THE ARCTIC AS THE FIELD OF SDGS” 2017年10月 口頭発表（一般）
  • Perspectives on the Northern Sea Route by Japanese maritime parties  [通常講演]
    Natsuhiko Otsuka
    2017 North Pacific Arctic Conference、Organized by the East West Center and the Korea Maritime Institute 2017年08月 口頭発表（一般）
  • Navigability of Northern Sea Route, estimated from satellite monitoring  [通常講演]
    Natsuhiko Otsuka
    JSPS/NORPAN Symposium ‘Past, present, and future of the Arctic and Antarctic’ 2017年06月 口頭発表（一般）
  • Navigability facts of the Northern Sea Route from recent activities  [通常講演]
    Natsuhiko Otsuka
    The Seventh Symposium on Polar Science 2016年12月 口頭発表（一般）
  • Northern Sea Route Today and Future: How Arctic Shipping Might Become Reality  [通常講演]
    Natsuhiko Otsuka
    Slavic-Eurasian Research Center 2016 Summer International Symposium “Russia’s Far North: The Contested Frontier,” 2016年07月 口頭発表（一般）
  • Sustainable Use of the Northern Sea Route; Research by ArCS  [通常講演]
    Natsuhiko Otsuka
    North Pacific Arctic Research Community 2016 Meeting 2016年07月 口頭発表（一般）

その他活動・業績

受賞

  • 2013年 国際海上物流経済学会 最優秀論文賞
     北極海航路と既往航路の輸送コスト分析 
    受賞者: 古市正彦;大塚夏彦

共同研究・競争的資金等の研究課題

  • 文部科学省：補助事業
    研究期間 : 2020年06月 -2025年03月
  • 文部科学省：補助事業
    研究期間 : 2015年09月 -2020年03月
  • 北極海航路による北海道・欧州間海上貨物輸送モデルの提案とその経済効果に関する研究
    一財 北海道開発協会：平成28年度研究助成
    研究期間 : 2016年04月 -2017年03月 
    代表者 : 大塚夏彦
  • 北極航路利用のための海氷予測および航行支援システムの構築
    文部科学省：グリーン・ネットワーク・オブ・エクセレンス(GRENE)事業 北極気候変動分野
    研究期間 : 2011年11月 -2016年03月 
    代表者 : 山口 一
  • 北極海航路活用による欧州と北海道間の新たな相互関係創出の可能性の検討
    日本港湾協会：平成26年度港湾関係研究奨励助成金
    研究期間 : 2014年09月 -2015年09月 
    代表者 : 田村 亨
  • The effects of the navigability of the Northern Sea Route and the Northwest Passage by the climate change
    国際港湾協会：IAPH Technical Committee Assistance Program
    研究期間 : 2011年07月 -2013年05月 
    代表者 : 古市正彦, 佐々木秀郎, 大塚夏彦, 田村亨
  • 透水性コラムを用いた港湾施設の波浪に対する安定化工法の開発
    鉄道・運輸機構：運輸分野における基礎的研究推進制度
    研究期間 : 2008年04月 -2011年03月 
    代表者 : 三浦均也
  • 氷海域における流出油の挙動と回収に関する基礎的研究
    運輸施設整備事業団：運輸分野における基礎的研究推進制度
    研究期間 : 2000年04月 -2003年03月 
    代表者 : 佐伯 浩

教育活動情報

主要な担当授業

  • 大学院共通授業科目（一般科目）：複合領域
    開講年度 : 2021年
    課程区分 : 修士課程
    開講学部 : 大学院共通科目
    キーワード : 北極域、地球環境、温暖化、気候変動、炭素循環、水循環、人間活動、永久凍土、北極域航路、国際政治、持続的開発 Arctic, Global environment, Global warming, Climate change, Ecosystems, Human activity, Permafrost, Northern Sea Route, Global politics, Sustainable development
  • 北極域総論
    開講年度 : 2021年
    課程区分 : 修士課程
    開講学部 : 環境科学院
    キーワード : 北極域、地球環境、温暖化、気候変動、炭素循環、水循環、人間活動、永久凍土、北極域航路、国際政治、持続的開発 Arctic, Global environment, Global warming, Climate change, Ecosystems, Human activity, Permafrost, Northern Sea Route, Global politics, Sustainable development
  • 大学院共通授業科目（教育プログラム）：RJE3
    開講年度 : 2021年
    課程区分 : 修士課程
    開講学部 : 大学院共通科目
    キーワード : 野外観測、タイガ、永久凍土、環境、文化
  • 専門横断科目（一般科目）：複合領域
    開講年度 : 2021年
    課程区分 : 学士課程
    開講学部 : 専門横断科目
    キーワード : 北極における海洋および陸域の環境、気候変動、国際関係、北極海航路、海底ケーブル
  • 一般教育演習(ﾌﾚｯｼｭﾏﾝｾﾐﾅｰ)
    開講年度 : 2021年
    課程区分 : 学士課程
    開講学部 : 全学教育
    キーワード : 北極域、地球環境、温暖化、気候変動、炭素循環、水循環、人間活動、永久凍土、北極域航路、国際政治

大学運営

委員歴

  • 2014年 - 現在   日本海洋政策学会   理事
  • 2009年06月 - 現在   Port and Ocean Engineering Under Arctic Conditions (POAC)   International Committee Member
  • 2003年04月 - 現在   公益社団法人土木学会   海洋開発委員会 委員兼幹事

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