研究者データベース

笠井 美青(カサイ ミオ)
農学研究院 基盤研究部門 森林科学分野
准教授

基本情報

所属

  • 農学研究院 基盤研究部門 森林科学分野

職名

  • 准教授

学位

  • PhD(Macquarie University)

J-Global ID

研究キーワード

  • 亀裂   連続性   流域スケールの土砂移動   崩壊危険度マップ   地表粗度   GIS解析   地すべり活動度   セデイメントバジェット   山地渓流   河床変動   Sediment wave   Recurence Interval   

研究分野

  • その他 / その他

職歴

  • 2016年07月 - 現在 東京大学 空間情報科学研究センター 客員准教授(拠点)
  • 2010年09月 - 現在 北海道大学 准教授
  • 2009年08月 - 2010年08月 Landcare Research Soils and Landscapes Visiting Scientist
  • 2006年07月 - 2009年06月 (独)土木研究所 研究員
  • 2005年10月 - 2005年12月 CSIRO Land and Water Rivers and Coasts Visiting Scientist
  • 2000年02月 - 2001年02月 Macquarie University Division of Environmental and Life Sciences Visiting Associate
  • 1997年 - 1999年 九州大学 農学部 助手

学歴

  • 2001年03月 - 2005年09月   Macquarie University   Division of Environmental and Life Sciences   Department of Physical Geography
  •         -   九州大学   農学部   林学科

所属学協会

  • Asia Oceania Geosciences Society   American Geophysical Union   European Geosciences Union   日本地球惑星科学連合   日本地形学連合   日本地すべり学会   砂防学会   

研究活動情報

論文

  • Shui Yamaguchi, Mio Kasai
    Transactions in GIS 26 1040 - 1061 2022年01月 [査読有り]
  • 平成28年8月豪雨による北海道戸蔦別川流域の流木実態と流木量の推定
    工藤拓也, 永野統宏, 松岡 暁, 早川智也, 上條孝徳, 松山洋平, 小山内信智, 笠井美青
    砂防学会誌 73 6 3 - 11 2021年03月 [査読有り]
  • Shui Yamaguchi, Mio Kasai
    Proceedings of GEOMORPHOMETRY 2020 Conference 166 - 169 2020年08月 [査読有り][通常論文]
     
    ISBN 978 88 8080 282 2
  • Michiya IRASAWA, Takashi KOI, Ching-Ying TSOU, Nobuaki KATO, Shinjiro MATSUO, Mizuho ARAI, Masahiro KAIBORI, Takashi YAMADA, Mio KASAI, Taeko WAKAHARA, Daisuke HIGAKI, Hajime IKEDA, Yoshiharu ISHIKAWA, Kenichi ARAI, Shinji HIROSE, Tatsuya SATO, Hideki KAWATABATA, Manabu KOUBU, Satoshi NIWA, Kazuhiro SUGAWARA, Hiroyuki MATSUSAKA, Nobuyuki TADA
    International Journal of Erosion Control Engineering 13 2 48 - 55 2020年05月22日 [査読無し][通常論文]
  • 柳井 一希, 笠井 美青
    日本地すべり学会誌 57 3 90 - 98 2020年 [査読有り][通常論文]
  • 井良沢道也, 松尾新二朗, 新井瑞穂, 海堀正博, 鄒 青穎, 山田孝, 笠井美青, 厚井高志, 加藤誠章, 若原妙子, 檜垣大助, 池田一, 石川芳治, 荒井健一, 広瀬伸二, 佐藤達也, 川端秀樹, 講武学, 丹羽諭, 菅原和宏, 松坂裕之, 多田信之, 金俊之
    砂防学会誌 72 6 42 - 53 2020年 [査読有り][通常論文]
  • 金正賢, 浅野仁, 本間宏樹, 井上忠, 山田孝, 笠井美青, 南里智之, 丸谷知己
    砂防学会誌 72 3 4 - 10 2019年09月 [査読有り][通常論文]
  • Mio Kasai, Takashi Yamada
    Earth, Planets and Space 71 2019年08月 [査読有り][通常論文]
  • 地表粗度指標を用いた最適化ホットスポット分析による活動的な地すべり斜面の抽出
    笠井美青
    日本地すべり学会誌 56 3 15 - 23 2019年05月 [査読有り][通常論文]
  • 小山内 信智, 藤浪 武史, 村上 泰啓, 伊波 友生, 佐藤 創, 中田 康隆, 阿部 友幸, 大野 宏之, 武士 俊也, 田中 利昌, 小野田 敏, 海堀 正博, 本間 宏樹, 柳井 一希, 宮崎 知与, 上野 順也, 早川 智也, 須貝 昂平, 山田 孝, 笠井 美青, 林 真一郎, 桂 真也, 古市 剛久, 柳井 清治, 竹林 洋史
    砂防学会誌 71 5 54 - 65 公益社団法人 砂防学会 2019年 [査読有り][通常論文]
     

    On 6th September 2018, a large earthquake (the 2018 Hokkaido Eastern Iburi Earthquake) with the magnitude of 6.7 struck the eastern Iburi region, Hokkaido and triggered numerous landslides. The landslides were distributed densely over hilly areas (400 km2) in Atsuma, Abira, and Mukawa Town, the total area of which reached 13.4 km2. All landslides were shallow landslides except a large-scale deep-seated one generated in midstream area of the Hidaka-Horonai River. The area is covered by thick pyroclastic fall deposits derived from the Tarumae Volcano etc., and the strong seismic shock triggered shallow landsliding of them. Some shallow landslides occurred at a relatively gentle slope (<15°). Shallow landslides moving along a valley topography tended to travel longer than those moving along a non-valley topography. In catchments where shallow landslides densely occurred, the ratio of landslide area to the total catchment area was very large compared with past earthquake events, suggesting that the catchments became highly devastated. Based on these survey results, we propose viewpoints for preventing secondary disasters in the damaged area and for promoting countermeasures against and studies on earthquake-induced landslide disasters in volcanic regions.

  • 北海道のダム堆砂速度から見た流域スケールでの土砂生産量の変化
    丸谷知己, 黒木幹男, 笠井美青
    地形 40 1 93 - 104 2019年 [査読有り][通常論文]
  • Channel evolution controlled by valley configuration during 70 years in a severely erosive catchment: Mangaoporo River, New Zealand
    Kasai, M, Aoki, D, Peacock, D, Maturani, T
    Catena 174C 324 - 338 2019年 [査読有り][通常論文]
  • 周氷河性斜面の崩壊・侵食に起因する大規模な土砂移動の実態-2016年台風10号による北海道ペケレベツ川を例に-
    宮崎知与, 澤田雅代, 松岡直基, 立川義通, 高嶋繁則, 吉田安範, 林真一郎, 古市剛久, 笠井美青, 小山内信智
    砂防学会誌 71 2 22 - 33 2018年 [査読有り][通常論文]
  • A Method for Estimating Maximum Damage Caused by Sediment Disaster by Surveying with Artificial Satellite SAR Imagery
    Shin-ichiro HAYASHI, Shin?ya KATSURA, Mio KASAI, Nobutomo OSANAI, Takashi YAMADA, Tomomi MARUTANI, Tomoyuki NORO, Joko KAMIYAMA
    Interpraevent Band 1 401 - 407 2018年 [査読有り][通常論文]
  • A Study on Criteria of Warning and Evacuation for Large-scale Sediment Disasters Considering the Relationships with Sediment Movement and Damage
    Yuna SUZUKI, Shin-ichiro HAYASHI, Shinya KATSURA, Mio KASAI, Nobutomo OSANAI, Tomomi MARUTANI
    Interpraevent Band 1 387 - 393 2018年 [査読有り][通常論文]
  • The Effects of Hydraulic Structures on Streams Prone to Bank Erosion in an Intense Flood Event: A Case Study from Eastern Hokkaido
    Daisuke AOKI, Mio KASAI, Mari IGURA
    Interpraevent Band 1 270 - 275 2018年 [査読有り][通常論文]
  • Grain Size Distribution of the 1926 Volcanic Mudflow at Mt. Tokachi, Japan
    Tomoyuki NANRI, Takashi YAMADA, Mio KASAI, Tomomi MARUTANI, Shigenori TAKASHIMA, Takayuki YAMAHIRO
    Interpraevent Band 1 163 - 169 2018年 [査読有り][通常論文]
  • Geologic and Topographic Features of Slope Failure Sites in the Aso Caldera Wall Inducted by the 2016 Kumamoto Earthquake
    Haruka SAITOU, Shinya KATSURA, Ryota UMETANI, Mio KASAI, Tomomi MARUTANI
    Interpraevent Band 1 117 - 122 2018年 [査読有り][通常論文]
  • 清水収, 児玉龍朋, 笠井美青
    砂防学会誌 70 5 3 - 14 2018年 [査読有り][通常論文]
  • 小山内 信智, 笠井 美青, 林 真一郎, 桂 真也, 古市 剛久, 伊倉 万理, 高坂 宗昭, 藤浪 武史, 水垣 滋, 阿部 孝章, 布川 雅典, 吉井 厚志, 紅葉 克也, 渡邊 康玄, 塩野 康浩, 宮崎 知与, 澤田 雅代, 早川 智也, 松岡 暁, 佐伯 哲朗, 稲葉 千秋, 永田 直己, 松岡 直基, 井上 涼子
    新砂防 = Journal of the Japan Society of Erosion Control Engineering : 砂防学会誌 69 6 80 - 91 砂防学会 2017年03月 [査読有り][通常論文]
     
    災害報告
  • 被害が広域に及ぶ大規模な土砂災害に対する調査技術の活用事例に基づく定量的分析
    林真一郎, 内田太郎, 桂真也, 笠井美青, 小山内信智, 丸谷知己
    日本地すべり学会誌 54 2 18 - 25 2017年03月 [査読有り][通常論文]
  • 南里智之, 山田孝, 笠井美青, 丸谷知己
    砂防学会誌 69 1 12 - 19 公益社団法人 砂防学会 2016年 [査読有り][通常論文]
     

    In 1926 a volcanic mudflow triggered by the eruption of Mt. Tokachi, named "Taisho mudflow", ran through the Furano River in Hokkaido and caused destructive damage along the course. Several disaster maps presenting the path have been produced since then, while additional information of the arrival time and the levels of damage on the map was considered helpful to establish evacuation plans for the future eruption. In this study, the travelling time of the flow was estimated by interviewing locals who experienced the disaster (Nanri et al., 2004). The damage level was also classified into three groups, High (Ⅰ) : 90% of houses were completely destroyed and 30% of residents were killed, Moderate (Ⅱ) : 30-90% of houses were completely destroyed and 10-30% of residents were killed, and Low (Ⅲ) : houses were partly destroyed and less than 10% of residents were killed. Estimating fluid dynamic force produced by the flow, more than 103 KN/m for the level Ⅰ, 102-103 KN/m for the level Ⅱ, and 101-102 KN/m for the level Ⅲ were required during the travel respectively. Applying the relationship between average river bed slope and the force given, the distribution of the damage level was estimated and demonstrated through the path. In summary, it took the flow 20 minutes to travel from the crater through the valley to 0.5 km downstream of the outlet after the eruption, giving a high level of damage. Subsequently, another 10 minutes were required to travel over a flood plain as damaging the area to a moderate degree. Finally, after 40 minutes from the eruption the flow arrived at the Kami-Furano Township, as yielding a low degree of damage.

  • パイプハイドロフォンの音響波形に及ぼす境界条件の影響
    後藤健, 伊藤隆郭, 長山孝彦, 笠井美青, 丸谷知己
    砂防学会誌 68 4 3 - 11 2015年 [査読有り][通常論文]
  • Tectonic and volcanic forcing on fluvial systems: two case studies from Japan
    Parkner, T, Kasai, M
    Past Global Changes Magazine 22 1 36 - 37 2014年 [査読無し][通常論文]
  • GOTO Ken, ITOH Takahiro, NAGAYAMA Takahiko, KASAI Mio, MARUTANI Tomomi
    International Journal of Erosion Control Engineering 7 4 101 - 110 Japan Society of Erosion Control Engineering 2014年 [査読有り][通常論文]
     
    A Japanese pipe hydrophone is an acoustic sensor that is widely used in Japan to measure bedload transport. Here we report experimental and theoretical tools for calculating bedload transport using a Japanese pipe hydrophone, and discuss the limitations based on laboratory tests. We found a linear relationship between the momentum of colliding particles and the maximum amplitude of the acoustic wave, and found that the grain size can be calculated using this linear relationship. We determined the range over which this linear relationship holds, and found that it depended on the amplifier gain; we then used it to calculate the maximum flow depth. The median frequency and the form of the frequency distribution of the acoustic wave depended on the grain size, slightly on the flow discharge. The bedload transport rate can be calaculated using the velocity of the bedload and the sediment volume in the bedload layer using the linear relationship between the momentum of the colliding particles and the maximum amplitude of the acoustic wave.
  • 佐野 千尋, 布川 雅典, 笠井 美青, 丸谷 知己
    北方森林研究 61 0 129 - 131 北方森林学会 2013年 [査読有り][通常論文]
  • レーザー測量データを用いた岩盤クリープ斜面の表面形状把握
    横山修, 内田太郎, 中野陽子, 石塚忠範, 笠井美青, 鈴木隆司
    砂防学会誌 64 6 13 - 24 2012年03月 [査読有り][通常論文]
  • 木村 誇, 笠井 美青, 戎 信宏, 丸谷 知己
    地形 33 1 61 - 81 日本地形学連合 2012年01月25日 [査読有り][通常論文]
     
    This study examines the pattern of episodic sediment yield and relationship to catchment morphology within 13 steep and credible headwater catchments in the Hidaka Mountain Range, Hokkaido. The history of episodic sediment yield of each catchment was dendrochronogically reconstructed from the sequence of sediment accumulated on debris fans at catchment outlets. The timing of fan growth was then compared with landslide distributions and rainfall records for the past 40 years, to determine the connectivity between slope and channel processes as well as the sensitivity of catchments for episod...
  • 内田太郎, 中野陽子, 秋山浩一, 田村圭司, 笠井美青, 鈴木隆司
    地形 31 4 383 - 402 日本地形学連合 2010年 [査読有り][通常論文]
     
    In the last decade, a variety of studies examined applicability of high-resolution topographic data developed by LiDAR data for prediction and clarification of sediment movement, including debris flow, shallow landslide, deep-seated landslide and so on. Here we examine (1) usefulness for prediction of shallow landslide location using simple physically based model and (2) effectiveness for identifying mass-rock creeping slopes based on the characteristic eigenvalue ratio and slope angle. We analyzed the data of the shallow landslides at Hiroshima, Japan and showed high-resolution topographic data was useful for prediction of shallow landslide location. We also confirmed effectiveness for identifying mass-rock creeping slopes based on the analysis of the data of Waniduka Mt., Miyazaki, Japan.
  • 千葉伸一, 藤澤和範, 笠井美青, 杉田理, 佐藤成将, 菅沼健
    日本地すべり学会誌 47 1 60 - 65 The Japan Landslide Society 2010年 [査読有り][通常論文]
  • Mio Kasai, Manabu Ikeda, Toshihiro Asahina, Kazunori Fujisawa
    GEOMORPHOLOGY 113 1-2 57 - 69 2009年12月 [査読有り][通常論文]
     
    In steep and rocky terrains, their rough surfaces make it difficult to create landslide inventories even with detailed maps/images produced from airborne LiDAR data. To provide objective clues in locating deep-seated landslides, the surface textures of a 5 km(2) steepland area in Japan was investigated using the eigenvalue ratio and slope filters calculated from a very high resolution LiDAR-derived DEM. The range of filter values was determined for each of a number of surface features mapped in the field and these included: cracked bedrock outcrops, coarse colluvial deposits, gently undulating surfaces, and smooth surfaces. Recently active slides commonly contained patches of ground in which deposition and erosion occurred together near the erosion front, or where cracked bedrock outcrops and coarse colluvial deposits coexisted under a gently undulating surface. The characteristic eigenvalue and slope filter values representing this sliding process were applied to maps of the DEM derived filter values to extract potential sites of recent landslide activity. In addition, the relationships between the filter values of deep-seated landslides at various stages of evolution within the field mapped area were extended to the entire study area, to assess the contribution that landslide evolution makes to change in the landscape as a whole. While landslide components made up the steepest as well as the gentlest parts of the landscape depending on their evolutionary stage, landslides were constantly coarsened and steepened by progressive erosion, probably initiated by river bank erosion at the foot of slopes. (C) 2009 Elsevier B.V. All rights reserved.
  • 航空レーザー測量データから作成されたDEMの解析に基づく地すべり地形発達プロセスの推定
    笠井美青, 池田学, 藤澤和範, 松田昌之, 鈴木雄介
    日本地すべり学会誌 45 2 118 - 124 2008年 [査読有り][通常論文]
  • Kirstie A. Fryirs, Gary J. Brierley, Nicholas J. Preston, Mio Kasai
    CATENA 70 1 49 - 67 2007年06月 [査読有り][通常論文]
     
    Catchment configuration and the nature of connectivity within and between landscape compartments affect the operation of sediment cascades and geomorphic responses to disturbance events of differing magnitude and frequency. This paper introduces the concept of landform impediments, termed buffers, bangers and blankets, that impede sediment conveyance by limiting the connectivity between landscape compartments. Buffers restrict sediment delivery to channels, barriers inhibit sediment movement along channels, and blankets drape channel or floodplain surfaces affecting the accessibility of sediment to entrainment. These features operate as a series of switches which turn on/off processes of sediment delivery, determining the effective catchment area at any given time. Using previously documented examples, the role of these features in affecting the operation of sediment cascades in a low relief, passive landscape setting such as the Australian landmass is contrasted to examples from high relief, uplifting settings in New Zealand. The Australian examples are further explored by examining how changes to landscape connectivity brought about by human disturbance since European settlement have impacted upon landscape sensitivity and prospects for river recovery. This approach to analysis of impediments to sediment conveyance is generic and can be applied in any environmental setting. (C) 2006 Elsevier B.V. All rights reserved.
  • Mio Kasai
    GEOMORPHOLOGY 81 3-4 421 - 439 2006年11月 [査読有り][通常論文]
     
    In headwater streams in steep land settings, narrow and steep valley floors provide closely coupled relationships between geomorphic components including hillslopes, tributary fans, and channel reaches. These relationships together with small catchment sizes result in episodic changes to the amount of stored sediment in channels. Major sediment inputs follow high magnitude events. Subsequent exponential losses via removal of material can be represented by a relaxation curve. The influence of hillslope and tributary processes on relaxation curves, and that of altered coupling relations between components, were investigated along a 1.3 km reach of a degrading channel in the 4.8 km(2) Weraamaia Catchment, New Zealand. Extensive deforestation in the late 19th and early 20th centuries, followed by invasion of scrubs and reforestation, induced changes to major erosion types from gully complexes to shallow landslides. Changes in the size and pattern of sediment slugs from 1938 to 2002 were analysed from air photographs tied to detailed field measurement. The rate and calibre of sediment flux changed progressively following substantive hillslope input in a storm in 1938. Subsequently, the channel narrowed and incised, decoupling tributary fans from the main stem, thereby scaling down the size of sediment slugs. As a consequence, the dominant influence on the behaviour of sediment slugs and associated relaxation processes, changed from tributary fans to the type and distribution of bedrock outcrops along the reach. (c) 2006 Elsevier B.V. All rights reserved.
  • M Kasai, GJ Brierley, MJ Page, T Marutani, NA Trustrum
    CATENA 64 1 27 - 60 2005年11月 [査読有り][通常論文]
     
    Forest clearance between the 1890s and the early 1920s, subsequent scrub growth, and commencement of an afforestation program in 1979, modified the pattern and rate of sediment delivery to valley floors via shallow landslides and gully complexes in a steep headwater catchment (4.8 km(2)) in New Zealand. Analysis of the historical record, air photograph interpretation, and field survey indicates that both erosion types occurred across the catchment in the 1938 storm, aggrading channel beds and widening the active channel zone. In contrast, a I in 100 year event in 1988 (Cyclone Bola) induced numerous shallow landslides,,but erosion of gully complexes was largely restricted to subcatchments that retained pasture, and the geomorphic impact of this event on channels was small. The changing volume and calibre of materials delivered to the valley floor, and the distribution of gully complexes, altered patterns and rates of channel adjustment after the events, and de resulting sediment flux. Development of gully complexes maintained coupling processes with channels for periods up to 102 years, forming wide channels in downstream reaches. Upstream-dowmtream connectivity along the trunk stream was altered by the formation of a large debris fan at the confluence with a tributary subjected to gully complex erosion. In contrast, slopes subjected to shallow landslides became decoupled from channels within 10 years, accelerating channel degradation and narrowing. Effective conveyance of a large volume of fine-grained materials promoted immediate aggradation of gentle-gradient channels downstream. As gully complex areas stabilized following an increase in forest and scrub cover, channel courses became significant sediment sources. Although shallow landslide activity will continue to induce intermittent aggradation in the future, it is inferred that average sediment yield will continue to diminish to levels approaching those experienced prior to clearcutting, and the pattern of sediment flux will recover by 2030. (c) 2005 Elsevier B.V. All rights reserved.
  • M Kasai, T Marutani, G Brierley
    GEOMORPHOLOGY 62 3-4 199 - 215 2004年10月 [査読有り][通常論文]
     
    A typhoon in 1993 induced major aggradation along Oyabu Creek, a steep, gravel bed mountain stream in Kyushu, Japan. Processes of sediment reworking are inferred from a 7-year monitoring program that measured adjustments to channel cross-sections, the longitudinal profile, and the extent/distribution of bedrock outcrops along a 3-km study reach. Over time, the reach adopted a riffle and pool structure, with notable increase in the area of exposed bedrock on the bed. This adjustment process was characterised by progressive reduction in sediment storage change per unit flow. The relaxation pathway following disturbance induced by the typhoon was shaped by the magnitude and frequency of subsequent rainfall events, the capacity of these events to transport available sediments, and physical linkages between reaches. Adjacent subreaches demonstrated differing relaxation pathways in response to these influences, induced by spatial and temporal variability in threshold conditions along the channel. Longer-term evidence indicates that responses to major disturbance, such as the 1993 typhoon, occur as 'cycles' of around 20-year duration. A relaxation period of 7 years is required to attain a quasi-equilibrium bed configuration and rate of sediment flux. The timeframe of cycles is considered to reflect changes to hillslope-channel bed coupling, marking the period required to generate sufficient sediment stores to reactivate phases of aggradation and subsequent degradation. (C) 2004 Elsevier B.V. All rights reserved.
  • M Kasai, T Marutani, GJ Brierley
    EARTH SURFACE PROCESSES AND LANDFORMS 29 1 59 - 76 2004年01月 [査読有り][通常論文]
     
    A six-year monitoring programme characterized the migration/dispersion patterns of sediment slugs generated following typhoon-induced disturbances in 1993 and 1997 along a single-thread gravel-bed stream, Oyabu Creek, on Kyushu Island, Japan. This laterally confined creek comprises riffle-pool sequences with intervening bedrock outcrops. The passage of sediment pulses associated with sediment slug processes reflected, and was controlled by, the riffle-pool structures which provided channel bed roughness, the volume of sediment stored along valley floors, and the distribution of bedrock outcrops. Changes to bed material size following major sediment inputs during the disturbance events also exerted an influence on subsequent sediment slug processes. The sequence of rainfall events, together with changes to channel bed structure, induced different phases in the sediment slug processes. The capacity of a reach to store or trap sediment, as recorded by the longitudinal structure of the channel, varied during these differing phases. Copyright (C) 2004 John Wiley Sons, Ltd.
  • 金 勲, 丸谷 知己, 笠井 美青
    砂防学会誌 : 新砂防 = Journal of the Japan Society of Erosion Control Engineering 55 5 11 - 21 砂防学会 2003年01月15日 [査読有り][通常論文]
  • 橋本 晴行, 渡辺 勝利, 全 柄徳, 上野 賢仁, 山中 稔, 笠井 美青, 野上 昭治, 緒方 勤
    水工学論文集 45 45 805 - 810 公益社団法人 土木学会 2001年 [査読有り][通常論文]
     
    It is important to estimate sediment yield volume accurately in reservoir basins in the planning of the dam-construction. In the present study we select Kasegawa dam under construction in Saga Prefecture as a case study area. We first investigate the land surface condition and vegetation activity in the reservoir basin by using rcmotc-sensing data. Secondly we examine sediment grain size distribution in the rivers in the reservoir basin. On the basis of these results and sediment transport mechanics we finally estimate the sediment yield volume from the reservoir basin.
  • M Kasai, T Marutani, LM Reid, NA Trustrum
    EARTH SURFACE PROCESSES AND LANDFORMS 26 1 1 - 16 2001年01月 [査読有り][通常論文]
     
    The sediment delivery ratio was estimated for two periods (28 years and eight years) following reforestation of seven tributary catchments (0.33 to 0.49 km(2)) in the headwaters of the Waipaoa River basin, North Island, New Zealand. In these catchments, gully erosion, which largely resulted from clearance of the natural forest between 1880 and 1920, is the main source of sediment to streams. Reforestation commenced in the early 1960s in an attempt to stabilize hillslopes and reduce sediment supply. Efforts have been partially successful and channels are now degrading, though gully erosion continues to supply sediment at accelerated rates in parts of the catchment. Data from the area indicate that the sediment delivery ratio (SDR) can be estimated as a function of two variables, psi (the product of catchment area and channel slope) and A, (the temporally averaged gully area for the period). Sediment input from gullies was determined from a well defined relationship between sediment yield and gully area. Sediment scoured from channels was estimated from dated terrace remnants and the current channel bed. Terrace remnants represent aggradation during major floods. This technique provides estimates of SDR averaged over periods between large magnitude terrace-forming events and with the present channel bed. The technique averages out short-term variability in sediment flux. Comparison of gully area and sediment transport between two periods (1960-1988 and 1988-1996) indicates that the annual rate of sediment yield from gullies for the later period has decreased by 77 per cent, sediment scouring in channels has increased by 124 per cent, and sediment delivered from catchments has decreased by 78 per cent. However, average SDR for the tributaries was found to be not significantly different between these periods. This may reflect the small number of catchments examined. It is also due to the fact that the volume of sediment scoured from channels was very small relative to that produced by gullies. According to the equation for SDR determined for the Waipaoa headwaters, SDR increases with increasing catchment area in the case where A, and channel slope are fixed. This is because the amount of sediment produced from a channel by scouring increases with increasing catchment area. However, this relationship does not hold for the main stem of the study catchments, because sediment delivered from its tributaries still continues to accumulate in the channel. Higher order channels are, in effect, at a different stage in the aggradation/degradation cycle and it will take some time until a main channel reflects the effects of reforestation and its bed adjusts to net degradation. Results demonstrate significant differences among even low order catchments, and such differences will need to be taken into consideration when using SDR to estimate sediment yields. Copyright (C) 2001 John Wiley & Sons, Ltd.
  • 丸谷 知己, 笠井 美青, 牧田 正代
    砂防学会誌 : 新砂防 = Journal of the Japan Society of Erosion Control Engineering 52 6 24 - 31 砂防学会 2000年03月15日 [査読有り][通常論文]
     
    Because sediment input volume from branch to main stream is the key knowledge for estimating input-output balance of sediment budget along river channel, this study was focused on the temporal changes in sediment volume supplied from small catchments. Sediment volume was monitored in the concrete sand-pocket(4m×2m×1m)set at the mouth of four small catchments. Each catchment is the area between 2.48 and 10.14 ha and channel slopes of them between 0.093 and 0.249. Sediment volume measurement was conducted at 17 times during three years. The influence of catchment area, such as channel slope, landslide area and its occurrence years, on sediment volume supplied from each catchment was examined. The proportion of the duration rainfall against the duration sediment volume at each measuring period, sediment supply rate, yields regression line as a exponential curve except for the periods of less rainfall in winter season. This indicates that the sediment supply rate defined as the duration sediment volume per the duration rainfall is applied to any periods, for example, several days or a year. Since the annual sediment supply rate, Vy, decreases according to years after landslide occurrence year, T, the relationship between both is represented as Vy=α⋅exp(-γ⋅T). Here landslide area was likely to response to landslide occurrence as the initial condition, α. Catchment area, relief and averaged channel slope were not likely to influences on decreasing of annual sediment supply rate, γin such small catchments.
  • Sediment generation from numerous shallow landslides related with clear cutting at granite mountain, Mt.Ichifusa, Japan.
    Marutani, T, Kasai, M, Ebisu, N, Trustrum, N.A
    Interpraevent Band 1 271 - 279 2000年 [査読有り][通常論文]
  • 丸谷 知己, 笠井 美青, Reid Leslie M
    水資源研究センタ-研究報告 20 101 - 111 京都大学防災研究所付属水資源研究センタ- 2000年 [査読無し][通常論文]
  • T Marutani, M Kasai, LM Reid, NA Trustrum
    EARTH SURFACE PROCESSES AND LANDFORMS 24 10 881 - 896 1999年09月 [査読有り][通常論文]
     
    Although much is known about overall sediment delivery ratios for catchments as components of sediment production and sediment yield, little is known about the component of temporary sediment storage. Sediment delivery ratios focused on the influence of storm-related sediment storage are measured at Matakonekone and Oil Springs tributaries of the Waipaoa River basin, east coast of New Zealand. The terrace deposits of both tributaries show abundant evidence of storm-related sedimentation, especially sediment delivered from Cyclone Bola, a 50 year return rainfall event which occurred in 1988. The sediment delivery ratio is calculated by dividing the volume of sediment transported from a tributary to the main stream by the volume of sediment generated at erosion sites in the tributary catchment. Because the sediment delivery volume is unknown, it can be calculated as the difference between sediment generation volume and sediment storage volume in the channel reach of the tributary. The volume of sediment generated from erosion sites in each tributary catchment was calculated from measurements made on aerial photographs dating from 1960(1:44 000) and 1988 (1 :27 000). The volume of sediment stored in the tributary can be calculated from measurements of cross-sections located along the tributary channel, which are accompanied by terrace deposits dated by counting annual growth rings of trees on terrace surfaces. Sediment delivery ratios are 0.93 for both Matakonekone catchment and Oil Springs catchment. Results indicate that Oil Springs catchment has contributed more than twice the volume of sediment to the Waipaoa River than the Matakonekone catchment (2.75 x 10(6) m(3) vs 1.22 x 10(6) m(3)). Although large volumes of sediment are initially deposited during floods, subsequent smaller flows scour away much of these deposits. The sediment scouring rate from storage is 1.25 x 10(4) m(3) a(-1) for Matakonekone stream and 0.83 x 10(4) m(3) a(-1) for Oil Springs stream. Matakonekone and Oil Springs channels respond to extreme storms by instantaneously aggrading, then gradually excavating the temporarily stored sediment. Results from Matakonekone and Oil Springs streams suggest a mechanism by which event recurrence interval can strongly influence the magnitude of a geomorphic change. Matakonekone stream with its higher stream power is expected to excavate sediment deposits more rapidly and allow more rapid re-establishment of storage capacity. Copyright (C) 1999 John Wiley & Sons, Ltd.
  • 伊藤 哲, 丸谷知己, 笠井美青
    日本林学会九州支部研究論文集 51 123 - 124 1998年06月 [査読有り][通常論文]
  • 笠井 美青, 丸谷 知己
    砂防学会誌 : 新砂防 = Journal of the Japan Society of Erosion Control Engineering 49 6 17 - 23 砂防学会 1997年03月15日 [査読有り][通常論文]
     
    The morphology of confluence points along mountanious streams is affected by geomorphological characteristics of tributaries, such as catchment size and channel slope. These characteristics also influence the way in which sediment is transported through channels and the volume of sediment supplied to confluence points. This is demonstrated at the Oyabu creek in the Kyushu mountain range, based on 2-years of field observations. The results were as follows.
    (1) At the Oyabu creek, sediment yielded from tributaries accumulated at the confluence points of relatively small steep tributaries, and was transported to the lower reach of confluence points in the case of large gentle tributaries.
    (2) Changes in sediment volume depended on the preceding volume of sediment in storage, irrespective of tributaries characteristics.
    (3) Volumes of sediment yielded from tributaries increased with increasing catchment size.
  • 丸谷 知己, 井倉 洋二, 笠井 美青
    砂防学会誌 : 新砂防 = Journal of the Japan Society of Erosion Control Engineering 49 2 69 - 72 砂防学会 1996年07月15日 [査読有り][通常論文]
  • MARUTANI T.
    Interpraevent Band 1 283 - 292 1996年 [査読有り][通常論文]
  • 丸谷 知己, 笠井 美青
    九州大学農学部演習林報告 72 0 117 - 124 九州大学 1995年03月 [査読有り][通常論文]
  • 丸谷 知己, 笠井 美青
    新砂防 47 6 3 - 7 砂防学会 1995年03月01日 [査読有り][通常論文]
  • 笠井 美青, 丸谷 知己
    日本林學會誌 76 6 560 - 568 一般社団法人日本森林学会 1994年11月01日 [査読有り][通常論文]
     
    風倒木地帯においては、山地の河川に流入した多量の流木が、生産源からの流下過程で組み上がることによって土砂の滞留現象が引き起こされる。このような流木群をwallと定義し、それによる土砂の滞留機構を現地調査と実験とに基づいて明らかにした。現地調査では、流木群の生産源からの流下距離、wa丑強度、滞留土砂量の関係を分析し、wal1強度が最大2.0×10^4にまで達し、このとき滞留土砂量が550m^3になることがわかった。この機構を検討するために水路実験を行い、細砂と礫とからなる段波を形成する流体を流木群に衝突させることによってwa11を形成し、wallの形態(面積、本数)と粒度組成、土砂濃度および滞留礫量との関係について分析した。粒度組成と土砂濃度の異なるケースごとに流体力を計算した結果、礫の割合の少ないケースにおいて流体力が増加することがわかった。これによって、流下距離が長いほど強度の高いwanが形成され、滞留土砂量も増加するという現地での結果が支持された。

書籍

  • Mio Kasai (担当:その他範囲:Can repeat LiDAR surveys locate future massive landslides?)
    Springer 2021年01月 (ISBN: 9783030602277) 504 81-85 
    Kasai M. (2021) Can Repeat LiDAR Surveys Locate Future Massive Landslides?. In: Guzzetti F., Mihalić Arbanas S., Reichenbach P., Sassa K., Bobrowsky P.T., Takara K. (eds) Understanding and Reducing Landslide Disaster Risk. WLF 2020. ICL Contribution to Landslide Disaster Risk Reduction. Springer, Cham. https://doi.org/10.1007/978-3-030-60227-7_7
  • 「地震による地すべり災害」刊行委員会 (担当:分担執筆範囲:3.7 崩壊の面積ー頻度分布の特徴)
    北海道大学出版会 2020年09月 (ISBN: 9784832982352) x, 355p
  • 砂防学
    笠井美青 (担当:分担執筆範囲:地形解析)
    朝倉書店 2019年04月
  • Gravel Bed Rivers 6
    Page, M, Marden, M, Kasai, M, Gomez, B, Peacock, D, Betts, H, Parkner, T, Marutani, T, Trustrum, N (担当:分担執筆範囲:Changes in basin-scale sediment supply and transfer in a rapidly transformed New Zealand landscape)
    Elsevier 2007年
  • 流域学事典―人間による川と大地の変貌―
    笠井美青 (担当:分担執筆範囲:「柔岩地帯の河川」「土砂流出の規模と頻度」「土砂収支」「セディメントウェーブ」)
    北大図書刊行会 2006年

講演・口頭発表等

  • Assessment of post-seismic landslide susceptibility using an index representative of seismic cracks
    Mio Kasai, Shui Yamaguchi
    EGU General Assembly 2022 2022年05月 口頭発表(一般)
  • 地震亀裂に着目した2016年熊本地震後の崩壊危険度評価
    山口柊生, 笠井美青
    令和4年度砂防学会研究発表会(宮崎 オンライン) 2022年05月 口頭発表(一般)
  • UAV-LiDARとUAVマルチスペクトルセンサを用いた地すべり活動の把握
    野口絹子, 笠井美青, 早川裕弌, 飯塚浩太郎, 小口高
    日本地形学連合秋季大会 2021年12月 口頭発表(一般)
  • Can repeat LiDAR surveys locate future massive landslides?
    Mio Kasai
    World Landslide Forum 5 2021年11月 口頭発表(一般)
  • A new index representative of seismic cracks to assess post-seismic landslide susceptibility  [招待講演]
    Mio Kasai, Shui Yamaguchi
    Italy-Japan joint workshop on landslide monitoring systems and related topics 2021年11月 口頭発表(一般)
  • 2016年熊本地震後の崩壊危険度評価
    山口柊生, 笠井美青
    第60回地すべり学会研究発表会 2021年09月 口頭発表(一般)
  • 北海道胆振東部地震で発生した地すべり斜面における地震前の地形的特徴
    武井健太, 笠井美青
    第60回 日本地すべり学会研究発表会 2021年09月 ポスター発表
  • Incorporating ground cracks in the estimation of post-seismic landslide susceptibility
    Shui Yamaguchi, Mio Kasai
    Geomorphometry 2021 2021年09月 口頭発表(一般)
  • ALBとドローン空撮による戸蔦別川における河床変動観測
    岸本海笛, 笠井美青, 佐野寿聰
    鵡川・沙流川流域土砂動態現地勉強会(第11回) 2021年08月 口頭発表(一般)
  • 亀裂を考慮した地震後の崩壊危険度評価
    山口柊生, 笠井美青
    日本地球惑星科学連合2021年大会 2021年06月 ポスター発表
  • ALBとドローン空撮による、北海道東部戸蔦別川における河床低下プロセスの観測
    岸本海笛, 笠井美青, 佐野寿聰
    日本地球惑星科学連合2021年大会 2021年06月 ポスター発表 オンライン
  • 平成28年8月北海道豪雨時の戸蔦別川における河畔林流失と河床剪断力
    法覚俊, 笠井美青, 山田孝
    砂防学会研究発表会概要集(Web) 2020年
  • 北海道十勝川水系における平成28年8月出水での河道変化
    青木大輔, 笠井美青, 山田孝
    砂防学会研究発表会概要集(Web) 2019年
  • 流域サイズと出水時の発生流木量の関係
    法覚俊, 笠井美青, 山田孝
    砂防学会研究発表会概要集(Web) 2019年
  • 北海道における土砂災害リスクの特徴
    小山内信智, 林真一郎, 古市剛久, 山田孝, 笠井美青, 桂真也
    砂防学会研究発表会概要集(Web) 2019年
  • 火山泥流に寄与する融雪水量推定のための実験的研究 -熱水混じりの高温土砂が積雪に供給される場合-
    鈴木貴大, 山田孝, 笠井美青
    雪氷研究大会講演要旨集(Web) 2018年
  • 砂防・治山の国際的な貢献に向けて-ニュージーランドとの学術交流・共同研究-
    丸谷知己, 笠井美青, 山田孝
    砂防学会研究発表会概要集 2015年
  • 土石流によって流出した大径木の木造家屋への衝突-2014年8月20日の広島県広島市安佐南区での事例-
    吉留慧, 山田孝, 笠井美青, 野呂智之
    砂防学会研究発表会概要集 2015年
  • 流木を含んだ土石流の衝突荷重測定実験
    野坂隆幸, 笠井美青, 丸谷知己, 山田孝
    砂防学会研究発表会概要集 2015年

その他活動・業績

教育活動情報

主要な担当授業

  • 森林緑地調査解析学特論Ⅰ
    開講年度 : 2021年
    課程区分 : 修士課程
    開講学部 : 農学院
    キーワード : 修士論文、景観、種、DNA、微地形、斜面崩壊
  • 砂防工学
    開講年度 : 2021年
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 水土砂災害・山地砂防・火山砂防・治山砂防技術・ソフト対策・流域総合土砂管理
  • 森林測量学
    開講年度 : 2021年
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 森林測量,距離測量,角測量,水準測量,トラバース測量,誤差論,最小二乗法,最新の測量技術,測量データの処理,測量データの応用,地形判読
  • 森林測量学実習
    開講年度 : 2021年
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 森林測量,距離測量,角測量,水準測量,トラバース測量,誤差論,最小二乗法,最新の測量技術,測量データの処理,測量データの応用,地形判読
  • 英語演習
    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 : 森林生態系の管理・保全、樹木の構造と性質、木質バイオマスの利活用
  • 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 : 組織構造、環境応答、強度、木質バイオマス、樹木の化学成分、オゾン・酸性雨、保全管理、森林管理、生物多様性、生態系サービス、国土保全、森林政策
  • 森林保全実習
    開講年度 : 2021年
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 流域保全、資源利用、森林と地域社会、自然災害の軽減・修復
  • 流域保全論
    開講年度 : 2021年
    課程区分 : 学士課程
    開講学部 : 農学部
    キーワード : 流域の認識手法、「流域住民」としての意識形成手法、合意形成、流域環境・生態系保全、防災、地域振興、土地利用

大学運営

学内役職歴

  • 2019年4月1日 - 2021年3月31日 広域複合災害研究センター副センター長

委員歴

  • 2022年06月 - 現在   国立研究開発法人森林研究・整備機構森林総合研究所   北海道地域評議会委員
  • 2022年01月 - 現在   国立研究開発法人土木研究所外部評価委員会河川系分科会 委員
  • 2021年08月 - 現在   十勝岳火山流木対策検討委員会   委員
  • 2021年08月 - 現在   火山防災に係る調査企画委員会   委員
  • 2020年05月 - 現在   北海道水資源保全審議会   副会長
  • 2019年04月 - 現在   北海道環境影響評価審議会   委員
  • 2018年07月 - 現在   北海道地すべり学会運営委員会   委員
  • 2018年07月 - 現在   北海道特定開発行為審査会   委員
  • 2018年06月 - 現在   北海道防災会議   専門委員
  • 2018年04月 - 現在   大規模土砂災害対策研究機構   委員
  • 2016年10月 - 現在   北海道土地利用審査会   委員
  • 2011年11月 - 現在   北海道開発局大規模土砂災害対策検討会   アドバイザー
  • 2019年11月 - 2021年03月   砂防フロンティア整備推進機構砂防関係指定地管理専門技術委員会   委員
  • 2018年08月 - 2021年03月   大雪山火山噴火緊急減災対策砂防検討委員会   委員長
  • 2018年07月 - 2021年03月   恵山火山噴火緊急減災対策砂防検討委員会   委員長
  • 2018年06月 - 2019年03月   十勝川流域砂防技術検討会補助部会   委員
  • 2018年06月 - 2019年03月   十勝川流域砂防技術検討会直轄部会   委員
  • 2018年02月   砂防事業評価委員会   委員
  • 2017年11月   砂防技術評価委員会   委員


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