IKI Shinji, NAKAYAMA Ryuji, ABE Shintaro, TSUKAMOTO Yoshio, TERASAWA Hiroaki, NAITO Maki
Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 公益社団法人 土木学会 72 (2) I_763 - I_768 1884-2399 2016
[Not refereed] The natural environment of the Pacific coast of the Tohoku Region was largely affected by the Great East Japan Earthquake which occurred in 2011. Since then, the changes in the natural environment caused by natural recovery and alternation by human activities regarding the restoration and reconstruction projects are observed in the region. In this survey, the quantitative changes of shoreline and land cover (sandy beach, sand dune vegetation, coastal forest, others) of the hinterland from 1970s to 2014 were analyzed. The target area contains the sandy/muddy beaches of Aomori prefecture to Chiba prefecture (about 680km) which were affected by the 2011 Tohoku Tsunami. As a result, it was observed that the area of coastal forest decreased as the one of development land increased, and the area of sand dune vegetation decreased due to retreat of shoreline after the earthquake. Also, it was found that features of those changes differed depending on the coasts. In some coasts, the sand quickly returned to the beaches, whereas in some others, recoveries were not observed even at the sandbars of river mouth.