A study by research groups at Tohoku University, Kyoto University, and Kyushu University revealed that many residents of coastal municipalities nationwide want to consider the coastal ecosystem when constructing huge tide embankments. ..In the areas affected by the Great East Japan Earthquake, huge tide embankments such as castle walls are being built in various places, but it seems that it will throw a stone in the future policy.

 The survey was conducted by Kohei Imamura, a graduate student at Tohoku University, Kohei Takano, a graduate student at Tohoku University, Toru Nakashizuka, a professor at Tohoku University graduate school, Nobuhito Mori, an associate professor at the Disaster Prevention Research Institute, Kyoto University, and Shunsuke Manaki, a professor at Kyushu University graduate school. In January-February 2014, we conducted a web questionnaire on raising the tide embankment and maintaining the ecosystem for residents living in coastal municipalities nationwide, and received responses from 1 men and women in their 2s and 20s.

 According to the survey, the residents said, "The municipality where I live is planning to raise the seawall as a tsunami countermeasure, but as a result of the environmental assessment, it was found that the surrounding wild animals and plants disappear due to the raising. Therefore, the local government decided to review the raising width and consider subsidizing the relocation to a hill as an alternative to the seawall. "

 After that, we asked the respondents to present multiple proposals with different disaster prevention methods and impacts on the ecosystem, and to select the one that they think is most preferable.As a result of statistical analysis of the answers, it is estimated that the upper limit of the permissible reduction rate of coastal flora and fauna in exchange for raising the seawall is 18.7%, and it is thought that raising beyond that should not be done. understand.

 People who visit the sea more often dislike the adverse effects on the ecosystem and are negative about raising the seawall, while those who think that their current residence is more likely to be damaged by storm surges and tsunamis are those who think that the seawall is likely to be damaged. There is a tendency to prefer the raising plan.

 The survey was conducted as part of the Ministry of Education, Culture, Sports, Science and Technology's Climate Change Risk Information Creation Program, and the results were published in the electronic version of the scientific magazine "Natural Hazard."

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