海岸を観光資源とするまちにおける費用便益分析を用いた最適海岸堤防高さの設定方法の検討  [in Japanese] STUDY ON SETTING METHOD OF OPTIMUM COASTAL EMBANKMENT HEIGHT USING COST-BENEFIT ANALYSIS IN A TOWN UTILIZING COASTS AS TOURISM RESOURCES  [in Japanese]

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Abstract

本研究では,海岸を観光資源とするまちにおける海岸堤防整備高の設定方法と課題について検討する.具体的には,南海トラフ地震津波による被害が想定されている観光業を生業とする地域を対象とし,海岸堤防を嵩上げすることで減少すると考えられる海岸の価値を考慮し,海岸堤防の整備費用とそれによって得られる減災の便益を比較する.その結果,ソフト対策で避難成功率を上げることの重要性や,環境価値を考慮することで,海岸堤防の嵩上げの純便益がマイナスになる可能性があることを明らかにした.

 To consider the optimum way to improve coastal embankments from two perspectives, disaster prevention and town planning, this study discusses the setting method of optimum height of coastal embankment using cost-benefit analysis. The target area of our case study is a coastal town in Izu Peninsula, Shizuoka Prefecture, utilizing coasts as tourism resources. The target area is expected to suffer damage caused by earthquake and tsunami along Nankai Trough near future. This study conducts cost-benefit analysis of improving coastal embankment in consideration of declining coastal value caused by the increasing of coastal embankment height. The principal aim of this study is to show the options of the coastal embankment heights for decision making process. The results indicate importance of increasing the evacuation success rate by the non-structural measures and possibility of becoming negative value of net benefit by raising coastal embankment by considering the value of coastal environment.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 74(2), I_475-I_480, 2018

    Japan Society of Civil Engineers

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