On the Tsunami Runup Energy Dissipation Effect and Impact on Tsunami Inundation of Agricultural Drainage Channels

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  • SEKIJIMA Kenji
    Institute for Rural Engineering, NARO United Graduate School of Agriculture and Science, Tokyo University of Agriculture and Technology
  • KIRI Hirohide
    Institute for Rural Engineering, NARO
  • AZECHI Issaku
    Institute for Rural Engineering, NARO
  • KIMURA Nobuaki
    Institute for Rural Engineering, NARO
  • KOHGO Yuji
    United Graduate School of Agriculture and Science, Tokyo University of Agriculture and Technology

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Other Title
  • 農業用排水路による津波遡上エネルギーの減勢効果と浸水への影響について
  • ノウギョウヨウ ハイスイロ ニ ヨル ツナミ ソジョウ エネルギー ノ ゲン ゼイ コウカ ト シンスイ エ ノ エイキョウ ニ ツイテ

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Abstract

<p>Some reports about the 2011 Great East Japan Earthquake, which caused huge tsunami inundation damages, said that road embankments and trenches parallel to the coastlines might reduce the tsunami energy. To mitigate tsunami disasters in coastal agricultural areas, we are planning to introduce drainage channels to reduce tsunami energy, but the effect of sizes of channels to reduction of tsunami energy is not clear. In this study, we conducted a series of hydraulic model experiment tests with the different sizes of drainage channels and the various tsunami energies in order to verify the effect. Consequently, the effect of width of the channels to reduction of the tsunami energies was larger than that of depth. Even if water existed in the channels, the effect could be seen though the effect was a little bit reduced. Effect to the inundation arrival times was also observed.</p>

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