Flood and Land Use at the Upstream Area of Narrow Pass : Case Study of Inakyo Narrow Pass, the Tenryu River

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  • 河道狭窄部上流域における洪水と土地利用 : 天竜川上流・伊那峡を対象として
  • カドウ キョウサクブ ジョウリュウイキ ニ オケル コウズイ ト トチ リヨウ : テンリュウガワ ジョウリュウ ・ イナキョウ オ タイショウ ト シテ

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Abstract

A large quantity outflows by the frequent heavy rain and the change of basin environment raise possibility to expand the flood damage. Therefore, the flood control measures limited to only river channel are not necessarily effective, so that it is asked for that we should examine the comprehensive flood control measures including topography and land use. We carried out flood flow simulation using onedimensional steady flow model and estimated land use correlated with flood and topography in Meiji, Showa and Heisei periods in upstream area of Inakyo narrow pass, the Tenryu River. Consequently, the water level of the Tenryu River was raised by Iakyo narrow pass, and the backwater affected the tributary. It is difficult to control the flood flow at the near upstream area of Inakyo narrow pass. The inhabitants had built their houses at the higher parts and had cultivated paddy field at the lowland in order to avoid flood damage in the early period. Although such land use wisdom has been brought down, the relative height of building estate tend to expand to lowland.

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