放水路周辺海浜の汀線変動とその要因

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タイトル別名
  • Shoreline Change and its Factors around the Outlet of Discharge Channel
  • ホウスイロ シュウヘン カイヒン ノ テイセン ヘンドウ ト ソノ ヨウイン

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抄録

The beach shoreline change and its factors in the Nozumi-Teradomari coast, where the outlet of discharge channel is located, are analyzed by the aerial photographs and bottom sounding surveys. Flood index is introduced as a factor to forecast the shoreline change, instead of estimating the volume of sediment run-off from the river Shinano. It is analyzed the relationship between shoreline change and flood index that is obtained from daily discharge at the reference point of flood plan in the river Shinano.<BR>By the analysis above, the followings were recognized regarding to the shoreline change.<BR>1) The left side shoreline of discharge channel was to be advanced after the period of frequent occurrence of large-scale flood, on the other hand it was to be retreated when large-scale flood occurred few or none.<BR>2) The amount of change in the right side shoreline was less than the left side one, and it began to change about 1-2 years later than the left bank.<BR>3) It was shown that by using the flood index of the year at the reference point of the basin, it is able to forecast the trend of shoreline change in the next year.

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