PREDICTION OF RUNOFF OF SUSPENDED SOLIDS FROM HONMYO RIVER BASIN UNDER THE WET WEATHER CONDITION

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  • 本明川流域における降雨時の浮遊懸濁物質の流出予測に関する研究
  • ホンミョウガワ リュウイキ ニ オケル コウウジ ノ フユウ ケンダク ブッシツ ノ リュウシュツ ヨソク ニ カンスル ケンキュウ

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Abstract

For the water quality management at receiving waters, the reduction of inflow of pollutant materials from watershed is very important. In this study, in order to clear the pollutant runoff from Honmyo river basin in Nagasaki, Japan, during the wet weather condition, the field observations and the development and application of numerical simulation model were carried out. The observed results show that the concentration of suspended solids (SS) varies with the temporal change of water discharge. At the beginning term of their runoff, first flush can be observed. In the numerical modeling, runoff rate of SS was treaded as the function of the discharge at watershed and the cumulative runoff of SS. From the comparison of computed results and observed ones, it is considered that the developed model can estimate the temporal variation of water discharge and concentration of SS with acceptable errors.

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