Evaluation of the Non-point Pollutant Runoff Based on Geographic Information System
抄録
Recently, eutrophication becomes serious in the enclosed water bodies. In order to attain the sound and sustainable water environment, reduction of pollutant runoff from the watershed should be pursued as well as purification of water at the water bodies themselves. From the viewpoint mentioned above, pollutants from not only the point source but also the non-point one must preferably be reduced. For this purpose, detachment rates of pollutants from the non-point source were discussed related to the condition of watershed and a series of rainfall. Discussing the effects of several factors on the detachment coefficient, the following equation has been derived. k=a×R^b×L^c×S^d Here, k is the detachment coefficient, R the antecedent rainfall, L the class of land use, S the soil type, and a to d the parameters. Here, parameters included in the equation have been identified, referred to the data of the Honmyo River basin. This kind of equation is surely expected to be available for an estimation of pollutant runoff rates from the non-point sources.
GISデータに基づく非点源汚濁負荷流出量の評価
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