Abstract
The application of a distributed model for river basins is keen issue. However methodologies for its application have not fully discussed. As for river water simulation models, there are fully developed commercial models with the progress of mathematical techniques for hydraulic calculation. The next topic is a description of rainfall runoff phenomena in sub-basins for river water simulation models. Especially in Japan, the upstream areas of rivers are almost covered with forests. A rainfall-runoff model for forested sub-basins is necessary for continuous simulation including several rainfall events and dry weather periods. In this paper, the authors proposed the pseudo-physical rainfall-runoff model for forested area on the assumption that surface and inter flow are related to void ratio and wetness of soil. They applied this model for a mountainous forested basin as one of distributed models. The simulation results fairly agreed with observed data.
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