The rainfall-runoff analysis about the change of the forest cover using the high-precision analysis method considered the water-holding capacity of the forest soil

Abstract

 Water circulation model was constructed for the upper watershed of Shimanto river in Kochi prefecture to accurately predict the river discharge. This model has a feature to take into account of the soil thickness on the forest slopes and of the specific meandering of the Shimanto river. It was revealed through the model that the long-term outflow of deciduous forests has increased slightly from cypress forests, and there was no consistent trend between deciduous forest and cypress at the short-term outflow.