STUDIES ON FORMATION PROCESS OF WATER QUALITY HYDROGRAPH IN A SLOPE

Abstract

The purpose of the present study is to clarify formation process of the water quality hydrograph. We obtained a partial differential equation to explain the formation of pollutant hydrograph with overland or subsurface flow in a slope. This equation was numerically calculated with a runoff equation. Further, we obtained two ordinary equations to approximately and conveniently express the hydrographs of discharge and water quality. The characteristics of water quality hydrograph observed in mountainous basins can be explained rationally by the method proposed in this paper.