RUNOFF SIMULATION AND ITS IMPACT ON WATER QUALITY IN THE KAMAFUSA LAKE CATCHMENT

摘要

The runoff process is firstly simulated by using of the Xinanjiang model in the Kamafusa Lake catchment in Miyagi Prefecture of Japan, and the water quality changes of the Kamafusa Lake in recent 9 years are analyzed by considering the different runoff components. The relationships between the runoff components and water quality changes are finally concluded. The study shows the Biochemical Oxygen Demand (COD) concentration of the lake water is affected mainly by the sub-surface runoff component, and on the contrary, Suspended Solid (SS) concentration is affected mainly by surface runoff component.