GRASP OF SEDIMENT MOVEMENT FOCUSING ON CAPUTURING FUNCTION OF FINE SEDIMENT IN LAKE JUSAN

Abstract

To clarify the mechanism of the physical environment of Lake Jusan, which is one of brackish lakes in Japan, we focused on movement of fine sediment, and performed field measurements. We measured sediment concentration and turbidity from 2007.6, to measure the sediment transport that flow in or flow out from Lake Jusan, and calculated sediment budget. We also collected and analyzed the bottom sediment. The results indicated that fine sediments supplied from the upper reaches are caught in Lake Jusan at certain ratio, and this system is influenced by frequency and scale of flood and bottom sediments resuspension caused by wind waves.