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For comprehensive management of sediment of inner bays, we attempt to evalaute suspended-solid(SS) source in the watershed of Tamagawa River, one of large rivers flowing into Tokyo Bay. For this purpose, we conducted continuous monitoring of turbidity in four stations and X-ray fluorescence (XRF) analysis of riverbed material obtained at many stations. It is found that the coefficient b in sediment rating curve in low-flow condition is larger than that in high-flow condition in mountain rivers like Akikawa River. The results reveal that 67 % of total SS transports in Tamagawa River is transported from mountain rivers and other of SS is mainly supplied from riverbed materials which are picked up under high-flow conditions. These tendency are also confirmed through the XRF analysis of bed material.

EVALUATION OF SUSPENDED-SOLID SOURCE IN TAMAGAWA RIVER WATERSHED WITH TURBIDITY CONTINUOUS MONITORING AND BED-MATERIAL ANALYSIS