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Typhoon No.10 approached Hokkaido on August 9th, 2003. Because of incompleted embankment protection, floods, bank erosions, large amount of sediments, and drifiwoods occurred especially in the Appetsu River of Hidaka area. In this study, flood and deposition on the flood plain were reproduced by numerical calculation and their features were discovered. The steady flow calculation was conducted by selecting the peak discharge of this flood event. While, the unsteady calculation was simulated by the calculated hydrograph. The calculation of sediment transport was carried out by the transport equation of suspended load. The sediments were provided from the upstream end of the calculation region. The calculation for water flow, bed load and suspended load, and bed change of flood region were done in a generalized coordinate system. As a result, the characteristics of the flood during typhoon No.10 at the Appetsu River was clarified.

FLOOD AND FLOOD SIMULATION IN THE APPETSU RIVER BASIN, HOKKAIDO, DURING THE TYPHOON NO.10 (2003)