RUNOFF AND SEDIMENT TRANSPORT CHARACTERISTICS ON THE RIVER SYSTEM OF HIDAKA REGION, HOKKAIDO, BY TYPHOON NO.10, 2003

Abstract

Risk assessment and water resources management are required to get a reliable estimation not only the sub-catchment scale, but also the catchment scale with a few and/or no rain gauge station. A simple 1-D model considering slope runoff and channel flow with soil eroded, sediment transport, floodplain sedimentation and riverbank erosion is presented to assist in predicting the consequences of extreme flood event. Typhoon no.10 were used to validate the proposed numerical model. It was found that the values ε for calculated period were greater than 0.88, indicating well fit between measured data and this proposed model. In addition, the proposed model was exploited to simulate sediment transport problems. The results indicate that calculated sediment yields compared well with measured data. However, a more precisely sediment transport study is needed.