Author(s): Hiroshi Takebayashi; Takuya Nakamoto; Masaharu Fujita
Linked Author(s): Hiroshi Takebayashi
Keywords: No Keywords
Abstract: When rocks and cohesive material are exposed at scoured areas in rivers, erosion of bed tends to be suppressed. Sediment transport rate is also suppressed on bed composed of rocks or cohesive material. In the present study, sediment transport and bed deformation characteristics on bed composed of rocks or cohesive material are discussed with attention focused on sediment sorting, based on the results obtained from numerical model of bed deformation. Furthermore the model is applied to the Tonle Sap River in Cambodia. The results show that the bed degradation at the eroded area is suppressed because of the expose of the rigid or the cohesive material. Furthermore, the sediment transport rate is decreased. However, the temporal change of sediment size distribution on bed with rocks and cohesive material is faster that that on bed with non-cohesive material, because sediment is transported to downstream area without being mixed with bed material.
Year: 2010