2011•京都大学防災研究所年報Requires access
Erosion Characteristics of Cohesive Sediment by Non-Cohesive Sediment
Puji Harsanto, Nguyen Manh Minh Toan, Hiroshi TAKEBAYASHI, Masaharu Fujita
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Abstract
Synopsis The purpose of this paper is to study the erosion characteristics of cohesive sediment by both non-cohesive sediment and clear water. The results of flume experiment and the dynamic shear stress on the bed are discussed. The flume experiments were conducted with non-cohesive sediment is supplied on the cohesive sediment. The transport rate of the non-cohesive sediment supply is varied from 0 to 150% of the equilibrium sediment transport rate. The results indicate that, when bed is composed of 100% cohesive sediment, the bed degradation depth with sediment supply are more than without sediment supply or in clear water and the erosion rate is decreased with increase in sediment discharge. Because the dynamic shear stress on the bed is decreased with increase in sediment discharge.