2000 Volume 44 Pages 671-676
Cohesive sediment accumulated in an estuary contains fine sand and clay. To investigate the influence of the percentage of fine sand content on the erosion process of cohesive sediment, not only the erosion tests with vertical jets but also vane tests to measure yield stress were conducted. The percentage of fine sand content was varied between 0 and 80%. Both the yield stress of cohesive sediment and the critical condition of erosion are closely related with the adhesive water thickness of soil particles. The former is in proportion to the -5th power of the adhesive water thickness. The latter is in proportion to the -3/5 power of that thickness.
