EROSION RATE FORMULA OF COHESIVE SEDIMENT

Abstract

  Main purpose of this study is to evaluate the erosion rate of cohesive sediment. More than 100 experiments were conducted in a closed conduit, and the test sample was the mixture of kaolin, silica sand, the composition of which was a variable. It was found from this study that a frictional velocity of flow, a water temperature and a water content ratio are the most dominant factors, and the amount of sand or gravel and its grain size contained in the sample, on the other hand, are independent of the erosion rate approximately. Erosion rate formula was derived in this study on the basis of the experimental results. Erosion process was also investigated qualitatively through an image processing.