Hydraulic Functions of the Pile Dike and Its Impact on Fish Behavior in the Vicinity

Abstract

This research consists of three parts. First is the study about the flow influenced by the pile dike in the river. Second is an examination of whether regions in pile dikes are suitable as a habitat for fish. Third is a numerical analysis concerning the relationship between the flow and the behavior of fish.To complete the first part, velocity of flow and water depth in an open channel is measured. In the second part, fresh water fish (Tribolodon hakonensis) are released into the flow and their behavior is observed by video camera. Finally, the two-dimensional shallow water equation is used to examine the profile of the flow. The random walk method is adopted to examine the behavior of fish in the flow.The flow and the behavior of fish in the channel become clean through our experiment and numerical analysis.