COMPUTATIONAL ANALYSIS OF FLOW AND SEDIMENT TRANSPORT IN THE LOWER REACH OF CHIKUGO RIVER FOR THE QUANTITATIVE EVALUATION ON THE FUNCTIONS OF WAKATSU PORT TRAINING LEVEE

Abstract

This study has a quantitative evaluation on the functions of Wakatsu Port training levee in the lower reach of Chikugo River. Numerical simulations of flow and sediment transport in this lower reach of Chikugo River are implemented. 1D unsteady flow numerical simulation is executed to obtain the boundary conditions for a quasi-3D unsteady flow model which is used to simulate the detailed flow features around the training levee. The movement of sediment in the water is simulated by solving the 3D diffusion equation for the sediment. As a result of the 3D flow simulation, it becomes apparent that the existence of training levee causes to accelerate the flow of left bank side of the river. The sediment transport analysis gave understanding of the deposition conditions by comparing the river bed variation distribution.