TWO-DIMENSIONAL NUMERICAL ANALYSIS OF SUSPENDED SOLID IN HIJI RIVER ESTUARY

Abstract

On the basis of the results of field measurements taken by the authors in 2001, numerical analysis for a suspended solid was carried out by two-dimensional numerical model that includes the aggregation process. The main objectives are to obtain the fundamental data for the effects of turbidity maximum performance of suspended solid on the environment of water quality and the bottom sediment in an estuary. Turbidity maximum occurs in the high water phase at a 6.6km point from the river mouth and the duration of the high concentration is about 1-2 hours. These results agree well with the field measurements. At a 5.5-6.7km point from the river mouth where the aggregation is active, the diameter of the floc is about 100-1, 000 times the diameter of suspended solid at the upper boundary and the effective density of the floc is approximately 13-56kg/m³. It is approximately the same as that of fluid.