BEHAVIORS OF LARGE TURBID CURRENT AND COUNTERMEASURES FOR LONG TERM TURBIDITY PROBLEM IN THE STRATIFIED RESERVOIR

摘要

A series of numerical calculation results are shown on dynamic behaviors of turbid current in the reservoir. With a large volume of the current, it flows down along the bottom of the reservoir, and the return current after clashing the dam contributes much on mixing of the turbid water with surroundings, causing prolonged turbidity in the reservoir. The mechanism implied possible treatments to reduce the volume of the turbid water. Numerical experiments indicate that successful purging the turbid water by a low layer outlet, such as a selective withdrawal device, reduces the period of turbid water by 88%. Then, some calculations are conducted to improve the condition of sediment flow in reservoirs. The results suggest that the behavior of sediment flow can be controlled if the stratification condition or the outlet elevation in reservoirs can be changed.