Simulation of Sudden Water Pollution Accidents in Hunhe River Basin Upstream of Dahuofang Reservoir

Abstract

Dahuofang Reservoir is an important drinking water source for Shenyang, Fushun, Anshan, Liaoyang, and other cities. The water quality of the upstream inflow river directly affects the water supply safety. When a sudden water pollution accident occurs upstream of the reservoir, the pollution risk to the water source can be minimized if the variation rule of pollutant concentration along the course can be accurately simulated in time. Therefore, based on Mike 21, this paper established a hydrodynamic water quality coupling model of the Hun River basin upstream of Dahuofang Reservoir, and determined and verified the relevant parameters of the hydrodynamic model. In establishing the water quality model, the improved empirical frequency curve method was adopted to divide the high-flow period, the level period, and the low-flow period, so that the hydraulic conditions in each period were more reasonable. By a hypothetical scenario and working condition design, the suspended iron concentration and COD concentration along the course of a sudden water pollution accident were simulated. The diffusion rules of pollutants in different periods and under different working conditions were obtained. The most important objective was to obtain the six early warning index values in different hydrological periods, which allows the prediction of the scope and extent of the accident and provides a basis for ensuring the safety of the water supply at the water source.