巢湖水源地水质对入湖河流的响应研究

Study of the Response of Water Quality to the Inflows in the Water Source Region of Chaohu Lake

文章基于三维水动力模型ELCOM建模,模拟分析巢湖水源地水质对入湖河流负荷响应关系,以及从白石天河进行引水时调水量不同带来的不同水质改善效果。不同站点水质受到入湖河流负荷影响大小主要与其距离该入湖河流远近相关,但结果同时显示,站点邻近的大流量入湖河流会改变这种响应关系。西部入湖河流需要较长的时间才会对东部水源地水质产生影响。故而,应该优先选择对柘皋河的水质进行改善,以保障水源地的水质。调水对水源地水质改善的模拟结果表明,水源地水质随调水流量的增加而得到较好的改善,计算结果为调水方案的优化提供了参考。

In this paper,three dimensional hydrodynamic model named ELCOM,especially its tracer module,is used to simulate the response relation of water quality in Chaohu Lake to the inflows and the effectiveness of water quality improvement of the water transfer schemes with different volumes of water from Baishitian River. Impact of the loads on each cell,as the results show,always relates to the distance between them,though sometimes this relationship is distorted by the cell＇ s adjacent large-inflowing rivers. It takes a longer period for the western rivers to bring an influence on the water quality in the eastern water sources. Hence,the water quality of Zhegao River should be improved preferentially for conservation of the water sources.Simulation of the water transfer schemes shows that larger quantities of the transferred water would bring better effectiveness of water quality improvement in the water source region,providing a basis for optimization of the water diversion schemes.