南通市引江调水对河网水环境改善效果的模拟

Simulation of improvement of water environment in river network of Nantong City by water diversion from Yangtze River

为客观评估南通市引江调水对河网水环境的改善效果,针对该地区进行了河网概化,建立了河网水量水质模型。利用该模型进行了各分区的调水水量分配计算,分析了不同轮次调水对河网COD、NH3-N浓度的改善效果。计算结果表明:通州分区和如皋分区在第2轮引水后水质得到明显改善,如东和海安分区在第4轮引水后水质得到明显改善。研究证实引江调水是一种改善水环境的行之有效方法,为南通市调水方案实施提供了科决策依据。

In order to objectively evaluate the improvement of the water environment in the river network of Nantong City through water diversion from the Yangtze River, the river network of this region was generalized and water quantity and water quality models were established. The models were used to calculate the distribution of diverted water in sub-areas. The reduction of the COD and NH3-N concentrations in the river network during different water diversion stages was analyzed. The results show that the water quality of the Tongzhou and Rugao sub-areas improved significantly during the second stage of water diversion, and the water quality of the Rudong and Haian sub-areas improved significantly during the fourth stage of water diversion. This study shows that water diversion from the Yangtze River is an effective way to improve the water environment, and this provides a scientific decision- making basis for the water diversion scheme of Nantong City.