水质模型在水资源保护管理中的应用--以某市为例

Application of Water Quality Model in Water Resources Protection and Management-Taking a City as an Example

某市位于长江大保护范围之内,为改善该市水质,建立了其内湖的水动力、水质耦合模型。模型的率定验证结果表明:模型可以准确的模拟出内湖的水动力水质情况,其中水动力模型的NSE为0.9128,水质模型的平均误差不超过30%。通过模型对新建污水厂管网工程及面源污染削减工程的实施效果进行了模拟分析,结果表明:在新建污水厂管网工程及面源削减工程下,五湖水质均有明显改善,其中湖1、湖2、湖3水质可以稳定达到Ⅲ类水标准,湖4及湖5水质仍难以达标,湖4、湖5难以达标可能与长期的底泥负荷积累有关,建议通过清淤工程来改善水质。研究成果表明,数值模型可以有效的为水环境工程措施提供指导性的建议,为工程提供科学依据及方案。

A city is located within the protection area of the Yangtze River. In order to improve the water quality of the city,a hydrodynamic and water quality coupling model of its inner lake has been established. The calibration verification results of the model showed that the model can accurately simulate the hydrodynamic water quality of the inner lake. The NSE of the hydrodynamic model is 0. 9128,and the average error of the water quality model is less than? 30%. The simulation analysis of the implementation effects of the new sewage plant pipe network project and the non-point source pollution reduction project through the model showed that the water quality of the five lakes has been significantly improved under the new sewage plant pipe network project and the non-point source pollution reduction project. The water quality of Lake 1,Lake 2 and Lake 3 can stably reach the standard of Class Ⅲ water quality. The water quality of Lake 4 and Lake 5 is still difficult to reach the standard. The difficulty in reaching the standard of Lake 4 and Lake 5 may be related to long-term sediment load accumulation. It is recommended to improve water quality by dredging works. The research results showed that the numerical model can effectively provide guiding suggestions for water environment engineering measures,and provide scientific basis and plans for the engineering.