改善五里湖水环境维持性调水数值模拟研究

Numerical study on the maintaining water-diversion of Wuli Lake for water environment improvement

近20年来,五里湖水质急剧恶化,水质常年劣于Ⅳ类,严重影响了当地经济社会发展,改善五里湖的水质状况成了当务之急。本文结合无锡市水资源保护规划,设计了梅梁湖泵站大流量调水与小流量维持性调水相结合,长广溪出流、曹王泾出流和联合出流的工况。本文应用数值模拟的方法,对改善五里湖水环境效果和较优工程运行方式进行了研究。研究结果表明,维持性调水后,五里湖水质状况有明显改善。综合分析改善效果和调水费用,大流量调水50m3/s达15d后,维持性调水10m3/s或15m3/s为较优调水方案。

In recent 20 years, the water environment of Wuli Lake in Wuxi City has been getting worse and worse and its water quality is usually worse than Class Ⅳ. Its water quality seriously affected the local social and economical development. It is urgent to take effective actions to improve Wuli Lake environment. In this paper, according to the water resources protection plan of Wuxi City, the authors considered both large quantity water diversion and small quantity water diversion together with Changguangxi and Caowangjing outflows for maintaining water quality of the Wuli Lake. The authors studied the water environment improving effects of the nmintaining water diversion by means of numerical computation. The result shows that the water environment quality of Wuli Lake is obviously improved after nmintaining water diversion. After a comprehensive analysis on benefit and cost of the project, the authors considered that after 15 days water diversion of 50m^3/s, the maintaining water diversion of 10m^3/s or 15m^3/s is an optimum diversion scheme