七浦塘引水对阳澄湖河网水环境影响的模拟研究

为准确地衡量七浦塘引水工程的运行方式对阳澄湖及周边河网产生的影响,基于太湖水量水质模型设计了7种数值实验,从引水量和雨型两个角度对七浦塘引水对阳澄湖及周边河网造成的影响进行了评估,并定义了河网总体水质达标率作为评估标准。结果表明:七浦塘引水使得水量向阳澄湖北线和南线河道集中,在改善阳澄湖西湖水质的同时恶化了中东湖的水质;七浦闸引水量在20~40 m3/s之间时对提高河网水质总体达标率最为有利;引水对河网水质的影响具有显著的空间差异性;在不同雨情条件下,七浦塘引水调度均可在一定程度上改善河网和湖体的水质。

Simulation study of water enviroment influence on Yangcheng Lake river networks by Qipu River water diversion project

In order to accurately measure the influence of operation mode of Qipu River water diversion project for Yangcheng Lake and the surrounding river networks, 7 numerical experiments were designed based on Taihu water quality and quatity model. The influence is evaluated from two aspects of diversion volume and rainfall type, and the overall water quality compliance rate of river network is defined as the evaluation criteria. The results show that the water concentrated to the northern and southern rivers, and the water qulity of west part of Yangcheng Lake improved while the middle and eastern part deteriorated, it was also revealed that the best improvement of water quality happened when the water diversion volume ranged between 20~40 m³/s. The effect of water diversion on the water quality of the river network has a significant spatial difference. In different rainfall conditions, water quality of river networks and lake can be improved by the water diversion scheduling to a certain extent.