大型城市湖泊群引水调度模式研究

武汉东湖是国内最大的城中湖,东湖、沙湖、严西湖和北湖组成了大型城市湖泊群。＂大东湖生态水网构建工程＂将重建长江与湖泊群的水力联系,通过引江济湖改善湖泊群的水生态系统。为确定工程合理的引水调度模式,本文建立了湖泊群水动力水质模型,采用正交规则网格,考虑污染物的自然降解和底泥释放,采用零厚度隔板模拟湖中的隔堤,并对模型进行了率定和验证。综合考虑可引长江水量和入湖径流总量,选取典型平水年,对三种引江济湖调度模式进行了深入研究,通过建立的水动力水质模型的动态模拟计算,分析与比较各种调度模式的引水效果,为大东湖生态水网连通工程的实施提供科学的决策依据。

Study on water diversion schemes of large urban lake group

East lake in Wuhan is the largest urban lake in China and East lake,Shahu lake,Yanxi lake and North lake compose a large group of urban lakes.The project of East lakes ecology-oriented water network is to reestablish a hydraulic connection of this lake group to the Yangtze River and to improve its water ecology system by water diversion from the Yangtze River.A hydrodynamic and water quality model based on rectangular meshes was developed to determine a suitable water diversion scheme.In this model,natural degradation and release of contaminants from sediment are considered and thin plates are used to simulate the dikes in the lakes.The model was calibrated and verified using field data.A typical normal year was selected according to the total diversion volume available from the river and the total runoff into the lakes.To provide a technical support to the water network project,three schemes and their effects in water quality improvement were studied and compared.