柯桥主城区清水工程河网湖泊水动力二维数值模型分析

Analysis on 2-D Numerical Model of Hydrodynamic Force for River Networks and Lakes in Keqiao

瓜渚湖清水工程水流的流动传播特性,使水流流入流出瓜诸湖的时间位置不同,流速水位也不同,湖泊水动力特性呈现出复杂性.根据清水工程河网湖泊水动力二维数学模型的计算成果,分析了瓜渚湖及其周围河网之间水流的相互制约关系,及其呈现的低流速区域等复杂的水动力特性.根据水动力特性,提出了水系连通、河道拓宽和在瓜诸湖岸边设置观赏坝、观赏岛、设置水闸等导控设施,控导水流加快水体置换率等工程措施.

Because of its special flowing and transmission characteristics of Guazhu Lake, many factors about Guazhu Lake, such as the different time of inflow and runoff, the different flow velocity and water level, make the hydrodynamic character- istics of the lake water complex. According to the 2-D mathematical model calculating results of the river networks hydrody- namic force in Keqiao Clean-water Project, the mutual restriction relation of water flow between Guazhu Lake and the sur- rounding river networks is analyzed, as well as the other complex hydrodynamic characteristics, such as low velocity area. According to the hydrodynamic characteristics, some control measures as well as some engineering measures are put for- ward, including river system connection, channel widening, and the construction of ornamental dam, ornamental island and sluices, therefore, to speed up the water exchange rate.