南京市三汊河河口闸单孔开启水流流态模拟研究

Simulation on flow pattern of Sanchahe estuary sluice under single hole opening in Nanjing City

为模拟南京市三汊河河口闸附近水流流态,探究河口闸单孔开启的可行性,采用Delft 3D软件建立大范围水深平均模型和局部三维数学模型,对三汊河河口附近水流流态进行数值模拟,研究最不利水位工况下的水流流态,并确定了闸孔不同运行模式对流速分布的影响范围。进一步地,将河道底面流速与研究范围内泥沙起动速度进行比较,获得了河口闸附近河道冲刷与淤积范围的分布情况。研究成果可为研究河口闸单孔开启提供依据。

In order to simulate the flow pattern near the Sanchahe estuary sluice in Nanjing City and explore the feasibility of opening a single hole of the sluice,Delft 3D software was used to establish a large-scale water depth average model and a local three-dimensional mathematical model.Then the flow pattern near the Sanchahe estuary sluice was numerically simulated,the flow pattern under the most unfavorable water level condition was studied,and the influence range of different operation modes of the sluice on the velocity distribution was determined.Furthermore,by comparing the flow velocity at the bottom of the river with the sediment incipient velocity in the study area,the distribution of the deposition-erosion range of the river near the estuary gate was obtained.The research results can provide a basis for the study of single hole opening of the estuary sluice.