钱塘江河口盐水入侵二维数值模型研究

2D Numerical Simulation on Saltwater Intrusion in the Qiantang Estuary

钱塘江河口盐水入侵研究是钱塘江河口水资源配置和利用的基础.采用荷兰Delft-3D模型的Flow模块,建立了二维水流、盐度数学模型,对富春江电站以下至杭州湾澉浦至陶家路闸断面之间的河段进行了模拟验证计算,利用实测所得潮位、潮流和盐度资料对二维水流盐度模型进行了多次率定、验证.验证的结果相似性较好,表明模型具有一定的模拟能力,且能较准确地模拟研究区域的二维水动力条件;能够较好的反映富春江电站以下至杭州湾澉浦至陶家路闸范围内潮波的传播过程及盐水入侵的情况.

Qiantang River is the longest river in Zhejiang province,famous for strong tide and tidal bore,with a typical estuary with strong tide. The plane of the estuary is a trumpet-shaped area,and as the flow and the tide interact,the intrusion of the saltwater is quite complicated. FLOW module from Delft-3D model built by Delft Water Conservancy Office in Netherlands is adopted,and a mathematical 2D model of flow and salinity is built,to simulate,validate and calculate the reach from Ganpu-Taojialu brake in Hangzhou Bay to Fuchun River plant,and the actual information of the tide level,the tidal wave and the salinity is utilized to rate and validate the mathematical 2D model of flow and salinity over and over again. The result is quite good,which indicates that the model has a capability of simulation,and can exactly simulate the 2D dynamical conditions of the studied area,and well reflect the wave transmission and the saltwater intrusion in the reach from Ganpu-Taojialu brake in Hangzhou Bay to Fuchun River plant.