基于水动力和生物多样性的瀛湖湖底形态研究

摘要

瀛湖为上海市崇明岛一待建的人工湖,为了形成合适的水动力条件,达到改善并维持良好湖泊水环境的目的,分析并设计了瀛湖湖底造型. 基于Delft-3D模型,结合湖区的平面形态,建立了瀛湖的三维水动力模型. 利用所建立的模型计算出湖泊风生流三维流场,并根据计算结果分析了湖区的分层水流流态、流速大小,从水动力的角度结合生物多样性要求论证了湖底地形设计的合理性,为该工程的设计及今后的运行提供了理论依据.%Yinghu Lake is a planned lake on Chongming island of Shanghai. To create a favorable hydraulic dynamic condition for the improvement and maintenance of sound water environment, the bottom geography of Yinghu Lake is analyzed and de-signed. In the combination of the flat form of the lake bottom and by using Delft-3D model, a 3D hydraulic dynamic model of Yinghu Lake is developed, which is used to calculate the wind-driven 3D flow field. On the basis of the calculation results, the stratum flow state and flow velocity are analyzed and the rationality of the lake bottom form design are verified in the terms of hy-draulic dynamics and biodiversity. It provides basis for the design and future operation of the lake.