长江江苏段二维水流-水质模拟

根据长江江苏感潮河段水流水质及地形特点，应用有限体积法及黎曼近似解建立了平面二维水流-水质模型。模型应用有限体积法的积分离散，并利用通量坐标旋转的不变性把二维问题转化为一系列局部的一维问题进行求解，采用通量差分裂格式计算各跨单元边界的水量、动量及污染物输运等通量。应用浓度输移精确解验证模型算法的正确性，利用长江江苏感潮河段的水流、水质监测资料进行模型率定检验，并通过对卫星遥感资料的分析检验模型计算污染带的合理性。模型在长江江苏段主要地区区域供水规划及实施决策支持系统中得到应用，为该江段水质规划提供依据。

2-D depth averaged flow pollutions model for Jiangsu reaches in Yangtze River

A 2 D depth averaged flow pollution model using the finite volume method(FVM) with approximate Riemann solvers for tidal reaches of Yangtze River is established.Based on the rotational invariance property of the flux,the 2 D simulation is transferred into solving a series of local ID problem with FVM.The Riemann solver,flux difference splitting(FDS),is employed to estimate the numerical normal flux of variables including flow,momentum and pollutant concentration across the interface between cells.The model has been examined by exact solutions and verified by observation data.The calculated results well match both exact solutions and observation.In addition,the remote sensing technology is adopted to confirm the validity of the simulated pollution area.