河口盐水入侵垂向二维数值计算

Vertical Two-Dimensional Numerical Model of Salt Intrusion in Tidal Estuarics

为描述潮汐河口盐水入侵特性而建立了垂向二维数学模型.数值计算格式采用帕坦卡和斯波尔丁提出的控制体积法,并以幂函数格式作为对流扩散项的离散格式.以长江口南槽实测资料作为计算验证,潮流,盐度和潮位的计算结果与实测值相比,吻合良好.由于模型所使用的数学方程组有一定的普遍意义,所以将方程中的盐度改为其它物质浓度,原则上也可应用于悬沙或污染物质输运扩散的垂向二维的数值模拟计算.

To describe the characteristics of salt intrusion in tidal estuaries, a numerical model is established for vertical two-dimensional unsteady flow. The solution is based on the Control Volume Method (CVM) presented by S. V. Patankar and D. B. Spalding. Power-Law schene is adopted for the discrete convection and diffusion term. Furthermore, as an example, the model has been verified with the field data of tidal height, current and salt distribution obtained from the South Chnnel of the Yangtze Estuary. The results are satisfactory. The numerical model is of universality and it can be used in principle the vertical two-dimensional numeration of suspended sand or pollutants if salinity is replaced by concentration of other materials in the equations.