无结构网格二维潮流模型的开发及应用

Development and Application of a 2D Tidal Flow Model with an Unstructured Mesh

摘要:

基于无结构网格的半隐海洋环流模型——“类UnTrim (unstructured grid version of trim)模型”开发了一个二维潮流数学模型.模型在平面上采用无结构三角网格,并采用二维浅水方程作为控制方程.利用水槽试验对模型的潮流模拟和干湿判别进行了验证,验证结果显示模型是稳定可靠的.将模型用于长江口的水动力过程模拟,并利用实测水文资料对模型进行了率定和验证计算.结果表明,模拟结果与实际情况一致.

Abstract:

A two dimensional tidal flow numerical model is developed based on models like UnTrim type.The model takes the two dimensional shallow water equations as governing equations and uses unstructured triangular mesh on horizontal plane to enhance the efficiency and accuracy of computation.Then the simulation of tidal flow and the wetting and drying is verified by several channel tests.The results show that the model is effective and stable.Then the model is applied to the simulation of the hydrodynamic process in the Yangtze Estuary,and the model is calibrated and validated through the observed field data.The result shows a good agreement between the simulation and computation.