基于隐格式水动力模型的庄河养殖海域污染物运动轨迹的数值模拟

基于非结构四叉树矩形网格,建立了近岸海域深度平均二维隐格式水动力数学模型,通过耦合拉格朗日粒子追踪法和粒子云团随机走动原理计算水体污染物的运动轨迹。水动力数学模型采用有限体积方法离散方程,使用Rhie-Chow的动量插值方法对同位网格不合理的压力波加以抑制,并使用SIMPLEC程式导出水位校正方程。通过对"工"字型理想海湾的水动力、风与流共同作用下正方形海湾的油膜输移及扩散状况进行模拟验证后,将该模型应用于计算北黄海庄河养殖海域的水动力特性以及污染物在海中的输移过程和运动轨迹,最后给出该海域模拟期间的污染物运移规律。研究结果对庄河养殖海域的水环境管理有重要的意义。

Numerical simulation of movement track of pollutant for Zhuanghe breeding sea area based on implicit hydrodynamic model

Based on the unstructured quadtree rectangular grid,the paper built a depth-averaged 2D hydrodynamic model with implicit scheme.It calculated the movement track of pollutant of water body through Lagrangian method and random walk principle.The hydrodynamic model used the finite volume method and non-staggered system with the Rhie and Chow's interpolation to eliminate the checkerboard pressure problem.The SIMPLEC algorithm on non-staggered grid was used to derive the water level correction equation. The coupling model was tested by hydrodynamic of idealized estuary,oil slick transport under the effect of wind and flow.The mode was also used to calculate the hydrodynamic characteristics of north yellow sea Zhuanghe breeding waters and the transport process and trajectory of pollutant in sea. Finally,it gave the transport rule of contaminant in the simulated area.The research result has important significance for the water environment management of Zhuanghe breeding sea area.