基于POM的近海三维水质模型

Three dimensional water quality model based on POM at inshore region

建立基于POM的近海三维水质模型,考虑到基本方程的选用、边界条件的确定及动边界的引入等。以理想水槽中连续源排放的浓度场预测为例,分别采用中心差分格式、迎风格式与Smolarkiewicz迎风格式分析水质模型的精度。三种格式的计算误差均小于20%,其中Smolarkiewicz迎风格式离散对流项,能有效降低计算中的数值耗散,同时避免中心差分格式产生的物质反向传播等失真现象,更适合于近海水域的水环境模拟及污染物浓度预测。

3D water quality model based on POM was considered controlling the equations,boundary condition,and moving boundary.The mass transport equation is described with the central scheme,upwind scheme,and Smolarkiewicz upwind scheme to predict the concentration distribution of continue source in three dimension flume,and to analyze the numerical results of three schemes.It shows that the errors between simulated values of three schemes and precise values are less than twenty percent.The numerical solutions of Smolarkiewicz upwind scheme reduce the numerical diffusion effectively and are positive definite.Therefore,the water quality model based of Smolarkiewicz upwind scheme is appropriate for water quality forecasting in inshore region.