辽东湾氮、磷和COD环境容量的数值计算

一个原始方程海洋环流模式(POM)被用来模拟辽东湾环境动力场,同时用有限容积方法对描述氮、磷、COD等污染物输运过程的对流扩散方程进行离散,提高了计算精度和效率。通过对仙人岛海域四个采样点的实测浓度和相应点上的计算浓度的比较分析,并结合试验数据确立了适合辽东湾污染物浓度研究的降解系数;在此基础上进一步对各种污染物进行为期一年投放的数值实验,初步估算了各种污染物在辽东湾的保有容量、经过开边界的交换率以及非保守过程(磷、COD)的削减率。

Numerical Calculation on the Content of Nitrogen, Phosphate and COD in the Liaodong Bay

A primitive equation ocean circulation model was used to simulate the dynamical environment of Liaodong Bay; meanwhile, the Finite Volume Method was adopted to disperse the advection-diffusion equation describing the transport of nitrogen, phosphorous and COD. By comparing our computed results with the observed concentration at four sampling sites near the Myth Isle and referring to the laboratory experiment data, we determined the decomposition speed concerning individual pollutant. Furthermore, a numerical experiment in which pollutants were thrown in the sea continuously up to one year was performed, and the standing content of above pollutants in the Liaodong Bay, their exchanging rate through open boundaries and the decomposing rate of phosphate and COD were estimated.