耦合高效高精度水动力模型的多组分污染物输移及衰减反应模型

为更好地模拟水污染事件中多组分污染物输移及衰减反应过程,全面耦合了基于图形处理器(GPU)加速技术的二维水动力模型与多组分污染物输移及衰减反应模型,通过改进模型源代码并在污染物输移控制方程中嵌入衰减项与反应项,建立了一个可应用于大区域复杂地形河道洪水演进全过程及多组分污染物输移和衰减反应的高性能耦合模型,同时引入GPU技术提升计算效率。将耦合模型应用于理想地形静水和两个复杂地形河道入流与溃坝算例的水质模拟,结果表明:多组分污染物输移及衰减反应过程在理想算例中的数值解与解析解基本吻合,在入流与溃坝算例中的模拟结果符合实际物理过程,模型运行速度快且计算效率高,可高效地模拟各类突发水污染事件并进行预警和评估。

Multi-component pollutant transport and attenuation reaction model coupled with high-efficiency and high-precision hydrodynamic model

In order to better simulate the multi-component pollutant transport and attenuation reaction process in water pollution events, a two-dimensional hydrodynamic model based on the graphics processing unit(GPU) acceleration technology was fully coupled with the multi-component pollutant transport and attenuation reaction model. By improving the model source code, an attenuation term and a reaction term were embedded in the pollutant transport control equation. The high-performance coupling model can be applied to the whole process of flood evolution in rivers with complex terrain features in a large area and multi-component pollutant transport attenuation and mutual reaction processes. The GPU technology was used to accelerate calculation. The coupling model was applied to a static water case with an ideal terrain, river inflow with a complex terrain, and dam break with a complex terrain. The results show that the numerical and analytical solutions of the multi-component pollutant transport and attenuation reaction process in the ideal case are basically consistent. The results in the inflow and dam break cases are in line with the actual physical processes, and the model runs fast with high calculation efficiency. Thus, the model can be used to simulate accidental water pollution incidents reasonably and efficiently and conduct early warning and assessment.