基于非恒定流的污染物迁移扩散随机模拟

Random simulation of migratory diffusion of pollutants based on unsteady flow condition

针对目前大部分河流都受到不同程度污染的现状,研究了基于非恒定流的污染物迁移扩散随机模拟方法。通过一维非恒定流数值计算和流场模拟,得到了水库开闸放水后下游各个断面的水位、流量、流速等数据,并以此为基础,利用蒙特卡洛法对水库开闸放水前后下游典型断面的COD和NH3-N等进行污染物迁移扩散随机模拟,并将模型应用于文峪河下游。结果表明,文峪河水库开闸放水后,COD和NH3-N的污染带长度和宽度均有不同程度的减小,污染带向排污一侧岸边集中。研究成果可为解决河流污染现状与水库调度提供参考。

Based on the condition that most rivers are polluted in different degree at present, the author studied the method of random simulation of migratory diffusion of pollutants with unsteady flow theory in the paper. Through nu- merical calculation of one-dimenlsional unsteady flow field simulation, the data of water level, flow rate and velocity in typical sections of downstream was obtained for the case in which the reservoir gate was opened. Based on this, the diffusion of pollutants COD and NH3 - N in typical sections of downstream before and after the reservoir gate opening was simulated rendomly by the Monte Carlo method, and then the model was applied to the downstream of Wenyu River. Results show that after the reservoir is opened, the length and width of COD and Nit3 - N pollution zone would decrease in different degrees, and pollution zone would concentrate into the blowdown bank side. The results can provide reference to reducing river pollution and improving reservoir operation.