二维稳态河流水质模型的河岸镜像问题及其计算机模拟研究

基于二维稳态河流水质模型的河岸镜像问题，采用计算机模拟河流污染带的方法，对一侧镜像模型和两侧镜像模型进行了分析讨论。根据湖南省澧水某段枯水期的水文参数，对一侧镜像模型和两侧镜像模型的污染带进行了模拟，发现一侧镜像模型由于忽略了一个虚源而使河流中污染物的浓度分布产生较大的误差，从而导致污染带异常；而两侧镜像模型考虑了河岸两侧的两个镜像虚源，从而很好的反映河流中的污染物浓度分布。因此在河流水质预测评价过程中，应采用两侧镜像的二维水质模型。

The Mirror Phenomenon of Two-dimension Steady River Water Quality Model and its Computer Simulation Research

The mirror phenomenon of two-dimensional steady river water quality model was studied with the computer simulation of river pollution straps. The pollution straps of one-side mirror model and two-side mirror model were simulated and compared by using the hydraulic parameters of the Lishui River in Hunan Province. The results show that the one-side mirror model produce great errors due to ignorance of a mirrored source while the two-side mirror model, which take into account the two mirrored sources on both sides of the bank, can reflect the pollutant concentration. Therefore, we should use the two-side mirror model in predicting and accessing river water quality.