基于HEC-RAS的鹿溪河流域水质治理效果研究

Study on Water Quality Control Effect of Luxi River Basin Based on HEC-RAS

为改善流域水环境、维护生态健康、探讨生态修复措施效益,以鹿溪河流域为研究区,针对其NH3-N、TP浓度较高的水环境现状,提出5类水环境治理与生态修复措施,并应用HEC-RAS软件建立了一维水动力水质模型,模拟分析了5类水环境治理与生态修复措施在两种工况下对2030年水环境质量的改善效果。结果表明:措施实施后,NH3-N和TP的削减率可达到95%和93%;在两种工况下的水质改善效果均十分显著;河道枯水期流量较小时,污染物的浓度会升高,建议鹿溪河在枯水期时实施引水工程。

In order to improve the water environment of the river basin, maintain the water ecological health and explore the benefits of ecological restoration measures, taking Luxi river basin as the research area, according to the current situation of water environment with high concentration of NH3-N and TP, five kinds of water environment treatment and ecological restoration measures are put forward in this paper. The software of HEC-RAS is applied to establish a one-dimensional hydrodynamic water quality model. The effects of five types of water environmental governance and ecological restoration measures on the improvement of water environmental quality in 2030 under two working conditions are simulated and analyzed. The results show that the reduction rates of NH3-N and TP could reach 95% and 93% respectively after the implementation of the measures. The water quality improvement effect under the two working conditions is very significant. When the river flow is small in the dry season, the concentration of pollutants will increase. It is suggested that Luxi river basin should carry out water diversion project during the dry season.