降雨和生态补水对李村河污染物输运影响研究

Study on the effects of rainfall and ecological water supplement on the pollutant transport in Licun River

我国北方河流多为季节性河流,水质水量受降雨径流影响显著。近年来,许多河流实施了生态补水措施,研究降雨和生态补水情形下河流的水质水量变化规律,对水资源利用和河流生态修复具有重要的意义。基于城市暴雨径流管理模型(SWMM)和环境流体动力学模型(EFDC),本文研究了青岛市李村河及其流域的水质水量变化规律。结果表明:河流下游,大雨期间COD浓度达到130 mg/L,小雨期间COD浓度达70 mg/L;降雨过程后期,雨水对河流污染有一定的净化作用;雨水和生态补水的汇入导致河流的水体交换加快,物质输运时间缩短,大雨情形下的物质输运时间比小雨情形的缩短约一天。

Due to the seasonal characteristics of rivers in northern China,the water quality and quantity in rivers are significantly affected by rainfall runoff.In resent years,many rivers implement ecological water supplement measures.It is of great significance for water resources utilization and river ecological restoration to study the variation law of river water quality and quantity under the condition of rainfall and ecological supplement.In this paper,based on the Urban Storm Runoff Management Model(SWMM) and the Fluid Dynamics Code(EFDC) model,the water quality and quantity in Licun River and in its basin were simulated.The main results are as follows:(1) Taking the Chemical Oxygen Demand(COD) as an example,the COD concentration reaches 130 mg/L during heavy rain and 70 mg/L during light rain in the downstream of the river.(2) The rainwater in the later stage of rainfall has a certain purification effect on the pollution in the river.(3) The inflow of rainwater and supplemented water lead to the acceleration of water exchange and the shortening of material transportation time.The material transport time under the condition of heavy rain is about one day shorter than that under the condition of light rain.