生态护岸面源污染物截污效率简化计算模型

Simplified Calculation Model of Non-Point Source Pollution Removal Efficiency by Ecological Embankment

生态护岸面源污染物截污效率的量化研究对生态护岸建设和管理具有重要的意义,为此,定义了生态护岸截污效率概念并建立了其简化计算模型,同时,利用常熟地区不同下垫面条件下的人工降雨模拟试验,进一步分析得到了模型中降雨径流污染物浓度、降雨径流含沙量,径流泥沙所吸附的污染物质量浓度的经验公式,最后应用该模型对常熟市金泾塘河道治理中拟采用的梯级潜流式生态护岸进行了截污效率计算,结果显示:利用该模型计算的新型生态护岸综合截污效率达到了75.4%,和试验数据基本一致;作为一种护岸环境效益的量化分析方法,模型的建立具有明显的工程意义。

Quantitative study of non-point source pollution removal efficiency is of significance in effective management of ecological embankment construction. Therefore,this work put forward a new concept of pollution removal efficiency of ecological embankment and the simplified calculation model. Meanwhile,several empirical formulas of key variables in this model were deduced based on the rainfall simulation tests under different ground cover in Changshu City,including pollutant concentrations in runoff water,sediment concentrations in runoff water and pollutant mass concentrations of sediment in runoff water. As one case study for the ecological embankment with a gradient and subsurface treatment system used for Jinjingtang River in Changshu City,the results showed the comprehensive pollution removal efficiency could reach 75. 4%,which was in good agreement with experimental data. As a kind of quantitative analysis method of environmental benefits of ecological embankment projects,the establishment of the model had obvious engineering significance.