中文摘要：

农田径流是面源污染的重要来源之一,而径流中的泥沙和水是携污的两大介质。选取常熟金泾塘地区典型农用地为研究对象,通过人工降雨研究不同降雨强度下径流中泥沙和水的携污比例,并根据该比例特征设计出一种梯级潜流式生态护岸;通过实验研究了该护岸形式对TP、TN和泥沙的去除率,计算了护岸综合截污效率。研究结果表明：农田径流中泥沙携污量大于水的携污量;考虑护岸截留泥沙而去除的污染物量,护岸对不同降雨强度径流中TP、TN的综合截污效率均可达90%和70%以上。

英文摘要：

Farmland runoff is one of the most important resources of non-point source pollution.Sands and water in the runoff are the media of carrying pollutants.In this paper,the proportion of pollutants carried by sand and water in the farmland runoff,is studied by simulating different intensities of rainfall,and according to the proportion,a multi-step underflow revetment is designed to filter the TP,TN and sand in the runoff.The results show that the amount of pollutant carried by sand is far more than that of water,and considering the interception of the pollutant carried by sands,the efficiency of TP and TN interception by the ecological revetment can be more than 90% and 70%.