北运河上游流域典型降雨下不同土地利用类型面源污染特征分析

Analysis of non-point pollution characteristics of different land use types under the typical rainfall in the upper North Canal basin

以北运河上游流域为研究对象,选取典型地块开展降雨、径流及其面源污染特征的监测与分析,获取了典型降雨下不同土地利用地块的产流特征,发现农业径流的TN、TP和COD浓度高于村镇用地和林草地,其中农业径流的TP浓度超过了地表水Ⅴ类水限值。研究表明农业面源污染不容忽视,需采取综合有效的污染防控措施。

This paper adopted the upper reaches of North Canal basin as the research object and carried out the monitoring and analysis of rainfall,runoff,and non-point source pollution characteristics on the typical fields.The runoff characteristics of different land use plots under typical rainfall showed that TN,TP,and COD of agricultural runoff were higher than that of rural and forest land.TP concentration of agricultural runoff exceeded the level V limit of surface water quality.Agriculture non-point pollution was important in the upper reaches of North Canal basin,which was necessary to be prevented by integrated management.