基于SWMM的宿迁市非点源污染负荷模拟计算

以宿迁市中心城区非点源污染为对象,基于SWMM模型,根据降雨径流实测数据并结合相关经验参数率定模型参数,构建了基于SWMM模型的研究区非点源污染负荷计算模型,共设计了7种不同降雨情景,分析了不同降雨条件下研究区非点源污染固体悬浮物(TSS)、COD、TN、TP的入河污染物总量和入河过程线。在设计的降雨情景下:(1)在一定的降雨强度范围内,入河污染物总量随降雨强度增加而增加,高强度降雨较低强度降雨可对受纳水体造成更大的污染;(2)污染物浓度峰值出现在降雨45~50min内;(3)入河TSS、COD体现了明显的初期效应,而TN、TP没有明显的初期效应,这与氮磷的再次堆积有关。

The Simulation of Non-Point Source Pollution Load based on SWWM in Suqian

The study was focused on the non-point source pollution loading in Suqian. Based on the SWMM,parameters from the literature and field experiments were integrated,and a non-point source pollu?tion calibration model was constructed .Seven different rainfall scenarios were designed to analyze the pollu?tion loads of total suspended solids(TSS). Under the designe rainfall conditions:(1)In a certain range of rainfall intensity,total non-point pollutants increased with the increase of the rainfall intensity,higher-inten?sity rainfall caused more serious pollution to receiving water bodies than the low-intensity rainfall did;(2) The emission of pollutants reached a peak after 45~50min late than the beginning of the rainfall;(3)TSS and COD emissioned into the river reflects obvious first flush effect,however,TP and TN didn’t reflect ob?vious first flush effect and this may relate with the second accumulation.