SWMM模型应用于城市住宅区非点源污染负荷模拟计算

以温州市典型住宅区非点源污染为对象,基于SWMM(storm water management model)模型的模拟机理,借鉴国内外相关研究的模型参数,结合降雨径流实测数据率定模型参数,将模型"本地化",构建了基于SWMM模型的研究区非点源污染负荷计算模型,并设计了4种不同降雨情景,分析在不同降雨条件下研究区非点源污染固体悬浮物(TSS)、CODCr、TN和TP的污染负荷量及其累积变化过程.结果表明,构建的SWMM模型的模拟值可以较好地与实测值相吻合,4种污染物模拟的相对误差均小于10%.在设计的4种降雨情景下:①污染物浓度峰值出现在降雨30～40 min内,降雨强度越大,出现浓度峰值的时间越早;②高强度降雨较低强度降雨可对受纳水体造成更大的污染. 

Application of SWMM in the Simulation of Non-Point Source Pollution Load in Urban Residential Area

This study was focused on the non-point source pollution loading in a typical urban residential area in Wenzhou City,Zhejiang Province.Based on the SWMM principle,parameters from the literature and field experiments were integrated,and a non-point source pollution calibration model was constructed.Four different rainfall scenarios were designed to analyze the pollution loads and the accumulation process of total suspended solids(TSS),chemical oxygen demand(CODCr),total nitrogen(TN) and total phosphorus(TP).The results showed that the simulated data matched the field-monitored data satisfactorily.The relative errors between the simulated and the true values of all the four parameters were less than 10%.Under the four rainfall conditions: 1) the highest concentrations of the pollutants were observed within 30-40 minutes;the heavier the rain,the earlier their highest concentrations appeared;2) higher-intensity rainfall caused more serious pollution to the receiving water bodies than the low-intensity rainfall did.