以南昌大学前湖校区为例，利用SWMM模型对其进行水质模拟。通过使用实测降雨数据对该模型进行参数率定，论证了该模型能够较真实地模拟出本地区降雨径流非点源污染的特性。在此基础上，通过SWMM模型设计了不同的重现期、雨峰系数、前期干旱天数等气象条件，以此来分析雨水径流中的TSS、CODcr、TN和TP等污染物浓度随降雨历时的变化过程。结果表明：①随着重现期增大，污染物浓度峰值变大，峰值出现的时间提前；②随着雨峰系数的增大，污染物浓度峰值变大，峰值出现的时间延后；③前期干旱天数只会影响污染物的浓度峰值和前期浓度增长趋势，对峰值出现的时间没有影响。
Abstract
Taking the Qianhu campus of Nanchang University as an example, the swmm model was used to simulate the water quality.The parameters of the model are confirmed by using the measured rainfall data.It is proved that the model can simulate the characteristics of non - point source pollution of rainfall runoff in this area.On the basis of this, the swmm model was used to design the meteorological conditions such as different reproduction period, rain peak coefficient and early drought days, so as to analyze the concentration of TSS, CODcr, TN and TP in rainwater runoff with rainfall transformation.The results show that: (1) With the increase of the reproduction period, the peak value of the pollutant concentration becomes larger and the peak appears in advance; (2) With the increase of the rain peak coefficient, the peak concentration of the pollutant becomes larger and the peak time is delayed;(3) The number of days before the drought will only affect the peak concentration of pollutants and pre-concentration growth trend, there is no impact on the peak time.
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