基于SWMM模拟的城市内河区域雨水径流和水质分析

利用SWMM模型对城市内河典型区域（清湖周边区域）暴雨径流及水质进行模拟，考查不同重现期和不同透水面积条件下暴雨径流及水质随时间的变化关系。结果表明：随着重现期和透水面积的增大，地表的渗透能力下降，径流总量和径流峰值都增大，增长幅度逐渐减少。而且，污染物浓度，随着重现期和透水面积的增大，都呈现出前期逐渐增大，中期出现峰值，后期逐渐减小的趋势，污染物冲刷效果越明显。重现期小、城市化进程快的区域，地表渗透能力减弱，径流峰值和径流总量上升，洪涝灾害风险加大。

SWMM simulationbased analysis on rainfall runoff and water quality within urban inland river area

Abstract: Based on SWMM（Storm Water Management Model），the storm runoff and water quality in the typical area （around clean water lake）of urban inland river are simulated herein; in which the relationship between storm runoff and water quality as a function of time is examined under the conditions of various return periods and permeable areas.The result shows that the permeability of ground surface is to be decreased，while the total runoff and its peak value are to be increased with the gradual decrease of the increment amplitude along with the increases of both the return period and the permeable area.Moreover，along with the increasing of both the return period and permeable area，the concentration of pollutant presents the trend that it gradually increases in the fore-period，peaks up in the mid-period and then gradually decreases in the late-period with more and more obvious flushing effect of pollutant.For the area with short return period and quick urbanization process，the permeability of ground surface is to be decreased along with the rise of the peak value and total runoff，therefore，the risk of flood and water logging is to be increased as well.