【摘要】 快速的城市化发展改变了原有的城市下垫面结构,不透水率的增加给城市防洪造成了巨大的压力,研究不透水率对城市产汇流的影响在防治城市内涝、合理开发利用雨洪资源等方面均具有重要意义。以沈阳市满融经济开发区为例,运用SWMM模型,研究不同重现期的降雨条件下不透水率与城市地表产汇流的关系。结果表明,不透水面积的增加使区域径流量增多、洪峰流量增大、峰值时间提前;在不同的降雨条件下,径流系数和洪峰流量均与不透水率呈正相关的线性关系,R2均在0.9以上;增加降雨强度,会使不透水率对径流系数的作用效果逐渐减弱,而洪峰流量的作用效果会随之增强。更多还原

【Abstract】 Rapid urbanization has changed the original underlying surface of the city,and the increase in the rate of impervious surface has caused great pressure on the city’s flood control.It has great significant for prevention of urban water logging and utilization of rain-flood resources to study on the effect of impervious surface ratio on runoff yield and concentration.Taking Manrong Economic Development Zone in Shenyang City for an example,the SWMM model was used to study the relationship between the impervious surface ratio and runoff yield and concentration under different rainfall return periods.The results show that the increase of the rate of impervious surface causes runoff and peak flow to be increased,and makes the time of peak flow advance.Under different rainfall conditions,both runoff coefficient and peak flow have positive correlation with impervious surface ratio,and the value of R2 is greater than 0.9.With the increase of rainfall intensity,the effect of impervious surface ratio on runoff coefficient is gradually weakened,but the effect of impervious surface ratio on peak flow is enhanced.更多还原