基于SWMM的城市下垫面改变对汇流特性影响研究  

Influence of Urban Underlying Surface Change on Confluence Characteristics Based on SWMM

作　　者：刘灿[1] LIU Can(Chongqing Jiaotng University, Chongqing 400074, China)

机构地区：[1]重庆交通大学,重庆400074

出　　处：《广东水利水电》2021年第9期11-15,共5页Guangdong Water Resources and Hydropower

摘　　要：以产汇流理论为研究基础,调整城市小流域下垫面不透水率,运用SWMM模型模拟重庆市巴南区龙洲湾新区B区,研究该区域在城市化后下垫面变化流域产汇流特性变化规律以及流域的产汇流特性产生动态响应,设计降雨总历时为120 min,暴雨重现期分别为5 a、20 a、50 a、100 a,具体变化情况为已建城市地面不透水率上下变动20%,在不同降雨强度下,各子汇水区域径流系数的变化及排放口流量的改变。On the basis of conventional confluence theory,the impervious rate of urban underlying surface is adjusted to affect the confluence characteristics of urban small watershed.Therefore,this paper analyzed the impact of urbanization on the runoff characteristics of urban small watershed by using the model to simulate the change of runoff concentration and discharge of urban small watershed after urbanization,so as to provide the basis for engineering design and related research.Taking Longzhouwan area B in Banan District of Chongqing as the research object,this paper mainly studied the change of runoff generation and concentration characteristics during urbanization.The SWMM(Storm Water Management Model)was used to simulate the runoff effect of urban small watershed under the condition of rainfall duration of two hours and reappearance period of 5a,20a,50a and 100a respectively.Specifically the change of runoff coefficient and discharge of each subarea under different rainfall intensities when the impervious rate increases by 20%or-20%.

关 键 词：城市小流域 SWMM 下垫面 径流系数 排放流量 

分 类 号：TU992.02[建筑科学—市政工程]