外河水位顶托下雨水管网排水能力变化的SWMM模拟

Simulation of changes of drainage capacity of rainwater pipe network caused by the jacking of outer rivers

以沈阳市和平区雨水管网系统为例,选取芝加哥雨型为设计雨型,利用SWMM,模拟分析了不同暴雨重现期和外河设计洪水位下的雨水管网系统排涝过程。结果表明:随着降雨重现期增大,雨水管网排水能力增加,但积水程度加重;雨水管网系统有效排涝系数随着降雨重现期的增大而减小,且在高重现期时变化程度减缓;雨水管网系统总排水能力与外河水位和各节点(雨水井)的平均落差呈显著正相关,相关系数R为0.992,并呈近似线性关系;泵站排水在淹没出流地区至关重要,本例中可提升36.3%的管网系统排水能力,而对于自由出流地区,泵站对系统排水能力基本没有贡献。

Taking the rainwater pipe network system of Heping District in Shenyang as an example,the Chicago rain type is selected as the design rain type,and the SWMM is used to simulate the drainage process of the storm water pipe network system under different heavy rainfall recurrence periods and out-river design flood levels. The results show that with the increase of rainfall recurrence period,the drainage capacity of rainwater pipe network increases,but the degree of waterlogging increases. The effective drainage coefficient of rainwater pipe network system decreases with the increase of rainfall recurrence period and the degree of change slowed down at high recurrence period. There is a significant positive correlation between the total drainage capacity of the network system and the difference between the river water level and the average ground elevation of manholes and the correlation coefficient R is 0. 992,and it shows an approximate linear relationship. Pumps are essential in districts where submerged discharge occurs potentially. In this case,the pump enhances the drainage capacity of the pipe network system by 36.3%,while for the free flow area,the pumping station may not contribute to the drainage capacity of the system basically.