蜗形滞流器应用条件试验与模拟

Test and Simulation of Application Conditions of Hydro-brake

为明确蜗形滞流器在排水管网中的应用条件,采用物理模型进行试验,探究蜗形滞流器发挥有效滞流作用的最小压力水头,并建立SWMM雨洪模型,模拟研究加载蜗形滞流器后在不同重现期(3、5、10、20、50年)以及不同降雨历时(1、2和3 h)下研究区域的滞水改善情况。结果表明:蜗形滞流器的滞流效果与相对水头有关,型号为D200R300的蜗形滞流器产生滞流作用的最小相对水头在15 cm左右;总滞水量和滞水时间削减率随着重现期的增大有所减少,且蜗形滞流器对重现期≤10年的降雨具有更好的雨水调控作用,但受降雨历时的影响较小;蜗形滞流器更适宜安装在汇流后下游过水能力不足的管段,在不同降雨条件下削减率能保持在60%以上,最大可达到100%。

In order to clarify the application conditions of hydro-brake in drainage network,the minimum water pressure needed to motivate the rainfall retention capacity was explored by physical model test,a storm water management model(SWMM)was constructed,and the improvement of waterlogging in the experimental area with different rainfall return periods(3 years,5 years,10 years,20 years,50 years)and durations(1 h,2 h,3 h)after the application of a hydro-brake was simulated.The rainfall retention capacity was related to the relative water pressure,and the minimum relative water pressure the D200R300 hydro-brake needed was about 15 cm.The reduction rate of ponding volume and ponding time decreased with the increase of rainfall return periods.The hydro-brake had a better rainfall control efficiency when the return period was less than or equal to 10 years,but the effect was less influenced by rainfall duration.The hydro-brake was more suitable to be installed in the section with insufficient water passing capacity downstream after confluence,in which the reduction rate could be maintained above 60%and up to 100%under different rainfall conditions.