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透水混凝土路面作为低影响开发技术之一,对雨洪的管理与控制具有重要作用。对透水混凝土路面对径流的控制作用进行试验,结果表明:基于设计路面和北京降雨参数,降雨历时分别为30,60,120 min时,透水混凝土路面对径流总量的削减率分别达到60%、55%和40%以上,对洪峰流量的削减率分别达到65%、63%和40%以上;降雨重现期从1年增到100年,产流延迟时间从13 min降至5 min。试验表明,透水混凝土路面的雨量径流系数在0.18~0.54,远小于普通混凝土路面的雨量径流系数0.91。结果表明,透水混凝土路面对延迟产流时间、削减径流水量、削减洪峰流量以及降低径流系数具有很好的作用,可以为该低影响开发技术在国内的应用设计提供参考。
Permeable concrete pavement as one of the low-impact development technologies plays an important role in storm flood management and control. Experimental results show that the reduction of total runoff of pervious concrete pavement is 60% when the rainfall duration is 30, 60 and 120 min respectively based on the designed pavement and Beijing rainfall parameters. 55% and 40%, respectively. The reduction rates of flood peak flow rate reached 65%, 63% and 40% respectively. The rainfall recurrence period increased from 1 year to 100 years and the production flow delay time dropped from 13 minutes to 5 minutes. The test shows that the runoff coefficient of pervious concrete pavement is 0.18-0.54, which is far less than that of common concrete pavement 0.91. The results show that the pervious concrete pavement has a good effect on the delay of run-off time, the reduction of runoff water flow, the reduction of peak flow and the reduction of runoff coefficient, which can provide a reference for the design of this low-impact development technology in China.