基于SWMM的透水铺装系统的水文效应研究

为分析透水铺装对城市水文循环的影响,以河北农业大学校区内某2.02ha的区域为研究区,分别建立研究区现状和加入透水铺装措施的暴雨洪水管理模型(SWMM),采用纳什效率系数法对模型进行率定和验证,定量分析不同重现期降雨情景下,透水铺装对研究区现状产汇流的影响。结果表明,模型率定和验证期的纳什效率系数分别为0.87、0.83和0.89、0.81,构建的研究区雨洪模型模拟效果良好。不同重现期(2、5、10、50、100年)降雨条件下,透水铺装对研究区现状产流时间推迟1～15min,径流总量削减23%～51%,洪峰流量削减28%～56%,峰现时间滞后1～10min。研究成果有利于透水铺装设施的进一步开发应用。

Study on Hydrological Effect of Permeable Pavement System Based on SWMM

In order to analyze the influence of pervious pavement on urban hydrological cycle, a 2.02 ha area in the campus of Hebei Agricultural University was taken as the research area, and storm flood management models (SWMM) with pervious pavement measures were established. The model was calibrated and validated by Nash efficiency coefficient method, and different recurrence periods were quantitatively analyzed. Under the rainfall scenario, the influence of permeable pavement on the present situation of runoff and runoff was studied. The results show that the Nash efficiency coefficients are 0.87, 0.83 and 0.89, 0.81 in the calibration and validation periods, respectively. The simulation results of the rain-flood model in the study area are good. Under rainfall conditions of different recurrence periods (2, 5, 10, 50, 100 a), pervious pavement delayed current runoff generation time by 1-15 minutes, reduced the total runoff by 23%-51%, reduced the peak flow by 28%-56%, and delayed the peak time by 1-10 minutes. The research results are conducive to the further development and application of pervious pavement facilities.