透水路面与生物滞留组合系统的径流体积控制效能
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摘要
透水路面与生物滞留组合系统为典型的低影响开发雨水控制设施,通过实验室人工模拟降雨,对道路1%横、纵坡条件下透水路面与生物滞留组合系统的径流雨水体积控制效能进行了研究。结果表明,变径流系数法-等流时线法更适合试验条件下透水路面的产汇流理论计算;随着降雨重现期由1年增加至20年,透水路面的径流雨水体积控制率由30. 69%降低到10. 21%;高降雨重现期下组合系统增加蓄水层深度对雨水体积控制率的改善效果不如低降雨重现期下显著;随着降雨重现期由3年增加至20年,组合系统中生物滞留设施对雨水体积控制率的贡献比例从71. 56%增加至86. 31%;当组合系统中滞留带蓄水层深度为15 cm时,10年和20年重现期下的雨水体积控制率为75. 73%和74. 59%,径流雨水控制效果较好;影响组合系统雨水体积控制率的主要因素相关性排序为蓄水层深度>降雨量>峰值雨强。
The combined system of pervious pavement and bioretention is a typical low impact development facility. The runoff volume control efficiency of a road with 1% horizontal and longitudinal slope by the combined system was explored through the simulated rainfall experiments. The results showed that variable runoff coefficient method-isochrone method was more suitable for theoretically calculating the runoff yield and confluence of the pervious pavement under the experimental condition. As the rainfall return period increased from one year to twenty years,the runoff volume control rate of pervious pavement decreased from 30. 69% to 10. 21%. The improvement effect on the runoff volume control rate by increasing the depth of the water ponding area in high rainfall return period was not as significant as that in low rainfall return period. With the increase of rainfall return period from three years to twenty years,the percentage of bioretention in the combined system contributed to the runoff volume control rate increased from 71. 56% to 86. 31%. When the depth of the water ponding area was 15 cm,good runoff control efficiency was achieved with the volume control rates of 75. 73% and 74. 59% under10-year and 20-year return periods. The correlation sequence of the main factors affecting the runoff volume control rate by the combined system was the depth of water ponding area > rainfall > peak rainfall intensity.
The combined system of pervious pavement and bioretention is a typical low impact development facility. The runoff volume control efficiency of a road with 1% horizontal and longitudinal slope by the combined system was explored through the simulated rainfall experiments. The results showed that variable runoff coefficient method-isochrone method was more suitable for theoretically calculating the runoff yield and confluence of the pervious pavement under the experimental condition. As the rainfall return period increased from one year to twenty years,the runoff volume control rate of pervious pavement decreased from 30. 69% to 10. 21%. The improvement effect on the runoff volume control rate by increasing the depth of the water ponding area in high rainfall return period was not as significant as that in low rainfall return period. With the increase of rainfall return period from three years to twenty years,the percentage of bioretention in the combined system contributed to the runoff volume control rate increased from 71. 56% to 86. 31%. When the depth of the water ponding area was 15 cm,good runoff control efficiency was achieved with the volume control rates of 75. 73% and 74. 59% under10-year and 20-year return periods. The correlation sequence of the main factors affecting the runoff volume control rate by the combined system was the depth of water ponding area > rainfall > peak rainfall intensity.
引文
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