生物滞留带结构层参数对道路径流滞蓄效应影响

发布时间：2018-01-27 09:21

本文关键词： 生物滞留带道路径流结构层参数径流调控滞蓄效应　出处：《水科学进展》2017年05期 　论文类型：期刊论文

【摘要】：基于非饱和土壤水分运动理论,采用数值模拟方法研究了4种降雨作用下生物滞留带结构层参数对设施积水、产流及径流调控效应的影响特性。结果表明:生物滞留带表层积水受蓄水层深度影响显著,随蓄水层深度由20 cm增加到30 cm,设施的溢流控制水量平均提高0.196 m3左右,但积水时长增加可达85 min;生物滞留带各结构层参数对穿孔管产流均有一定影响,随种植土层与砂滤层厚度比或内部储水区高度增加,穿孔管产流时刻推迟,产流峰值减小,而蓄水层深度的增加则可导致穿孔管产流时刻提前、产流峰值增大;在4种降雨作用下,5类滞留带径流量平均消减率为16.71%~37.31%,径流峰值平均消减率为41.53%~63.90%,产流平均延迟时间为97.75~166.50 min;当滞留带发生溢流时,设施的径流调控能力显著降低,且结构层参数对设施径流调控效果的影响减弱。
[Abstract]:Based on the theory of unsaturated soil water movement, a numerical simulation method was used to study the effect of structural layer parameters of biological retention zone on water accumulation in facilities under four kinds of rainfall. The results showed that the surface hydrops in the biological retention zone were significantly affected by the depth of the aquifer, and increased from 20 cm to 30 cm with the depth of the aquifer. The overflow control water increased by 0.196 m ~ 3 on average, but the duration of water accumulation increased to 85 min. With the increase of the thickness ratio of planting soil to sand filter layer or the height of internal water storage area, the time of perforated pipe flow was delayed and the peak value of flow was decreased. However, the increase of the depth of the impoundment can lead to the advance of the flow time and the increase of the peak value of the perforated pipe. Under the action of four kinds of rainfall, the average reduction rate of runoff in the five types of detention zones is 16.71% and 37.31%, and the average reduction rate of runoff peak value is 41.53% and 63.90%. The average delay time of runoff was 97.75 ~ 166.50 min; When overflow occurred in the detention zone, the runoff control capacity of the facility decreased significantly, and the influence of the structural layer parameters on the runoff control effect of the facility was weakened.
【作者单位】：重庆交通大学土木工程学院;
【基金】：国家自然科学基金资助项目(51378520) 重庆市研究生科研创新项目(CYB16108)~~
【分类号】：TU992
【正文快照】： 随着城市化进程加快,不透水地面急剧增加,截断了雨水的原有入渗通道,使降雨入渗量大大减小,雨洪峰值增加,汇流时间缩短,导致城市雨洪危害加剧,水涝灾害频发[1-2]。为了营造绿色、健康、宜居的城市水环境,美国提出了低影响开发技术(Low Impact Development,LID),即利用天然景观

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