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当前位置: 首页 > 文章 > 北京地区不同设计暴雨强度下凹式绿地的减流效果 水土保持通报 2015,35 (2) 121-124
Position: Home > Articles > Runoff Reduction Effect of Sunken Lawn Under Different Designed Rainstorm Intensity in Beijing Area Bulletin of Soil and Water Conservation 2015,35 (2) 121-124

北京地区不同设计暴雨强度下凹式绿地的减流效果

作  者：
朱永杰;毕华兴;常译方;海璇
单  位：
北京林业大学水土保持学院
关键词：
下凹式绿地;暴雨强度;径流系数
摘  要：
[目的]研究不同汇水面积的周边外来雨水径流,计算绿地产流过程的动态径流系数以及对径流的削减率。[方法]采用人工模拟的下凹式绿地,模拟绿地的不同暴雨强度。[结果](1)30%下凹式绿地面积比基本可以拦蓄3年,5年一遇暴雨,稳定后径流系数在0.30以下;(2)下凹式绿地面积比为20%时,雨水口高8cm和5cm时对3年,5年一遇暴雨产生的径流削减率均在40%以上,稳定后的径流系数均在0.90以上,且两种雨水口高度下的削减率差异不明显,相比之下5cm雨水口高度设计较8cm更为合理;(3)绿地的产流速率变化过程曲线呈"几"字形,汇水面积越大、暴雨强度越大,产流速率稳定时的峰值就越大,产流历时也越长。[结论]下凹式绿地对暴雨条件下产生的径流有很好的削减作用,其所占面积比越大,削减效果越好。
译  名：
Runoff Reduction Effect of Sunken Lawn Under Different Designed Rainstorm Intensity in Beijing Area
作  者：
ZHU Yongjie;BI Huaxing;CHANG Yifang;HAI Xuan;College of Soil and Water Conservation,Beijing Forestry University;Key Laboratory of Soil and Water Conservation of State Forestry Administration,Beijing Forestry University;
关键词：
sunken lawn;;rainstorm intensity;;runoff coefficient
摘  要：
[Objective]This paper studied surrounding rainwater runoff of sunken lawn by calculating the dynamic runoff coefficient of runoff process and the runoff reduction rate.[Methods]The sunken lawn was artificial made to simulate their occupied area proportion,and the surrounding rainwater with different intensity was simulated.[Results](1)5cm height designed gullies can intercept 3-year,5-year recurred storm runoff basically when sunken lawn area ratio was 30%,and the runoff coefficients was 0.30 when it were stable;(2)When the sunken lawn area ratio was 20%,the lawn with 8cm and 5cm height gullies could reduce runoff rates of 3-year,5-year recurrence storm over 40%,and the stabilized runoff coefficient was0.90.The difference of reduction rate between the two designed gully-height lawns was not significant,and5 cm height gullies design was more economically reasonable than the one with 8cm gully;(3)The runoff rate from the lawn was a temporal unimodal curve.The peak flow rate was bigger and runoff duration was longer when the catchment area or the rainstorm intensity was greater.[Conclusion]Runoff reduction of sunken lawn was obvious,which was greater when the area ratio was higher.

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