摘要
为了研究海绵校园LID措施的径流控制效果,以萍乡市北星小学的改造项目为例,利用萍乡市暴雨强度公式计算各个重现期的设计降雨,借助雨洪管理模型(SWMM),构建LID改造前后的降雨-径流模型,模拟不同设计降雨条件下校园内分别采用组合LID及单独布设LID措施的径流控制效果,以及透水路面堵塞情形下的径流控制效果。结果表明:校园海绵化改造后,年径流总量控制率达到75%,污染物削减率在60%左右,排放口流量峰值时刻延后7~10 min;三种LID措施对校园径流量削减的贡献度排序为:透水铺装>下沉式树池>下沉式绿地,对污染物削减的贡献度排序为:下沉式绿地>下沉式树池>透水铺装;透水路面堵塞对径流控制效果的影响在降雨重现期>30a时显著增大。通过对结果分析,设计方案下的海绵校园径流控制效果均达到预期目标,对一般的小范围海绵校园进行LID改造具有一定的参考价值。
In order to study the runoff control effect from LID(low impact development)measures in sponge campus,the project of improvement of Beixing Primary School in Pingxiang City is taken as the study case,and then the rainfall-runoff model before and after the LID improvement is built up with the design rainfalls of all the return periods calculated by the formula of rain storm intensity for Pingxiang City by means of the Storm Water Management Model(SWMM),thus the runoff control effects from the combined LID measures and the individually arranged LID measures adopted in the campus under various design rainfall conditions as well as the condition of the runoff control effect under the condition of the blockage of permeable pavement are simulated.The result shows that after the sponge improvement of the campus,the total annual runoff control rate is up to 75%,the pollutant reduction rate is about 60%and the peak discharge time of the discharge outlet is delayed by 7~10 minutes;for which the contributions of the three LID measures to the reduction of the campus runoff are ranked as follows:pervious pavement>sinking tree pond>sinking green space,while the influence from the permeable pavement blockage on the effect of runoff control is significantly increased when the rainfall return period>30 years.Through the result analysis,all the effects from the runoff control of the sponge campus under the design scheme reach to the expected goal and a certain reference value is there for the LID improvement of the sponge campus with general small-scale.
作者
徐多
XU Duo(China Railway Construction Bridge Engineering Bureau Group 3rd Engineering Co.,Ltd.,Tianjin 300300,China)
出处
《水利水电技术》
北大核心
2019年第7期32-39,共8页
Water Resources and Hydropower Engineering
基金
国家自然科学基金项目(51739011,51879274)
国家重点研发计划课题(2016YFC0401401)
中国铁建大桥工程局集团有限公司科技研究开发计划重大专项(DQJ-2017-B10)
关键词
海绵校园
低影响开发
雨洪管理模型(SWMM)
水文水质模拟
城市雨洪资源利用
城市水文学
海绵城市建设
sponge campus
low impact development(LID)
Storm Water Management Model(SWMM)
hydrology and water quality simulation
urban rain-flood resources utilization
urban hydrology
sponge city construction
