固原市玫瑰苑小区低影响开发措施改造对降雨径流的调控效益

Regulation and Control Benefits of Rainfall-Runoff by Low Impact Development Measures in a Residential District of Guyuan City

[目的]计算住宅小区海绵改造后对降雨径流的调控效益,旨在为海绵城市建设提供技术参考.[方法]结合宁夏回族自治区固原市某住宅小区各低影响开发(low impact development,LID)设施的布设情况,计算不同设计降雨量下LID设施对降雨径流的截蓄量与各LID设施截蓄容积的利用率;再结合固原市2004-2014年的降雨资料,计算出该小区年均降雨径流总截蓄量与各LID措施对降雨径流的截蓄量.基于计算出的小区LID设施对降雨径流的截蓄数据,结合资源环境经济学原理,计算小区降雨径流年调控效益、单方降雨径流调控效益与各LID措施年均降雨径流调控效益.[结果]小区海绵改建后,年均降雨径流调蓄量增加11568 m3,产生的效益为111302元/a,单方降雨径流调控效益为9.62元/m3;各LID设施年均效益分别为:雨水花园45273元/a,下沉式绿地27103元/a,雨水桶6654元/a,雨水池32272元/a.[结论]住宅小区海绵改建能够有效控制小区降雨径流的外排量,提高小区年径流总量控制率,具有明显的经济、环境和社会效益.

[Objective]The regulation and control benefits of rainfall-runoff after sponge reconstruction in residential districts were calculated to provide a technical reference for sponge city construction.[Methods]The interception capacity of rainfall-runoff and the utilization rate of low impact development(LID)facilities was calculated under different rainfall intensities,based on LID facilities in a residential district of Guyuan City,Ningxia Hui Autonomous Region.The total annual rainfall-runoff interception capacity and the rainfall-runoff interception capacity of each LID were measured using the rainfall data of Guyuan City from 2004 to 2014.The annual rainfall-runoff control benefit of each LID was determined using the calculated rainfall-runoff interception and storage capacity data of LID facilities,the resource and environment economics,the annual regulation benefit,and the unilateral rainfall-runoff control benefit.[Results]After sponge reconstruction,the average annual rainfall-runoff storage increased by 11568 m 3,the benefit was 111302 yuan per year,and the benefit of unilateral rainfall-runoff control was 9.62 yuan/m 3.The average annual benefits for each LID facility were 45273 yuan per year for a rain water garden,27103 yuan per year for a sunken green space,6654 yuan per year for a rain water bucket,and 32272 yuan per year for a rain pool.[Conclusion]Sponge reconstruction in residential areas can effectively control the external displacement of rainfall-runoff and improve the total annual runoff control rate,which has economic,environmental,and social benefits.