绿色屋顶与下凹式绿地串联对洪峰的削减效应分析_马姗姗_庄宝玉_张新波_彭森
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2020-01-27 21:34:17
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绿色屋顶与下凹式绿地串联对洪峰的削减效应分析马姗姗1,庄宝玉2,张新波3,4,彭森1(1.天津大学环境科学与工程学院,天津300072;2.天津市城市规划设计研究院,天津300201;3.天津市水质科学与技术重点实验室,天津300384;4.天津城建大学环境与市政工程学院,天津300384)摘要:为考察绿色屋顶与下凹式绿地这两种低影响开发(LID)措施的雨洪控制效果,对二者的产汇流模型进行了研究,并采用InfoWorksCS软件建立了天津某大学生活区的雨水系统排洪模型,模拟分析了不同降雨频率、两种排洪模式下二者对城市雨洪的影响。结果表明:当屋面与绿地各自排洪(屋顶径流不接入绿地)时,将不透水平屋面改为绿色屋顶、平式绿地改为下凹式绿地后,洪峰流量的降低幅度高达41.1%,径流系数降低至0.279,降低幅度高达49.9%,峰现时刻有效延迟,显著降低了城市化开发对水文效应的影响;当绿色屋顶与下凹式绿地串联(绿色屋顶径流接入下凹式绿地)时,与二者各自排洪相比,削峰和滞留效果更加显著,且随着降雨频率的增大,串联的优势越加明显。可见,绿色屋顶与下凹式绿地串联使用能更大限度发挥这两种LID措施的削峰效应,实现低影响开发的目标。关键词:低影响开发;绿色屋顶;下凹式绿地;InfoWorksCS中图分类号:TU992文献标识码:C文章编号:1000-4602(2014)03-0101-05基金项目:天津市科技创新专项资金(市长基金)资助项目(08FDZDSF03200);天津市水质科学与技术重点实验室开放研究基金资助项目AnalysisofPeakFlowReductionwithGreenRoofandSunkenLawnAppliedinSeriesMAShan-shan1,ZHUANGBao-yu2,ZHANGXin-bo3,4,PENGSen1(1.SchoolofEnvironmentalScienceandEngineering,TianjinUniversity,Tianjin300072,China;2.TianjinUrbanPlanningandDesignInstitute,Tianjin300201,China;3.TianjinKeyLaboratoryofWaterQualityScienceandTechnology,Tianjin300384,China;4.SchoolofEnvironmentalandMunicipalEngineering,TianjinChengjianUniversity,Tianjin300384,China)Abstract:Inordertoinvestigatetheeffectsofgreenroofandsunkenlawnwhicharebothlowim-pactdevelopment(LID)measuresonurbanfloodcontrol,therunoffvolumemodelsandrunoffroutingmodelsofthemwerestudied.TheInfoWorksCSwasemployedtobuildastormwatersystemmodelforthelivingareaofauniversityinTianjin.Basedonthemodel,thehydrologicaleffectsofgreenroofandsunk-enlawnwereanalyzedunderdifferentrainfallfrequenciesanddifferentflooddrainageways.Theresultsshowedwhentheroofandthelawndischargedstormwaterseparately(greenroofrunoffdidnotdischargeintosunkenlawn),afterthetransformationoftheimperviousflatrooftogreenroofandtransformationofflatlawntosunkenlawn,thepeakflowdecreasedbyupto41.1%,therunoffcoefficientreducedto·101·第30卷第3期2014年2月中国给水排水CHINAWATER&WASTEWATERVol.30No.3Feb.20140.279,decreasingby49.9%.Thepeaktimewasdelayedeffectively,whichsignificantlyreducedtheimpactofurbanizationonthehydrologicaleffects.Whengreenroofandsun
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