蓄水层对绿色屋顶径流削减能力的影响分析  

Impact of Water Storage Layer on Runoff Reduction of Green Roofs

作　　者：秦华鹏[1] 唐女 唐巧玲[1] 

机构地区：[1]北京大学深圳研究生院环境与能源学院,城市人居环境科学与技术重点实验室,广东深圳518055

出　　处：《中国给水排水》2016年第13期132-135,共4页China Water & Wastewater

基　　金：广东省水利科技创新项目(2012-13);深圳市科技研发资金资助项目(ZDSYS20140509094114169);国家水体污染控制与治理科技重大专项(2013ZX07501005)

摘　　要：提出了耦合HYDRUS-1D与蓄水层蒸发模块的绿色屋顶模型,基于绿色屋顶试验和水文监测数据对模型进行了率定及验证,利用该模型分析了深圳市不同雨强、雨前干旱时间(ADP)和水文年下,蓄水层对绿色屋顶径流削减能力的影响。结果表明,随着次降雨强度的增加,绿色屋顶径流削减量先增加,在达到最大值后保持稳定,蓄水层厚度的增加可以显著提高绿色屋顶的最大径流削减量;随着ADP的增加,绿色屋顶对下次降雨径流的削减能力逐渐恢复,由于蓄水层蒸发对土壤层的补水作用,带蓄水层屋顶的径流削减能力恢复的速度远慢于无蓄水层屋顶;绿色屋顶对年径流削减量:枯水年<平水年<丰水年,且随蓄水层厚度的增加而增加。A HYDRUS-1D model for soil layer was coupled with an evaporation model for water storage layer to simulate the hydrological effects of green roofs with water storage layer. After calibration and validation, the model was applied to analyze the effects of the storage layer on the runoff reduction of green roofs under different rainfall intensities, antecedent dry periods （ADP） and hydrological years in Shenzhen, China. The results indicated that： ① as the rainfall intensity increased, the runoff reduction of green roofs initially increased, reached to the peak value and then kept stable; and the peak value of the runoff reduction significantly increased as the thickness of water storage layer increased ; ②as ADP increased, green roofs gradually recovered its capacity of runoff reduction; however, the recovery speed of runoff reduction capacity of the green roofs with water storage layer was far slower than that the green roofs without water storage layer due to the effect of evaporation from the water storage layer; ③ the annu- al runoff reduction of the green roofs under different hydrological years increased in the order of dry year 〈 normal year 〈 wet year; and the annual runoff reduction increased as the thickness of water storage layer increased.

关 键 词：绿色屋顶 蓄水层 HYDRUS模型 土壤含水率 径流削减 

分 类 号：TU985.12[建筑科学—城市规划与设计] TU992