基于室外LID渗透试验的绿地仿真建模及改造评估

Simulation Modeling and Reconstruction Evaluation of Green Land Based on Outdoor Low Impact Development Infiltration Test

采用大型室外低影响开发(LID)渗透试验床和人工降雨装置进行绿地地表构型的试验研究,测定不同降雨情景下绿地不同地表构型指标对应的雨水下渗量和径流外排量。试验得出符合广东地区降雨条件和土壤类型的最佳绿地地表构型,并依据试验结果,在暴雨洪水管理模型(SWMM)中构建对应的LID仿真模块,为绿地地表构型的优化和评估提供合理参数设置。改造案例研究发现,绿地地表构型的改良可以减少城市排水系统的溢流量。该项目结合室外试验与仿真建模的研究成果,以期为广东地区海绵城市低影响开发措施的大规模规划、布设和评估改造提供科学依据。

Surface configuration of green land was tested by using a large-scale outdoor low impact development(LID)infiltration bed and an artificial rainfall device.Infiltration and runoff volumes of different green land surface configuration indices under different rainfall scenarios were measured.The optimal surface configuration of green land was obtained by the experiment which met the rainfall conditions and soil types in Guangdong.According to the test results,the corresponding LID simulation module was constructed in storm water management model(SWMM)to provide reasonable parameter settings for optimization and evaluation of green land configuration.The case study showed that the improvement of green land surface configuration could reduce the overflow of urban drainage system.The project combined the research results of outdoor experiment and simulation modeling,and it could provide a scientific basis for large-scale planning,layout and evaluation of LID measures in sponge city construction in Guangdong.