利用Info Works ICM模型建立深圳市光明新区新城公园雨水管网模型,分别以检查井和雨水口作为模型的节点划分汇水区,分析不同的汇水区划分方式对公园出口流量模拟结果的影响。结果表明:在中小降雨条件下,汇水区节点选取对峰值流量模拟结果的影响不明显;在暴雨或特大暴雨的条件下,汇水区节点选取对峰值流量模拟结果的影响较大;与以检查井为节点的划分方式相比,以雨水口为节点的划分方式产流时间会有一定程度的推迟;在模型建立过程中应综合考虑研究目标、区域尺度和降雨特征等对汇水区进行合理划分。 相似文献
Quantification of the uncertainty associated with stormwater models should be analyzed before using modelling results to make decisions on urban stormwater control and management programs. In this study, the InfoWorks Integrated Catchment Modelling (ICM) rainfall-runoff model was used to simulate hydrographs at the outfall of a catchment (drainage area 8.3 ha, with 95% pervious areas) in Shenzhen, China. The model was calibrated and validated for two rainfall events with Nash-Sutcliffe efficiency >0.81. The influence of rainfall, model parameters and routing methods on outflow hydrograph of the catchment was systematically studied. The influence of rainfall was analyzed using generated rainfall distributions with random errors and systematic errors (± 30% offsets). Random errors had less influence than systematic errors on peak flow and runoff volume, especially for two rainfall events with larger depths and longer durations. The Monte Carlo simulations using 500 parameter sets were used to verify the equifinality of the nine model parameters and determine the prediction uncertainty. Most of the monitored flows were within the uncertainty range. The influence of two routing methods from rainfall excess to hydrograph was studied. The InfoWorks ICM model incorporating double quasilinear reservoir routing was found to have a larger effect on the simulated hydrographs for rainfall events having larger depths and longer durations than using the U.S. EPA’s Storm Water Management Model nonlinear reservoir routing method did.