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降雨雨型对城市雨水系统内涝弹性的影响

The Influence of Rainfall Patterns on the Waterlogging Resilience of Urban Rainwater System

  • 摘要: 为探究降雨雨型对城市雨水系统内涝弹性的影响,基于MIKE FLOOD平台,以济南市新旧动能转换起步区大桥分区为研究对象,对7种重现期、3种降雨历时和3种雨峰系数的设计降雨雨型进行内涝过程场景推演,并结合层次分析法,以积水量、积水面积和平均积水深度为基础量化系统内涝弹性。结果表明:积水量峰值、积水面积峰值均随重现期、降雨历时的增大而增大,平均积水深度波动较大;系统性能前后主要发生两次波动,分别由降雨强度变化和研究区大部分洼地深度较浅导致;随着重现期的增加,系统内涝弹性越小,单位雨峰系数引起的系统内涝弹性极值对应的降雨量差异越来越大,整体上,降雨雨峰越居中和降雨历时越大,系统内涝弹性越小。

     

    Abstract: To explore the impact of rainfall patterns on the waterlogging resilience of urban rainwater systems based on the MIKE FLOOD platform, this paper conducts a study by using the bridge partition in the starting area of converting the new and old kinetic energy in Jinan.The waterlogging process scenarios are derived for 7 return periods, 3 rainfall durations, and 3 rainfall peak coefficients of the design rainfall. The system’s waterlogging resilience is quantified by using the Analytic Hierarchy Process(AHP) based on the amount, area, and average depth of waterlogging. The results show that the peak water accumulation and peak water accumulation area both increase with the increase in the return period and rainfall duration, and the average water accumulation depth fluctuates greatly. The system performance mainly fluctuates twice. The first fluctuation is caused by changes in rainfall intensity and the shallow depths cause the second in most of the depressions in the study area. As the return period increases, the system’s waterlogging resilience decreases, and the difference in rainfall corresponding to the extreme value of waterlogging resilience caused by the unit rainfall peak coefficient increases. Overall, the more centered the rainfall peak and the longer the rainfall duration, the lower the system’s waterlogging resilience.

     

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