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城市内涝积水对暴雨雨型响应规律研究
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摘要
为揭示不同雨型对城市内涝积水程度影响规律,本文应用基于水动力方法的城市雨洪过程数值模型对研究区域的暴雨致涝特性进行了模拟计算,依次模拟了不同重现期及不同峰值比例的设计暴雨条件下的内涝积水量,并根据计算结果分析了暴雨雨型对城市内涝的量化影响。研究发现:降雨重现期小于5年一遇时,峰现时问靠前的降雨场次内涝积水更为严重;重现期增大至50年一遇时,峰现时间靠后的降雨会导致更大涝灾,而降雨重现期为5年、10年、20年、50年时,内涝积水对于降雨峰值比例参数不敏感。此外,暴雨峰值比例越小或重现期长,内涝积水总量峰现时间对于降雨峰现时间的延后性越强,但当降雨为百年一遇特大暴雨时,内涝积水峰值基本消除了延后性。上述规律对城市规划和雨洪管理具有一定的指导意义。
In order to reveal the influence of different design hyetographs on urban flood inundation,this work apply a hydro-dynamic model for rainfall-runoff process to simulate urban flood inundation patterns effected by design hyetographs with different position coefficients of rainfall peak and a set of return periods.The modelled results show that urban rainstorm water logging of smaller position coefficients of rainfall peak is more serious with the return period under 5a,while it is the other way around with the return period greater than 50 a.For the return periods between 5a and 50 a,the inundation is not sensitive the position coefficients.In addition,the when the position coefficient is smaller or the return period is longer,the hysteresis of inundation to the storm peak becomes heavier.However,if the return period is longer than 100 a,the hysteresis nearly disappear.The finding in this paper could provide theoretical references to the urban planning and flood management.
引文
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