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The effect of spatial–temporal characteristics of rainfall on urban inundation processes
Hydrological Processes ( IF 3.2 ) Pub Date : 2022-07-26 , DOI: 10.1002/hyp.14655
Guangzhao Chen 1 , Jingming Hou 1 , Tian Wang 1 , Jiahao Lv 1 , Jing Jing 1 , Xin Ma 1 , Shaoxiong Yang 2 , Chaoxian Deng 3 , Yue Ma 3 , Guoqiang Ji 3
Affiliation  

The spatial–temporal characteristics of rainfall is one of the important elements affecting urban inundation. In this work, the effect of spatial–temporal characteristics of rainfall on urban inundation processes was investigated. To solve the problem that it is difficult to acquire the spatial–temporal characteristics of rainfall, the weather generator model was used to generate rainfall data in accordance with the climatic conditions of the study area. Then, precise rainfall data with 1 km2 spatial resolution and 5 min temporal resolution were obtained through the downscaling method. Finally, the GAST hydrodynamic model was used to simulate the urban inundation processes under different rainfall scenarios. The simulated results show that the inundation area and the inundation water volume increase with the rainfall spatial–temporal heterogeneity, and the inundation peak time lags behind. The impact of rainfall spatial–temporal heterogeneity on inundation weakens as the rainfall return period prolongs. When the rainfall spatial heterogeneity increases, the high-risk inundation area enlarges, while the low-risk inundation area shrinks. The temporal distribution of rainfall exerts the greatest impact on the inundation peak time. The research results can help researchers understand the key effects of the spatial–temporal characteristics of rainfall on urban inundation, and obtain relatively reliable simulated inundation results even without detailed information of the spatial–temporal characteristics of rainfall.

中文翻译:

降雨时空特征对城市淹没过程的影响

降雨时空特征是影响城市洪水的重要因素之一。在这项工作中,研究了降雨时空特征对城市淹没过程的影响。为解决降雨时空特征难以获取的问题,根据研究区气候条件,利用天气发生器模型生成降雨数据。然后,精确的降雨数据与 1 km 2通过降尺度方法获得空间分辨率和5分钟时间分辨率。最后,利用GAST水动力模型模拟了不同降雨情景下的城市淹没过程。模拟结果表明,随着降雨时空异质性的增加,淹没面积和淹没水量增大,淹没高峰时间滞后。降雨时空异质性对洪水的影响随着降雨回归期的延长而减弱。当降雨空间异质性增加时,高风险淹没区扩大,低风险淹没区缩小。降雨的时间分布对淹没高峰时间的影响最大。
更新日期:2022-07-26
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