Modeling and validation of flash flood inundation in drylands

被引：0
|
作者：
Gao D. [1 ,2 ]
Yin J. [1 ,2 ]
Wang D. [3 ]
Yang Y. [2 ]
Lu Y. [1 ,2 ]
Chen R. [4 ]
机构：
[1] School of Geographical Sciences, East China Normal University, Shanghai
[2] Key Laboratory of Geo-information Science, Ministry of Education, East China Normal University, Shanghai
[3] National Disaster Reduction Center of China, Ministry of Emergency Management of People's Republic of China, Beijing
[4] School of Design, Shanghai Jiao Tong University, Shanghai
来源：
Dili Xuebao/Acta Geographica Sinica | 2023年 / 78卷 / 09期
基金：
中国国家自然科学基金;
关键词：
arid areas; Datong county; flash flood; Flood MapHydroInundation2D; numerical modeling;
D O I：
10.11821/dlxb202309010
中图分类号：
学科分类号：
摘要：
In the context of climate change and human activities, flood disasters in arid mountainous areas become increasingly frequent, and the safety of people's lives and property has been seriously threatened. Rapid and accurate flash flood inundation modeling is an important and basic work to reduce casualties and disaster losses, and it is also a bottleneck problem that needs to be solved urgently in flash flood forecasting and warning. This paper aims to construct a numerical modeling method for flash flood in drylands. Based on a 2D high-resolution flood numerical model (FloodMap- HydroInundation2D), we hindcast the dynamic process of flash flooding and reveal the spatio- temporal characteristics of flash flood inundation for the "8.18" flash flood disaster that occurred in Datong county, Qinghai province. The results show that the model output agrees well with the observed inundation after the event, in terms of both spatial extent and temporal process. The extensive flooding mainly occurred between 00: 00 and 1:00 on August 18, 2022. Qingshan, Hejiazhuang and Longwo villages are most heavily affected. We further conduct model sensitivity analysis and find that the model is highly sensitive to both roughness and hydraulic conductivity in drylands, and the effect of hydraulic conductivity is found to be more pronounced. This study confirms the good performance of the model for the simulation of flash flooding in arid areas, unlocking the potential for flash flood assessment and management in arid areas. © 2023 Science Press. All rights reserved.
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页码：2271 / 2283
页数：12
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