Urban flood inundation and damage assessment based on numerical simulations of design rainstorms with different characte
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ban flood inundation and damage assessment based on numerical simulations of design rainstorms with different characteristics 1
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MEI Chao , LIU JiaHong , WANG Hao , LI ZeJin , YANG ZhiYong , SHAO WeiWei , 1 1 1 1 DING XiangYi , WENG BaiSha , YU YingDong & YAN DianYi 1
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State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water
Resources and Hydropower Research, Beijing 100038, China; Engineering and Technology Research Center for Water Resources and Hydroecology of the Ministry of Water Resources, Beijing 100044, China Received September 15, 2019; accepted January 7, 2020; published online April 24, 2020
In the context of global climate change and urbanization, urban flooding is an important type of natural disaster that affects urban development, especially in China, which is experiencing rapid urbanization. In the past 10 years, urban flooding events have caused huge disaster losses in Chinese cities. This has resulted in significant negative effects on the urban infrastructure, socioeconomic systems, and urban residents, thus causing widespread concern. Studies have confirmed the change in extreme rainstorms is due to the changing environments in many cities globally. Conducting studies on the impact of these rainstorms with different characteristics for urban flooding is valuable for coping with unfavorable situations. In addition, numerical simulations provide an economical and viable means to perform these studies. This paper presents a numerical model of Xiamen Island in China. Simulations were conducted for 12 design rainstorm events with different return periods, rain patterns, and durations. The results indicate that, in the case of an equal rainfall amount, the rainfall intensity is the key factor that affects the inundated area, depth, and damages. However, the rainfall intensity is not the only determining factor; the rainfall pattern also affects the inundations. In regard to the rainfall pattern, a higher rainfall peak coefficient usually leads to severe urban inundation and damage. As a result, the lag time would be shorter, which may further exacerbate the impact of urban flood disasters. The results of this study provide insights into managing flood risks, developing urban flood prevention strategies, and designing flood prevention measures. urban flood, flood damage assessment, flood disaster management, numerical simulations, design rainstorms Citation:
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Mei C, Liu J H, Wang H, et al. Urban flood inundation and damage assessment based on numerical simulations of design rainstorms with different characteristics. Sci China Tech Sci, 2020, 63, https://doi.org/10.1007/s11431-019-1523-2
Introduction
Urban flooding is a global issue that is gaining widespread attention in the context of climate change and urbanization [1,2]. As a country with a high speed of development, China has experienced rapid urbanization in recent years and has
*Corresponding author (email: [email protected])
faced many severe urban flooding disasters [3–
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