Characteristics and risk analysis of the flash flood occurring in Datong of Qinghai Province on August 18, 2022
HE Haixia1(), LI Bo2()
1. National Disaster Reduction Center of China, Ministry of Emergency Management of the People’s Republic of China, Beijing 100024, China 2. National Institute of Natural Hazards, Ministry of Emergency Management of the People’s Republic of China, Beijing 100085, China
In the early morning of August 18, 2022, a flash flood occurred in Datong Hui and Tu Autonomous County, Xining City, Qinghai Province, resulting in 26 deaths and 5 missing. This flash flood is a typical event of multiple casualties caused by a creek disaster. The superimposed effect of rainfall directly led to this flash flood. The early continuous rainfall caused soil moisture content to reach or approach saturation. On the night of August 17, 2022, local short-time heavy rainfall smashing historical records, which could not infiltrate into the soil or be retained by vegetation, resulted in a flash flood. As revealed by the comprehensive analysis of remote sensing data, digital elevation model, field data, and media data, the flash flood area exhibited a large catchment area, a narrow river valley, a high relative height difference, a shallow river channel, and many obstacles. Consequently, the flash flood manifested high potential energy, a long movement distance, and locally severe backwater overflow, destroying some houses, farmland, and roads on both sides of the river channel. Against the backdrop of global changes, low-risk areas of flash floods, including the arid region of northwest China and the Qinghai-Tibet Plateau, display significantly increased precipitation and frequent local short-time heavy rainfall. Hence, creeks in these low-risk areas are exposed to increasing risks of flash floods and even catastrophic ones. Additionally, heavy rainfall might induce the recurrence of flash floods in disaster areas.
和海霞, 李博. 青海大通“8·18”山洪灾害特征及风险分析[J]. 自然资源遥感, 2024, 36(2): 135-141.
HE Haixia, LI Bo. Characteristics and risk analysis of the flash flood occurring in Datong of Qinghai Province on August 18, 2022. Remote Sensing for Natural Resources, 2024, 36(2): 135-141.
Cui P, Zou Q. Theory and method of risk assessment and risk management of debris flows and flash floods[J]. Progress in Geography, 2016, 35(2):137-147.
doi: 10.18306/dlkxjz.2016.02.001
[2]
张志彤. 我国山洪灾害特点及其防治思路[J]. 中国水利, 2007(14):14-15.
Zhang Z T. Characters of mountain flood disasters in China and prevention methods[J]. China Water Resources, 2007(14):14-15.
Guo L, Ding L Q, Sun D Y, et al. Key techniques of flash flood disaster prevention in China[J]. Journal of Hydraulic Engineering, 2018, 49(9):1123-1136.
Liu Y S, Yang Z S, Huang Y H, et al. Spatiotemporal evolution and driving factors of China’s flash flood disasters since 1949[J]. Scientia Sinica(Terrae), 2019, 49(2):408-420.
Wang C H, Zhang S N, Zhang F M, et al. On the Increase of precipitation in the northwestern China under the global warming[J]. Advances in Earth Science, 2021, 36(9):980-989.
doi: 10.11867/j.issn.1001-8166.2021.087
Xin R F, Li Z R, Zhang K, et al. Remote sensing monitoring of the dynamic changes in geologic hazards in the Huangshui River basin of Qinghai Province[J]. Remote Sensing for Natural Resources, 2022, 34(4):254-261.doi:10.6046/zrzyyg.2021313.
Zhang Z J, Zhuang Y C. The survey of geological hazards based on GF-1 data: Taking example for Datong County,Qinghai Province[J]. Science Technology and Engineering, 2017, 17(18):9-17.
[11]
潘腾. 高分二号卫星的技术特点[J]. 中国航天, 2015(1):3-9.
PAN T. Technical characteristic of Gaofen-2 satellite[J]. Aerospace China, 2015(1):3-9.
Wei H Y, Xiao C C, Song Q J, et al. Natural resources typical applications in on-orbit test of ZY-1-02D satellite[J]. Spacecraft Engineering, 2020, 29(6):148-154.
Shen Q, Yao Y, Li L, et al. Annual 0.8 m surface reflectance data set of Beijing plain area from 2015 to 2019[J]. National Remote Sensing Bulletin, 2021, 25(11):2303-2312.
Xue Y B, Wang B, Ma H T. Datong County, Qinghai Province announces the causes of the "8.18" flash flood disaster.[EB/OL].(2022-08-19)[2023-05-18]. http://www.xinhuanet.com/2022-08/19/c_1128928016.htm.
Jia J. Flash flood causes,characteristics and prevention measures of loess area in eastern Qinghai[J]. Qinghai Science and Technology, 2011, 18(5):55- 57.
Fan Y D, He H X, L B, et al. Research on flood disaster extent dynamics monitoring using HJ-1CCD:A case study in Fuyuan of Heilongjiang Province,Northestern China[J]. Remote sensing technology and application, 2016, 31(1):102-108.
Shi Y F, Shen Y P, Li D L, et al. Discussion on the present climate change from warm-dry to warm-wet in northwest China[J]. Quaternary Sciences, 2003, 23(2):152-164.
He B S, Ma M H, LI Q, et al. Current situation and characteristics of flash flood prevention in China[J]. China Rural Water and Hydropower, 2021(5):133-138,144.
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