A catastrophic natural disaster chain of typhoon-rainstorm-landslide-barrier lake-flooding in Zhejiang Province, China

CUI Yu-long; HU Jun-hong; XU Chong; ZHENG Jun; WEI Jiang-bo

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A catastrophic natural disaster chain of typhoon-rainstorm-landslide-barrier lake-flooding in Zhejiang Province, China

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On August 10,2019,due to the effect of a rainstorm caused by Super Typhoon Lekima,a landslide occurred in Shanzao Village,China.It blocked the Shanzao stream,forming a barrier lake,and then the barrier lake burst.This is a rare natural disaster chain of typhoon-rainstorm-landslide-barrier lake-flooding.This study was built on field surveys,satellite image interpretation,the digital elevation model(DEM),engineering geological analysis and empirical regression.The purpose was to reveal the characteristics and causes of the landslide,the features and formation process of the barrier lake and the dam break flooding discharge.The results show that the volume of the landslide deposit is approximately 2.4×105 m3.The burst mode of the landslide dam is overtopping,which took only 22 minutes from the formation of the landslide dam to its overtopping.The dam-break peak flow was 1353 m3/s,and the average velocity was 2.8–3.0 m/s.This study shows that the strongly weathered rock and soil slope has low strength and high permeability under the condition of heavy rainfall,which reminds us the high risk of landslides and the importance of accurate early warning of landslides under heavy rainfalls in densely populated areas of Southeast China,as well as the severity of the disaster chain of typhoon-rainstorm-landslide-barrier lake-flooding.

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《山地科学学报：英文版》 |2021年第8期|2108-2119|共12页
作者
CUI Yu-long; HU Jun-hong; XU Chong; ZHENG Jun; WEI Jiang-bo;
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作者单位

School of Civil Engineering and Architecture;

Anhui University of Science and Technology;

Huainan;

232001;

China;

National Institute of Natural Hazards;

Ministry of Emergency Management of China(former Institute of Crustal Dynamics;

China Earthquake Administration);

Beijing;

100085;

China;

Department of Civil Engineering;

Zhejiang University;

Hangzhou;

310058;

China;

College of Geology and Environment;

Xi’an University of Science and Technology;

Xi’an;

710054;

China;

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原文格式 PDF
正文语种 chi
中图分类自然灾害及其防治;
关键词
Natural disaster chain; Landslide; Barrier lake; Dam break flood; Typhoon Lekima;

A catastrophic natural disaster chain of typhoon-rainstorm-landslide-barrier lake-flooding in Zhejiang Province, China

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