Study on rainfall threshold of different lithologic landslides in Bailong River Basin of Gansu Province

Hailong CHEN; Xiaoling SONG; Yongjun ZHANG; Kaihuan LIU; Li ZHANG; Mingxia LIU; Guan CHEN

doi:10.16031/j.cnki.issn.1003-8035.202401019

Zhongguo dizhi zaihai yu fangzhi xuebao (Apr 2024)

Study on rainfall threshold of different lithologic landslides in Bailong River Basin of Gansu Province

Hailong CHEN,
Xiaoling SONG,
Yongjun ZHANG,
Kaihuan LIU,
Li ZHANG,
Mingxia LIU,
Guan CHEN

Affiliations

Hailong CHEN: Geological Environment Monitoring Institute of Gansu Province / Gansu Province Key Laboratory of Groundwater Engineering and Geothermal Resources, Lanzhou, Gansu　730050, China
Xiaoling SONG: Geological Environment Monitoring Institute of Gansu Province / Gansu Province Key Laboratory of Groundwater Engineering and Geothermal Resources, Lanzhou, Gansu　730050, China
Yongjun ZHANG: Geological Environment Monitoring Institute of Gansu Province / Gansu Province Key Laboratory of Groundwater Engineering and Geothermal Resources, Lanzhou, Gansu　730050, China
Kaihuan LIU: Geological Environment Monitoring Institute of Gansu Province / Gansu Province Key Laboratory of Groundwater Engineering and Geothermal Resources, Lanzhou, Gansu　730050, China
Li ZHANG: Geological Environment Monitoring Institute of Gansu Province / Gansu Province Key Laboratory of Groundwater Engineering and Geothermal Resources, Lanzhou, Gansu　730050, China
Mingxia LIU: Geological Environment Monitoring Institute of Gansu Province / Gansu Province Key Laboratory of Groundwater Engineering and Geothermal Resources, Lanzhou, Gansu　730050, China
Guan CHEN: College of Earth and Environmental Sciences, Lanzhou University/Gansu Environmental Geology and Geohazards Engineering Research Centre,Lanzhou, Gansu　730000, China

DOI: https://doi.org/10.16031/j.cnki.issn.1003-8035.202401019
Journal volume & issue: Vol. 35, no. 2
pp. 40 – 46

Abstract

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The research results regarding the threshold values for slope disasters caused by rainfall are crucial for geological disaster prevention. In this study，landslides induced by long-term heavy rainfall occurred in five counties within the Gansu section of the Bailongjiang Basin between 2004 and 2019. Using the frequency method, the rainfall thresholds for early warning of rainfall type landslides with different rock characteristics were investigated. A relationship model between event rainfall and the duration of rainfall leading to landslides was constructed under different probability levels, and a lower threshold for critical cumulative rainfall was provided. Through verification of landslide characteristics and rainfall data resulting from a flash flood disaster in Wudu District in 2020，the accumulated rainfall measured by the rainfall gauge before the landslide is found to be consistent with the threshold given by the model. This finding is of guiding significance for early warning of landslide disasters caused by sustained heavy rainfall.

Published in Zhongguo dizhi zaihai yu fangzhi xuebao

ISSN: 1003-8035 (Print)
Publisher: Editorial Office of The Chinese Journal of Geological Hazard and Control
Country of publisher: China
LCC subjects: Science: Geology
Website: https://www.zgdzzhyfzxb.com/

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