Preliminary study on the “Point−surface Dual Control” mode for geological hazard risk in typical mountainous towns of Gansu Province

WANG Gaofeng; LI Gang; SUN Xiangdong; LI Hao; TIAN Yuntao; DONG Hanchuan; GAO Youlong; XU Youning; WANG Hongde; LI Ruidong

doi:10.12029/gc20230220001

2025 Vol. 52, No. 3

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WANG Gaofeng, LI Gang, SUN Xiangdong, LI Hao, TIAN Yuntao, DONG Hanchuan, GAO Youlong, XU Youning, WANG Hongde, LI Ruidong. 2025. Preliminary study on the “Point−surface Dual Control” mode for geological hazard risk in typical mountainous towns of Gansu Province[J]. Geology in China, 52(3): 1128-1148. doi: 10.12029/gc20230220001

Citation:

WANG Gaofeng, LI Gang, SUN Xiangdong, LI Hao, TIAN Yuntao, DONG Hanchuan, GAO Youlong, XU Youning, WANG Hongde, LI Ruidong. 2025. Preliminary study on the “Point−surface Dual Control” mode for geological hazard risk in typical mountainous towns of Gansu Province[J]. Geology in China, 52(3): 1128-1148. doi: 10.12029/gc20230220001

Preliminary study on the “Point−surface Dual Control” mode for geological hazard risk in typical mountainous towns of Gansu Province

1.
Observation and Research Station of Geological Disaster in Lanzhou, Ministry of Natural Resources, Lanzhou 730030, Gansu, China
2.
Center for Hydrogeology and Environmental Geology of CGS, Tianjin 300309, China
3.
Observation and Research Station of Geological Disaster Monitoring and Early Warning in the Three Gorges Reservoir Area, Ministry of Natural Resources, Chongqing 404100, China
4.
Xi 'an Center of China Geological Survey, Xi’an 710061, Shaanxi, China
5.
Gansu Institute of Engineering Geology, Lanzhou 730030, Gansu, China

Fund Project: Supported by the project of China Geological Survey (No.DD20221747), the National Key Research and Development Program (No.2022YFC3003403).

More Information

Author Bio: WANG Gaofeng, male, born in 1984, senior engineer, mainly engaged in geological disaster investigation and evaluation; E-mail: wgf_cgcs303@163.com
Corresponding author: TIAN Yuntao, male, born in 1983, senior engineer, mainly engaged in the research of engineering geology and geothermal geology; E-mail: 394124773@qq.com.

Received Date: 20 February 2023

Revised Date: 06 May 2023

Publish Date: 25 May 2025

Abstract

Abstract

This paper is the result of geological hazard survey engineering.
Objective
Gansu Province is among the regions in China with a high incidence of geological hazards. The scientific establishment of the "point−surface dual control" mode for geological hazard risks is crucial for hazard prevention and mitigation.
Method
Taking Longlin Town as an example, this paper presents the technical process for managing and controlling geological hazard risks in typical urban areas based ondetailed on−site refined survey and mapping, multi−phase remote sensing data modelling, laboratory test, and numerical simulation analysis. The process includes six steps: geological hazard risk identification, disaster mode research, risk analysis, vulnerability assessment, risk assessment, risk prevention and control countermeasures. Additionally, it introduces the semi−quantitative risk assessment process of urban risk slope. A quantitative risk assessment method for single geological hazard based on dynamic process, as well as the "point−surface dual control" mode for geological hazard risk have also been established.
Results
(1) The primarygeological hazards identified in the study area are landslide and debris flows, with a total of 71 hidden hazard points, 15 of which pose direct threats topublic safety and property. Three landslide hazard modes are summarized, and geological early identification signs are established. (2) Risk zoning based ondifferent precipitation frequencies (5%, 2%, 1%) reveals that 75.23% of the regions consistently maintain low risk levels, 24.38% exhibit increased risk levelsas precipitation frequency decreases, and 0.39% remain in high risk levels. (3) Based on the risk assessment results, a comprehensive dual control strategy for hazard risk reduction in towns and specific disaster hazardsis proposed.
Conclusions
This research provides technical support for hazard prevention and mitigation, as well as for land use planning and management in complex mountain towns.
- geological hazards /
- risk assessment /
- point−surface dual control /
- mountainous towns /
- geological hazard survey engineering /
- Gansu Province

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References

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