Hazard assessment of debris flow in Jinsha River

SUN Yuqing; GE Yonggang; CHEN Xingzhang; ZENG Lu; LIANG Xinyue; FENG Xin

doi:10.12097/gbc.2023.08.008

2025 Vol. 44, No. 2~3

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SUN Yuqing, GE Yonggang, CHEN Xingzhang, ZENG Lu, LIANG Xinyue, FENG Xin. 2025. Hazard assessment of debris flow in Jinsha River. Geological Bulletin of China, 44(2~3): 377-391. doi: 10.12097/gbc.2023.08.008

Citation:

SUN Yuqing, GE Yonggang, CHEN Xingzhang, ZENG Lu, LIANG Xinyue, FENG Xin. 2025. Hazard assessment of debris flow in Jinsha River. Geological Bulletin of China, 44(2~3): 377-391. doi: 10.12097/gbc.2023.08.008

Hazard assessment of debris flow in Jinsha River

1.
Key Laboratory of Mountain Hazards and Earth Surface Process, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences (CAS), Chengdu 610299, Sichuan, China
2.
University of Chinese Academy Sciences, Beijing 100049, China
3.
School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621000, Sichuan, China

More Information

Corresponding author: GE Yonggang, gyg@imde.ac.cn

Received Date: 04 August 2023

Revised Date: 25 September 2023

Publish Date: 15 March 2025

Abstract

Abstract

Objective
This study investigates the distribution characteristics of debris flow in Jinsha River and conducts a hazard assessment to provide data support and a scientific basis for understanding regional variations in debris flow and disaster prevention in the Hengduan Mountain area.
Methods
Based on the field investigation and GIS spatial analysis, 2551 debris flows in the Jinsha River were identified. Hazard assessment was performed based on the activity characteristics of these debris flows. Using ROC analysis and spatial clustering, the debris flow hazard zoning in the Jinsha River was established.
Results
① Debris flows in the upper reaches of Jinsha River are not active, predominantly of low to medium frequency, while high−frequency debris flows are concentrated in the lower reaches, especially between Yarmou and Qiaojia. ② The primary factors influencing debris flow formation include slopes ranging from 15° to 35°, frequent seismic activity, and the presence of both soft and hard clastic rocks. ③ Medium− and high−hazard debris flows cover 47.48% of the area, nearly half of the studied region. ④ The high−hazard zone in the Dongchuan−Qiaojia section shows high concentration, closely correlating with active faults and abundant sediment supply, largely controlled by tectonic activity.
Conclusions
High−hazard debris flow zones are concentrated in the downstream of Jinsha River. The hazard zoning map provides a reference for risk mitigation in hydropower development and transportation infrastructure planning.
- debris flow /
- hazard /
- activity characteristics /
- Jinsha River

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References

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