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2024 Vol. 44, No. 3
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XU Wei, TIE Yongbo, ZHENG Xuan, YIN Wanqing, FU Xiaolin, OU Wen, BAI Yongjian, Ireneusz Malik, Małgorzata Wistuba. 2024. Development characteristics and temporal-spatial distribution of geological hazards in Liangshan Prefecture. Sedimentary Geology and Tethyan Geology, 44(3): 478-492. doi: 10.19826/j.cnki.1009-3850.2023.11002
Citation: XU Wei, TIE Yongbo, ZHENG Xuan, YIN Wanqing, FU Xiaolin, OU Wen, BAI Yongjian, Ireneusz Malik, Małgorzata Wistuba. 2024. Development characteristics and temporal-spatial distribution of geological hazards in Liangshan Prefecture. Sedimentary Geology and Tethyan Geology, 44(3): 478-492. doi: 10.19826/j.cnki.1009-3850.2023.11002
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Development characteristics and temporal-spatial distribution of geological hazards in Liangshan Prefecture

  • 1.

    Chengdu Center, China Geological Survey (Geosciences Innovation Center of Southwest China), Chengdu 610218, China

  • 2.

    Technology Innovation Center for Risk Prevention and Mitigation of Geohazard, Ministry of Natural Resources, Chengdu 611734, China

  • 3.

    Observation and Research Station of Chengdu Geological Hazards, Ministry of Natural Resources, Chengdu 610000, China

  • 4.

    Geological Environment Monitoring Station, Liangshan Prefecture, Xichang 615000, China

  • 5.

    Sichuan Provincial Institute of Territorial Ecological Restoration and Geological Disaster Prevention, Chengdu 610081, China

  • 6.

    University of Silesia in Katowice, Institute of Earth Sciences, Sosnowiec 41-200, Poland

Received Date:  20 May 2023
Revised Date:  11 September 2023
Accepted Date:  05 October 2023
Publish Date:  30 September 2024
    Abstract

  • Liangshan Prefecture is located in the northeastern margin of the Hengduan Mountain system and in the southern section of the Sichuan-Yunnan tectonic belt. Due to active structure, landforms, river cutting, etc., there are 4016 occurrences of geological disasters in Liangshan Prefecture, mainly small and medium-sized soil landslides, and small and medium-sized gully debris flows. Liangshan Prefecture is a high-risk area of geological disaster in Sichuan Province. This paper uses data collection, mathematical statistics, ArcGIS software analysis, and other methods to analyze and find that, according to the analysis of administrative region, Dechang County has the highest number of geological disaster developments, with a total of 387 occurrences. Ningnan County has the highest density of disasters development, with 17.7 sites per 100 km2. According to the analysis of river basins, the number of geological disasters in the Anning River Basin is the largest, reaching 779. The Meigu River Basin has the highest density of hazard development, with 11.18 places per 100 km2. In this paper, the spatial distribution of geological hazards of different disaster types is analyzed with disaster development density as the index. For landslides, 4 extremely high-density areas and 15 high-density areas are classified. The development of landslide is mainly controlled by active structures and slippery strata (such as red beds, Xigeda formation, etc.). For collapses, 2 extremely high-density areas and 5 high density areas are classified. The collapses are distributed along valleys and tributary channels in a zonal pattern, greatly influenced by slope cutting activities related to hydropower reservoir development and highway construction. For debris flows, 2 extremely high-density areas and 10 high-density areas are classified. The development of debris flows is greatly impacted by structural fractures, landforms and human engineering activities. The research results can provide data support and scientific references for disaster prevention and mitigation in Liangshan Prefecture.

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