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Distribution and Stabilization Mechanisms of Stable Landslide Dams

Author

Listed:
  • Liang Song

    (College of Environmental and Civil Engineering, Chengdu University of Technology, Chengdu 610059, China)

  • Yunsheng Wang

    (College of Environmental and Civil Engineering, Chengdu University of Technology, Chengdu 610059, China)

  • Yuchao Zhao

    (College of Environmental and Civil Engineering, Chengdu University of Technology, Chengdu 610059, China)

  • Zhuolin Xiao

    (College of Environmental and Civil Engineering, Chengdu University of Technology, Chengdu 610059, China)

  • Zhuo Feng

    (College of Environmental and Civil Engineering, Chengdu University of Technology, Chengdu 610059, China)

  • Shicheng Liu

    (College of Environmental and Civil Engineering, Chengdu University of Technology, Chengdu 610059, China)

  • Tao Tang

    (College of Environmental and Civil Engineering, Chengdu University of Technology, Chengdu 610059, China)

Abstract

Landslide dams, especially stable landslide dams, have been recognised as important contributors to regional geomorphological evolution. The eastern edge of the Tibetan Plateau provides good conditions for the formation of stable landslide dams. To identify stable landslide dams on the eastern margin of the Tibetan Plateau, the Google Earth Engine (GEE) was first used to map water surfaces in the study area. Then, stable landslide dams were identified using high-precision remote sensing images provided by Google Earth. A field investigation and a sampling of typical stable landslide dams were also adopted to characterise the landslide dams. The results show that 101 stable landslide dams are present in the study area, covering an area of 27.75 × 10 4 km 2 . There are four types of stable landslide dams, as follows: (1) landslides, (2) rock avalanches, (3) moraines, and (4) debris flows. The morphological parameters of a dam, which include dam height, dam width, dam volume, and catchment area, can be fitted with different relationship curves, with respect to the number of landslide dams. The source areas of landslide dams are generally located in the upper-middle and upper sections of adjacent mountains. The stability of a landslide dam is mainly controlled by the structure of the dam and the relationship between the dam volume and catchment area. Structurally, large rocks with large particle sizes are difficult to activate using river water and the large gaps between the rocks provide sufficient channels for the flow of river water. In regard to the relationship between the dam volume and catchment area, a river with a small catchment area in the study area is commonly blocked by a large dam volume. This study provides a unique opportunity to study the spatial distribution and clarify the factors influencing the stability of stable landslide dams.

Suggested Citation

  • Liang Song & Yunsheng Wang & Yuchao Zhao & Zhuolin Xiao & Zhuo Feng & Shicheng Liu & Tao Tang, 2024. "Distribution and Stabilization Mechanisms of Stable Landslide Dams," Sustainability, MDPI, vol. 16(9), pages 1-22, April.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:9:p:3646-:d:1383736
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    References listed on IDEAS

    as
    1. Bo Zhao & Yunsheng Wang & Junfeng Wu & Lijun Su & Jiangwei Liu & Gang Jin, 2021. "The Mogangling giant landslide triggered by the 1786 Moxi M 7.75 earthquake, China," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 106(1), pages 459-485, March.
    2. Yulong Cui & Jianhui Deng & Chong Xu, 2018. "Volume estimation and stage division of the Mahu landslide in Sichuan Province, China," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 93(2), pages 941-955, September.
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