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Variation in Debris-Flow-Prone Areas with Ecosystem Stability: A Case Study of the Qipan Catchment in the Wenchuan Earthquake Region

Author

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  • Xiaoyu Zhan

    (Hubei Provincial Engineering Research Center of the Slope Habitat Construction Technique Using Cement-Based Materials, China Three Gorges University, Yichang 443002, China
    College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, China)

  • Xudong Hu

    (Hubei Provincial Engineering Research Center of the Slope Habitat Construction Technique Using Cement-Based Materials, China Three Gorges University, Yichang 443002, China
    College of Civil Engineering and Architecture, China Three Gorges University, Yichang 443002, China)

  • Zexin Jing

    (College of Civil Engineering and Architecture, China Three Gorges University, Yichang 443002, China)

  • Wennian Xu

    (Hubei Provincial Engineering Research Center of the Slope Habitat Construction Technique Using Cement-Based Materials, China Three Gorges University, Yichang 443002, China
    College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, China
    College of Civil Engineering and Architecture, China Three Gorges University, Yichang 443002, China)

  • Dong Xia

    (Hubei Provincial Engineering Research Center of the Slope Habitat Construction Technique Using Cement-Based Materials, China Three Gorges University, Yichang 443002, China)

  • Gujie Ding

    (Hubei Provincial Engineering Research Center of the Slope Habitat Construction Technique Using Cement-Based Materials, China Three Gorges University, Yichang 443002, China
    College of Civil Engineering and Architecture, China Three Gorges University, Yichang 443002, China)

Abstract

The spatial distribution of vegetation in a basin has a far-reaching influence on the potential for sediment separation and transport capacity. However, many landslides induced by strong earthquakes have greatly changed the existing pattern, which further increases the probability of debris flow in a basin during heavy rainfall and has a significant impact on the stability of the basin. Thus, this study selected the debris flow basin in the Qipan catchment of the Wenchuan earthquake area as the research object. Multisource and high-precision remote sensing images were used to analyze the land use changes in the basin, and the index of connectivity (IC) was introduced to analyze the evolution of sediment transport capacity. An ecosystem stability assessment method suitable for post-earthquake debris flow basins was proposed. Through quantitative assessment of the ecosystem stability of the basin after the Wenchuan earthquake in 2008 and the two debris flow events after the earthquake, the dynamic relationship between the debris-flow-prone area and the ecosystem stability of the basin was revealed. The results showed that the stability of the ecosystem in the Qipan catchment increased annually, indicating a stable and substable state. The spatial distribution characteristics were lower in the north and south and greater in the middle. By comparing the evaluation results with the actual terrain change trend, the accuracy and feasibility of the evaluation method are verified. The results of this study provide a scientific basis for the formulation of regional disaster prevention strategies and help to accelerate the improvement of regional stability in debris-flow-prone areas.

Suggested Citation

  • Xiaoyu Zhan & Xudong Hu & Zexin Jing & Wennian Xu & Dong Xia & Gujie Ding, 2024. "Variation in Debris-Flow-Prone Areas with Ecosystem Stability: A Case Study of the Qipan Catchment in the Wenchuan Earthquake Region," Sustainability, MDPI, vol. 16(9), pages 1-23, May.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:9:p:3855-:d:1388604
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    References listed on IDEAS

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    1. Mingtao Ding & Tao Huang, 2019. "Vulnerability assessment of population in mountain settlements exposed to debris flow: a case study on Qipan gully, Wenchuan County, 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. 99(1), pages 553-569, October.
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