Assessment and Causes of Debris Flow Susceptibility in the Nvjiang Grand Canyon Based on Maxent Model

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    In order to study the division of debris flow vulnerability and the sensitivity evaluation of environmental factors, 9 environmental factors, including precipitation, elevation, slope, aspect, runoff, lithology, fault, normalized differential vegetation index and soil erosion modulus, were selected to evaluate the vulnerability of 187 debris flow gullies based on the maximum entropy (Maxent) model. The results showed that the main factors leading to debris flow were runoff, elevation, precipitation, lithology, fault, slope, normalized differential vegetation index, soil erosion modulus and slope aspect. Based on the probability of debris flow hazards, the vulnerability zoning was carried out. It was found that the Gongshan Derung and Nu Autonomous County-Fugong section had the highest vulnerability, with an AUC of 0.974 and a standard deviation of 0.010. The results of the model analysis were consistent with the actual results. Compared with mountain torrents, the sensitivity of debris flow to environmental factors is more complex than that of mountain torrents. The reason of the complex sensitivity of environmental factors of debris flow is proved by the method of energy analysis. Runoff energy is shown to have the highest contribution to the formation of disasters in the Salween River Grand Canyon Debris.

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  • Received:June 05,2023
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  • Online: December 27,2023
  • Published: December 28,2023