ISSN 1003-8035 CN 11-2852/P
    余明威,郭永刚,苏立彬. 西藏林芝地区崩滑流灾害影响因子定量评价[J]. 中国地质灾害与防治学报,2024,35(6): 1-11. DOI: 10.16031/j.cnki.issn.1003-8035.202307037
    引用本文: 余明威,郭永刚,苏立彬. 西藏林芝地区崩滑流灾害影响因子定量评价[J]. 中国地质灾害与防治学报,2024,35(6): 1-11. DOI: 10.16031/j.cnki.issn.1003-8035.202307037
    YU Mingwei,GUO Yonggang,SU Libin. Quantitative evaluation of influencing factors for landslide, rockfall and debris flow hazards in the Nyingchi area of the Tibet Autonomous Region[J]. The Chinese Journal of Geological Hazard and Control,2024,35(6): 1-11. DOI: 10.16031/j.cnki.issn.1003-8035.202307037
    Citation: YU Mingwei,GUO Yonggang,SU Libin. Quantitative evaluation of influencing factors for landslide, rockfall and debris flow hazards in the Nyingchi area of the Tibet Autonomous Region[J]. The Chinese Journal of Geological Hazard and Control,2024,35(6): 1-11. DOI: 10.16031/j.cnki.issn.1003-8035.202307037

    西藏林芝地区崩滑流灾害影响因子定量评价

    Quantitative evaluation of influencing factors for landslide, rockfall and debris flow hazards in the Nyingchi area of the Tibet Autonomous Region

    • 摘要: 林芝地区地形复杂,断层活动强烈,水系分布广泛,气候条件多变,地质灾害频发,对整个林芝地区经济发展和工程建设的影响日趋显著。其中,滑坡、崩塌、泥石流是林芝地区最常见的几种地质灾害,为了定量分析林芝地区内灾害对影响因子敏感性,本文基于GIS与确定性系数分析法,选取了高程、坡向、地形起伏度、地形湿度指数等10个因子开展对崩滑流灾害敏感性分析。分析结果表明:(1)林芝地区崩滑流灾害影响因子敏感性区间为:坡向为东向、东北向、南向、西向,地形起伏度在0~27 m/km2,高程在0.82~4.20 km,距水系距离0~3 km,距道路距离0~0.3 km,距活动断裂带距离0~3 km,归一化植被指数0.47~0.81,多年平均气温4.02~17.22 °C,多年平均降雨量51.15~146.14 mm,灾害与影响因子之间表现出良好的相关性。(2)影响因子间敏感性大小:多年平均气温>距水系距离>高程>距道路距离>归一化植被指数>多年平均降雨量>地形湿度指数>距活动断裂带距离>地形起伏度>坡向。研究结果对林芝地区工程建设与防灾减灾工作提供参考。

       

      Abstract: The Nyingchi area exhibits complex topography, high fault activity, an extensive water systems distribution, variable climatic conditions, and frequent geological hazards. These factors have a significantly growing impact on the economic development and engineering construction in the entire Nyingchi area. Among these hazards, landslides, collapses, and debris flows are the most common geological hazards in Nyingchi area. In order to quantitatively analyze the sensitivity of hazards in the Nyingchi area to the impact factors, this study, based on GIS and the certainty coefficient analysis method, selected ten factors, including elevation, slope aspect, topographic relief, and topographic humidity index, to conduct sensitivity analysis on landslide, rockfall and debris flow hazards. The analysis results show that: (1) The sensitive range of factors influencing landslide, rockfall and debris flow hazards in the Nyingchi area include slope aspects facing eastward, northeastward, southward, and westward; topographic relief ranging from 0 to 27 m/km2; elevation between 0.82 and 4.20 km; distances from the water system within 0 to 3 km, distances from the road wihtin 0 to 0.3km; distances from the active fault zone within 0 to 3 km; normalized vegetation index ranging from 0.47 to 0.81; annual average temperatures between 4.02 and 17.22 °C; annual average rainfall ranging from 51.15 to 146.14 mm. There exists a strong correlation between hazards and these impact factors. (2) Sensitivity among influencing factors follows this order: annual average temperature>distance from water system>elevation>distance from road>normalized vegetation index>average annual rainfall>topographic humidity index> distance from the active fault >topographic relief >aspect. The research results provide references for engineering construction and hazards prevention and mitigation work in the Nyingchi area.

       

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