基于斜坡单元鄂西山区典型集镇地质灾害风险评价
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P642.22

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湖北省重点研发计划项目(2020BCB080); 湖北省地质局科技项目(KJ2022-14)


Risk Assessment of Geohazards Based on Slope Units in a Typical Mountainous County Town of Western Hubei Province
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    摘要:

    鄂西山区处于全省地质灾害高易发区,灾害频发,风险呈现加剧之势。本文以恩施州巴东县野三关集镇为研究区,通过开展地质灾害调查工作,归纳了孕灾地质条件,并构建了斜坡地质灾害风险评价体系:首先基于斜坡单元进行评价单元划分;然后采用层次分析法,选取斜坡坡度、斜坡高差、剖面曲率、工程地质岩组、地质构造、斜坡结构、水系密度、植被覆盖率等8个评价因子,对区内斜坡地质灾害易发性进行评价研究;综合考虑人类工程活动和降雨的诱发影响,进行不同降雨重现期工况下危险性区划;根据研究区人口、建筑、道路、土地等承灾体分布,分别进行人口易损性和经济易损性分区评价;最后根据危险性和易损性评价结果,进行地质灾害风险评价,为野三关集镇发展规划、地质灾害风险管控提供了地质依据。结果表明:随着降雨量的增加,高风险区和极高风险区的面积逐渐增加,主要集中分布在研究区东北片区,针对极高、高风险区地质灾害隐患点和有变形迹象的斜坡应采取工程治理或专业监测措施,制定应急预案。

    Abstract:

    The mountain region of Western Hubei Province is a highly-susceptible area of geohazard, where landslides and rockfalls happen frequently. The study area is Yesanguan county town in the western of Hubei Province. Based on the detailed investigation of geohazard, this paper summarizes the development and distribution characteristics and related geological conditions of geohazards in the study area, and establishes the risk assessment model of geohazards. As the evaluation area is divided into slope units,slope unit, slope, slope height, slope curvature, slope structure, engineering geological units, geological structure, gully density, and vegetation coverage are selected as the evaluation indexes to construct geohazard susceptibility assessment model in the AHP. Combined with the maximum daily rainfall in different return period and human engineering activities, the assessment model of geohazard probability is proposed. According to the distribution characteristics of different types of hazard-affected bodies, a vulnerability model is set up. Based on geohazard probability and vulnerability assessment, the risk assessment is constructed, showing that the high risk areas lie mainly in the northeast of the study area and providing the scientific basis for urban construction planning and geohazard risk management in the study area.

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李彧磊,熊启华,龙婧,等. 基于斜坡单元鄂西山区典型集镇地质灾害风险评价[J]. 科学技术与工程, 2023, 23(6): 2326-2338.
Li Yulei, Xiong Qihua, Long Jing, et al. Risk Assessment of Geohazards Based on Slope Units in a Typical Mountainous County Town of Western Hubei Province[J]. Science Technology and Engineering,2023,23(6):2326-2338.

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  • 收稿日期:2022-07-09
  • 最后修改日期:2022-12-19
  • 录用日期:2022-11-09
  • 在线发布日期: 2023-03-22
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