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    王高峰, 李刚, 孙向东, 李浩, 田运涛, 董翰川, 高幼龙, 徐友宁, 王洪德, 李瑞冬. 甘肃南部山区城镇地质灾害风险双控模式初探[J]. 中国地质. DOI: 10.12019/gc20230220001
    引用本文: 王高峰, 李刚, 孙向东, 李浩, 田运涛, 董翰川, 高幼龙, 徐友宁, 王洪德, 李瑞冬. 甘肃南部山区城镇地质灾害风险双控模式初探[J]. 中国地质. DOI: 10.12019/gc20230220001
    WANG Gaofeng, LI Gang, SUN Xiangdong, LI Hao, TIAN Yuntao, DONG Hanchuan, GAO Youlong, XU Youning, WANG Hongde, LI Ruidong. Preliminary study on the“point-surface dual control” model of geological hazard risk in typical mountainous towns in Gansu Province[J]. GEOLOGY IN CHINA. DOI: 10.12019/gc20230220001
    Citation: WANG Gaofeng, LI Gang, SUN Xiangdong, LI Hao, TIAN Yuntao, DONG Hanchuan, GAO Youlong, XU Youning, WANG Hongde, LI Ruidong. Preliminary study on the“point-surface dual control” model of geological hazard risk in typical mountainous towns in Gansu Province[J]. GEOLOGY IN CHINA. DOI: 10.12019/gc20230220001

    甘肃南部山区城镇地质灾害风险双控模式初探

    Preliminary study on the“point-surface dual control” model of geological hazard risk in typical mountainous towns in Gansu Province

    • 摘要:研究目的】甘肃省是我国地质灾害高发地区之一,科学构建地质灾害风险“点面双控”模式是防灾减灾的关键。【研究方法】以陇南礼县龙林镇为例,在现场精细化勘查测绘、多期遥感数据建模、室内试验测试及数值模拟分析的基础上,阐述了以地质灾害风险识别、成灾模式研究、危险性分析、易损性评价、风险评价和风险防控对策建议等6大步骤的典型城镇地质灾害风险管控技术流程,介绍了城镇风险斜坡半定量风险评价过程,形成了基于动力过程的单体地质灾害定量风险评价方法和地质灾害风险双控模式。【研究结果】(1)研究区地质灾害类型主要为滑坡、泥石流2种,共发育地质灾害隐患点71处,其中有15处直接威胁人民生命财产安全,总结了3类滑坡成灾模式并建立了地质早期识别标志;(2)基于不同降水频率(5%、2%、1%)地质灾害风险区划表明,在不同降水频率下75.23%的区域始终保持低风险,24.38%的区域风险等级随降水频率的降低而增大,0.39%的区域始终保持极高风险;(3)基于风险评价结果,提出了可用于城镇和具体灾害点减灾的风险综合双控建议。【结论】相关研究可为复杂山区城镇防灾减灾、国土空间规划管控与用途管制提供技术支撑。

       

      Abstract: This paper is the result of mineral exploration engineering. Objective Gansu Province is one of the areas with high incidence of geological disasters in China. The scientific construction of a "point-surface dual control" model of geological disaster risks is the key to disaster prevention and mitigation.Method Taking Longlin Town as an example, on the basis of on-site refined survey and mapping, multi-phase remote sensing data modelling, indoor test and numerical simulation analysis, the paper expounds the typical urban geological disaster risk management and control technical process with six steps, including geological disaster risk identification, disaster mode research, risk analysis, vulnerability assessment, risk assessment and risk prevention and control countermeasures, and introduces the semi-quantitative risk assessment process of urban risk slope, the quantitative risk assessment method of single geological hazard based on dynamic process and the "point-surface dual control" mode of geological hazard risk have been formed. Results (1) The main types of geological hazards in the study area are landslide and debris flow, with a total of 71 hidden danger points of geological hazards developed, 15 of which directly threaten the safety of people's lives and property. The three types of landslide hazard models are summarized and the geological early identification signs are established; (2) Based on the geological hazard risk zoning of different precipitation frequencies (5%, 2%, 1%), 75.23% of the regions always maintain low risk under different precipitation frequencies, 24.38% of the regional risk level increases with the reduction of precipitation frequency, and 0.39% of the regions always maintain high risk; (3) Based on the results of risk assessment, a comprehensive risk dual control proposal for disaster reduction in towns and specific disaster sites is proposed. Conclusions Relevant research can provide technical support for disaster prevention and mitigation, land space planning and control and use control of complex mountain towns.

       

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