浅层滑坡诱发沟谷型泥石流快速识别方法研究

    Fast recognition method for debris flows caused by shallow landslides

    • 摘要: 浅层滑坡汇集形成的沟谷型泥石流具有突发性和破坏力强等特点,往往会造成巨大的人员伤亡和经济损失。减少泥石流造成损失的最有效途径是尽早发现、快速识别地质灾害潜在点。以福建省浅层滑坡诱发的沟谷泥石流为研究对象,选取沟床纵比降(J)、流域面积(A)和地形综合值(T)作为沟谷泥石流的识别因子,在已有的预警方法基础上,通过分析沟谷型泥石流的地形特征,提出了快速识别浅层滑坡诱发沟谷型泥石流的指标参数模型,并采用多个地区的易发性沟谷进行了精度评估。结果表明:该模型识别的结果和实际情况吻合度高,覆盖率达89%以上;当流域满足A≥0.03 km2,J≤0.42,且T≥0.28的条件时,滑坡物质易导致沟谷泥石流的发生。所提出经验模型所需的数据是易于测量的地形参数,可简单快速地识别潜在浅层滑坡诱发的沟谷型泥石流,为泥石流预警和防灾减灾工作提供参考。

       

      Abstract: The gully debris flow caused by shallow landslides is characterized by the strong suddenness and great destructiveness, which often causes casualties and economic losses.The most effective way to reduce the loss caused by debris flow is to find and identify the potential points of geological disasters as soon as possible.Taking the gully debris flow induced by shallow landslide in Fujian Province as the research object, the longitudinal slope of the gully bed(J),the drainage area(A) and the topographic comprehensive value(T) are selected as the identification factors of gully debris flow.Based on the existing early warning methods, by analyzing the topographic characteristics of gully debris flow, an index parameter model for rapid identification of gully debris flow induced by shallow landslide is proposed, and the accuracy is evaluated by debris flow-prone valley in many areas.The results show that the model identified results are consistent with the actual situation, the accuracy rate is more than 89%.When the watershed meets the conditions of A≥0.03 km2,J≤0.42,and T≥0.28,the landslide material can easily lead to the occurrence of gully debris flow.The data required by the proposed empirical model are easy-measured topographic parameters, and the model can easily and quickly identify the valley-type debris flow watershed induced by potential shallow landslides.The research can provide reference for debris flow warning and disaster prevention and mitigation.

       

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