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Selecting and weighting spatial predictors for empirical modeling of landslide susceptibility in the Darjeeling Himalayas (India)

机译：为大吉岭喜马拉雅山（印度）的滑坡敏感性实验模型选择和加权空间预测因子

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摘要

In this paper, we created predictive models for assessing the susceptibility to shallow translational rocksliding and debris sliding in the Darjeeling Himalayas (India) by empirically selecting and weighting spatial predictors of landslides. We demonstrate a two-stage methodology: (1) quantifying associations of individual spatial factors with landslides of different types using bivariate analysis to select predictors; and (2) pairwise comparisons of the quantified associations using an analytical hierarchy process to assign predictor weights. We integrate the weighted spatial predictors through multi-class index overlay to derive predictive models of landslide susceptibility. The resultant model for shallow translational landsliding based on selected and weighted predictors outperforms those based on all weighted predictors or selected and unweighted predictors. Therefore, spatial factors with negative associations with landslides and unweighted predictors are ineffective in predictive modeling of landslide susceptibility. We also applied logistic regression to model landslide susceptibility, but some of the selected predictors are less realistic than those from our methodology, and our methodology gives better prediction rates. Although previous predictive models of landslide susceptibility indicate that multivariate analyses are superior to bivariate analyses, we demonstrate the benefit of the proposed methodology including bivariate analyses.
机译：在本文中，我们通过经验选择和加权滑坡的空间预测因子，建立了预测模型，以评估大吉岭喜马拉雅山（印度）对浅平移岩石滑动和碎屑滑动的敏感性。我们展示了一个两阶段的方法：（1）使用双变量分析来选择预测因子来量化单个空间因素与不同类型滑坡的关联； （2）使用层次分析法分配预测变量权重的量化关联的成对比较。我们通过多类指数叠加法整合加权空间预测因子，以得出滑坡敏感性的预测模型。基于选择和加权的预测变量的浅平移滑坡模型模型的结果优于基于所有加权的预测因子或选择和未加权的预测因子的模型。因此，与滑坡呈负相关的空间因素和未加权的预测因子对滑坡敏感性的预测模型无效。我们还使用逻辑回归对滑坡敏感性进行了模型化，但是某些选定的预测因子不如我们的方法学那么现实，并且我们的方法学提供了更好的预测率。尽管以前的滑坡敏感性预测模型表明多变量分析优于双变量分析，但我们证明了所提出的包括双变量分析方法的优势。

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  • 来源
    《Geomorphology》 |2011年第2期|p.35-56|共22页
  • 作者

    Saibal Ghosh; Emmanuel John M. Carranza; Cees J. van Westen; Victor G. Jetten; Dipendra N. Bhattacharya;

  • 作者单位

    Engineering Geology Division, Geological Survey of India, Eastern Region, Kolkata, India Department of Earth System Analysis, Faculty of Geo-Information Science and Earth Observation (ITC), University of Twente, Enschede, The Netherlands;

    Department of Earth System Analysis, Faculty of Geo-Information Science and Earth Observation (ITC), University of Twente, Enschede, The Netherlands;

    Department of Earth System Analysis, Faculty of Geo-Information Science and Earth Observation (ITC), University of Twente, Enschede, The Netherlands;

    Department of Earth System Analysis, Faculty of Geo-Information Science and Earth Observation (ITC), University of Twente, Enschede, The Netherlands;

    Engineering Geology Division, Geological Survey of India, Eastern Region, Kolkata, India;

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  • 正文语种 eng
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  • 关键词

    spatial association; analytical hierarchy process; shallow translational landslides; darjeeling himalayas;

    机译：空间关联;分析层次过程;浅平移滑坡大吉岭喜马拉雅山;

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