ISSN 1009-6248CN 61-1149/P 双月刊

主管单位:中国地质调查局

主办单位:中国地质调查局西安地质调查中心
中国地质学会

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    基于分形维数耦合支持向量机和熵权模型的滑坡易发性研究

    Study of Landslide Susceptibility Mapping Based on Fractal Dimension Integrating Support Vector Machine with Index of Entropy Model

    • 摘要: 陕西省宝鸡市北部黄土高原滑坡灾害频发,严重威胁当地人民的经济发展和生产生活。本研究基于分形维数,分别利用熵权模型(IOE)、支持向量机模型(SVM)和两种混合模型即F-IOE和F-SVM对滑坡可能发生的范围进行定量预测。首先,利用179个滑坡样本制作滑坡编录图,将70%(125个)的滑坡样本用于训练,其余30%(54个)用于测试。随后,提取12种滑坡影响因子,分别计算每个因子的信息增益率和分形维数,并使用训练数据建立4种滑坡易发性分区模型。最后,利用受试者工作特征曲线(ROC)和统计学指标包括阳性预测率(PPR)、阴性预测率(NPR)和准确率(ACC)测试模型的性能,并比较模型的泛化性。结果表明,F-SVM模型在训练和测试数据集上分别得到最高的PPR、NPR、ACC和AUC值,其次是F-IOE模型。最终,F-SVM模型在所有模型中表现最优,因此,基于分形维数构建的混合模型比原始模型更具优势,可为当地滑坡防治决策提供参考。

       

      Abstract: Landslides occur frequently on the Loess Plateau in the north of Baoji City, Shaanxi Province, which seriously threaten the economic development, production and life of the local people. Based on fractal dimension, entropy weight model (IOE), support vector machine model (SVM) and two hybrid models, namely F-IOE and F-SVM, are used to quantitatively predict the possible occurrence range of landslide. First of all, 179 landslide samples were used to make landslide cataloguing maps, 70% (125) of the landslide samples were used for training, and the remaining 30% (54) were used for testing. Then, 12 kinds of landslide influence factors are extracted, information gain rate and fractal dimension of each factor are calculated respectively, and four landslide vulnerability zoning models are established using training data. Finally, the performance of the model was tested using the receiver operating characteristic curve (ROC) and statistical indicators including positive predictive rate (PPR), negative predictive rate (NPR) and accuracy rate (ACC), and the generalization of the model was compared. The results show that F-SVM model has the highest PPR, NPR, ACC and AUC values in training and test data sets respectively, followed by F-IOE model. Finally, F-SVM model is the best among all models. Therefore, the hybrid model based on fractal dimension has more advantages than the original model, which can provide reference for local landslide control decisions.

       

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