ISSN 1003-8035 CN 11-2852/P

    非滑坡样本选择对滑坡易发性评价的影响研究以汶川县、理县和茂县为例

    Analyzing the influence of non-landslide sample selection on landslide susceptibility: Case studies from Wenchuan, Lixian and Maoxian Counties

    • 摘要: 本研究探索了机器学习在评估滑坡易发性中的应用,重点关注非滑坡样本的选择问题。以四川省汶川县、理县和茂县为研究区,选取坡度、坡向、高程、距水系距离、距断层距离、岩性和土地利用7个评价因子,从信息量模型(I)、证据权重模型(WOE)、确定性系数模型(CF)、频率比模型(FR)划分的较低和极低易发区以及缓冲区外(B)和全区(G)随机选取非滑坡样本,构建基于不同非滑坡样本选取方法的支持向量机模型(SVM)并展开易发性评价。结果显示:I-SVM、WOE-SVM、CF-SVM、FR-SVM的ROC曲线下AUC值分别为0.98040.97260.93680.8451,优于B-SVM的0.7869和G-SVM的0.7389,说明采用数学统计模型所选取的非滑坡样本准确性更高,信息量模型是选取非滑坡样本的最优方法,为非滑坡样本的选取提供新思路。

       

      Abstract: This research explores the integration of machine learning in assessing landslide susceptibility, scrutinizing the selection of non-landslide samples. Taking the Wenchuan county, Lixian county, and Maoxian county in Sichuan Province as the study areas, seven evaluation factors were considered, including slope, aspect, elevation, distance to the water system, distance to the fault, lithology, and land use. Non-landslide samples were randomly selected from the lower and extremely low susceptibility zones divided by the Information Value model (I), Weight of Evidence model(WOE), Coefficient of Determination model (CF), and Frequency Ratio model(FR), as well as form the buffer zones (B) and the entire region (G). These samples were then analyzed using a Support Vector Machine (SVM) model. The results showed that the AUC values for I-SVM, WOE-SVM, CF-SVM, and FR-SVM were 0.9804, 0.9726, 0.9368, and 0.8451, respectively, hich were superior to the AUC values of B-SVM (0.7869) and G-SVM (0.7389). This highlight the effectiveness of using mathematical-statistical models for the selection of non-landslide samples, with particular emphasis on the accuracy of the Information Value model. This study offers a novel approach to selecting non-landslide samples, significantly enhancing predictive accuracy in landslide susceptibility assessments.

       

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