HAN Ling,ZHANG Tingyu,ZHANG Heng.Landslide Susceptibility Mapping Based on IOE and SVM Model in Fugu Town[J].Research of Soil and Water Conservation,2019,26(03):367-372.
基于IOE和SVM模型的府谷镇滑坡易发性分区
- Title:
- Landslide Susceptibility Mapping Based on IOE and SVM Model in Fugu Town
- 分类号:
- P642.2;P208
- 摘要:
- 将陕西省府谷县府谷镇作为研究区，通过野外实地调查，圈定了47个滑坡点，制作了研究区滑坡编录图。以GIS软件和统计分析模型为基础，开展研究区滑坡易发性分区研究。首先通过GIS软件将滑坡点随机分成训练样本（70%）和测试样本（30%）两组。然后选择坡度、坡向、高程、距断层的距离、距道路的距离、距河流的距离、岩性、土地利用、NDVI、降雨量作为影响因子，提取因子图层。分别应用熵权模型（IOE）和支持向量机模型（SVM）计算滑坡易发性指数，利用自然间断点法将研究区划分为低易发区、中易发区、高易发区和极高易发区。最后利用ROC敏感度曲线下的面积（AUC）分别检验两种模型所得到的分区结果，结果表明，成功率曲线和预测度曲线的AUC值均在0.70～0.90，表明两种模型所得到的分区结果具有较高的精度，都可以为研究区的滑坡防治提供参考。在训练样本和测试样本中SVM模型的AUC值均最高，说明SVM模型比IOE模型适合在研究区开展滑坡预测研究。
- Abstract:
- Fugu Town, Fugu County, Shannxi Province, was taken as the reasearch area. Through field investigation, 47 landslides have been mapped in landslide inventory map. Based on GIS software and statistical analysis model, study of landslide susceptibility mapping was carried out. Then, slope aspect, slope angle, altitude, distance to fault, distance to road, distance to river, lithology, land use, NDVI and rainfall were selected as conditioning factors to extract the factor layer. The landslide susceptibility index was calculated using the index of entropy model (IOE) and the support vector machine model (SVM), respectively. The natural break method was used to divide the study area into low, moderate, high, and very high region. Finally, the area under the ROC sensitivity curve (AUC) was used to test the partition results obtained by these two models. The results show that the AUC values of success rate and prediction rate are between 0.70 and 0.90, indicating that the two landslide susceptibility maps have high accuracy and can provide reference for landslide control in study area. The AUC values of SVM model are the highest in the training and validating samples, which means that the SVM model is suitable for landslide prediction research in the study area than IOE model.
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备注/Memo
收稿日期:2018-06-20;改回日期:2018-07-12。
基金项目:国家重点研发计划项目“黄土丘陵沟壑区沟道及坡面治理工程的生态安全保障技术与示范”（2017YFC0504700）
作者简介:韩玲(1964-),女,辽宁省沈阳市人,教授,博士,主要从事遥感地质与摄影测量研究工作。E-mail:2016027003chd.edu.cn
通讯作者:张庭瑜(1990-),男,陕西省汉中市人,博士研究生,主要从事地学信息工程与土地工程研究。E-mail:ztyymy@live.com