A comparative study of landslide susceptibility mapping using weight of evidence, logistic regression and support vector machine and evaluated by SBAS-InSAR monitoring: Zhouqu to Wudu segment in Bailong River Basin, China

• Published in: Environmental earth sciences 2017-04, Vol.76 (8), p.1-19, Article 313
• Main Authors: Xie, Zhengtuan, Chen, Guan, Meng, Xingmin, Zhang, Yi, Qiao, Liang, Tan, Long
• Format: Article
• Language: English
• Subjects: Area; Biogeosciences; Biological settlement; Comparative analysis; Comparative studies; Deformation; Deformation mechanisms; Distance; Earth and Environmental Science; Earth Sciences; Elevation; Environmental factors; Environmental monitoring; Environmental Science and Engineering; Geochemistry; Geological hazards; Geology; Hazard mitigation; Hydrology/Water Resources; Interferometric synthetic aperture radar; Interferometry; Landslides; Lithology; Mathematical models; Mitigation; Original Article; Principal components analysis; Radar; Regression analysis; Regression models; River basins; Rivers; SAR (radar); Statistical analysis; Statistical models; Statistical tests; Support vector machines; Synthetic aperture radar; Synthetic aperture radar interferometry; Terrestrial Pollution; Urban areas; Weight
• ISSN: 1866-6280; 1866-6299
• DOI: 10.1007/s12665-017-6640-7

The determining of landslide-prone areas in mountainous terrain is essential for land planning and hazard mitigation. In this paper, a comparative study using three statistical models including weight of evidence model (WoE), logistic regression model (LR) and support vector machine method (SVM) was undertaken in the Zhouqu to Wudu segment in the Bailong River Basin, Southern Gansu, China. Six conditionally independent environmental factors, elevation, slope, aspect, distance from fault, lithology and settlement density, were selected as the explanatory variables that may contribute to landslide occurrence based on principal component analysis (PCA) and Chi-square test. The relation between landslide distributions and these variables was analyzed using the three models and the results then used to calculate the landslide susceptibility (LS). The performance of the models was then evaluated using both the highly accurate deformation signals produced by using the Small Baseline Subset Interferometric Synthetic Aperture Radar technique and Receiver Operating Characteristic (ROC) curve. Results show more deformation points in areas with high and very high LS levels, and also more stable points in areas with low and very low LS levels for the SVM model. In addition, the SVM has larger area under the ROC curve. It indicates that the SVM has better prediction accuracy and classified ability. For the interpretability, the WoE derives the class of factors that most contributed to landsliding in the study area, and the LR reveals that factors including elevation, settlement density and distance from fault played major roles in landslide occurrence and distribution, whereas the SVM cannot provide relative weights for the variables. The outperformed SVM could be employed to determine potential landslide zones in the study area. Outcome of this research would provide preliminary basis for general land planning such as choosing new urban areas and infrastructure construction in the future, as well as for landslide hazard mitigation in Bailong River Basin.