| Citation: |
ZANG Yeqi，GUO Yonggang，SU Libin，et al. Assessment of landslide susceptibility in southeast Xizang Region based on multiple models[J]. The Chinese Journal of Geological Hazard and Control，2024，35(6): 58-69. DOI: 10.16031/j.cnki.issn.1003-8035.202309021
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The geological environment in southeast Xizang is complicated and disasters occur frequently. Landslides pose a great threat to engineering construction and human and financial safety in the region. In order to select models with higher precision for regional landslide prediction in southeast Xizang, this paper used modified landslide point data through field investigation, combined with topographic and geomorphic factors, geological factors, land cover factors and induced factors, and screened the factors through principal component analysis. Frequency ratio models, BP neural network models, and a combination of the two models were used for regional landslides prediction in southeast Xizang. Finally, ROC curves were used to evaluate the model accuracy. The results showed that the frequency ratio model after factor selection had the highest prediction accuracy for southeast Xizang (AUC=0.889). Models with factors removed through principal component analysis had higher accuracy than those without removal, and landslides in southeast Xizang were mainly distributed along river systems, including the Yarlung Zangbo River, Daqu River, Zangqu River, Nujiang River, Lancang River, Weiqu River, Janqu River and Zhaqu River. The models were used to predict the disaster in the study area, revealing that landslide points were located in high susceptibility and susceptibility zones. The models developed in this study can provide technical reference for engineering construction in southeast Xizang.
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