Abstract
Recent advancements have seen a pervasive application of machine learning methodologies in assessing the susceptibility of geological hazards. A pivotal element influencing the accuracy of model predictions resides in the prudent selection of model parameters within machine learning frameworks. The objective of this study is to develop a robust landslide susceptibility assessment model by refining the support vector machine (SVM) model through the employment of the Bayesian algorithm for hyperparameter optimization. The southern part of the Qinghai-Tibet Plateau, focusing on major highways, is selected as the study area. Nine influencing factors, namely the elevation, slope, aspect, profile curvature, lithology, topographic wetness index, normalized difference vegetation index, distance to faults, and distance to rivers, are selected as the conditioning variables instrumental in evaluating the likelihood of collapse occurrences. Secondly, data from field surveys involving 351 landslides and randomly generated non-landslide data are utilized in a balanced 1:1 ratio to construct the training and testing datasets. Next, the cross-validation loss rate of the SVM model is selected as the objective function, and the Bayesian algorithm is used to optimize the BoxConstraint and KernelScale parameters of the SVM model, resulting in a Bayesian optimization-based SVM model. The results show that, within a five-fold cross-validation framework, the model yields 99.15% and 96.32% accuracy for the training and testing datasets, respectively. Concurrently, the area under the receiver operating characteristic curve values are recorded at 99.76% and 98.67% for the respective datasets, highlighting a notable level of predictive proficiency. Furthermore, factor importance ranking reveals lithology and elevation as the most influential, with partial dependence plots identifying high susceptibility areas between elevations of 2916 and 3954 m under soft lithology conditions. A collapse susceptibility map encompassing the entire study area is encompassing, categorizing the study area into extremely high (7.79%), high (13.38%), moderate (29.99%), and low (48.84%) susceptibility zones.
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Acknowledgements
We extend our heartfelt gratitude to everyone who has contributed to this article for their invaluable guidance and support throughout this study.
Funding
This work was financed by the Second Tibetan Plateau Scientific Expedition and Research Program (STEP) (Grant No. 2019QZKK0904), the National Natural Science Foundation of China (Grant No. 42177146), and the Science and the Key Research and Development Plan of Yunnan Province (Grant No. 202103AA080013).
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Sun, K., Li, Z., Wang, S. et al. A support vector machine model of landslide susceptibility mapping based on hyperparameter optimization using the Bayesian algorithm: a case study of the highways in the southern Qinghai–Tibet Plateau. Nat Hazards (2024). https://doi.org/10.1007/s11069-024-06665-3
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DOI: https://doi.org/10.1007/s11069-024-06665-3