A hybrid framework integrating physical model and convolutional neural network for regional landslide susceptibility mapping

Xin Wei, Lulu Zhang (), Junyao Luo and Dongsheng Liu
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Xin Wei: Shanghai Jiao Tong University
Lulu Zhang: Shanghai Jiao Tong University
Junyao Luo: Shanghai Jiao Tong University
Dongsheng Liu: Chongqing Bureau of Geology and Mineral Resources

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2021, vol. 109, issue 1, No 21, 497 pages

Abstract: Abstract Landslide susceptibility mapping (LSM) is critical for risk assessment and mitigation. Generalization ability and prediction uncertainty are the current challenges for LSM but have been rarely investigated. The generalization ability refers to the ability of trained models to assess the landslide susceptibility of new areas and make accurate predictions. The prediction uncertainty mainly comes from the possibility of wrongly selecting the unstable landslide samples as stable ones from incomplete landslide inventory. This paper proposes a hybrid model by integrating the convolutional neural network (CNN) with physical model transient rainfall infiltration and grid-based regional slope-stability analysis (TRIGRS) to address the challenges above by combining the advantages of the two approaches. CNN is the main structure of the hybrid model and serves as a binary classifier to capture the spatial and inter-channel correlation among landslide conditioning factors and landslide inventory. TRIGRS characterizes the differences among grids caused by lithology by converting originally spatially discrete and banded lithology information into spatially continuous safety factors (Fs) within a fixed range and pre-selects training samples to ensure the correctness of the selected non-landslide grids. Two towns (Zhuyuan and Qinglian) in Fengjie, Chongqing, China, are used as the study area. A landslide inventory and landslide conditioning factor maps with 30 m resolution consist of the database. The performance of CNN and the proposed hybrid model is compared using the receiver operating characteristic curve and relative landslide density index (R-index). The superiority of the hybrid model and the effect of pre-selection of training samples are investigated. The results reveal that the generalization ability is enhanced and the prediction uncertainty is reduced by the proposed hybrid model.

Keywords: Landslide susceptibility mapping; Convolutional neural network; TRIGRS; Hybrid model; Generalization ability (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1007/s11069-021-04844-0

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