Abstract
Shallow landslides (i.e., slide, flow, and complex) are widespread around the world, affecting the soil mantle and upper regolith as a result of the weathering of granitic bedrock, and periodically cause enormous social and economic damages. Shallow landslide hazards are predominantly due to the scarcity of warning signs during the pre-failure stage, high velocities reached in the post-failure phase, and an increase in mobilized volumes caused by the entrapment of material in the downhill path of the phenomena. Owing to the abovementioned aspects, susceptibility assessment of shallow landslides in weathered granitic rocks is a relevant issue for land use planning and design purposes. This study proposes a three-step methodology for the susceptibility assessment of these phenomena. The methodology has been tested and validated at the 1:10,000 scale over a 30.4-km2 area in southern Italy, where weathered granitic rocks are periodically affected by shallow landslides. This methodology is divided into three successive steps: step 1 consists of database creation, with an emphasis on the weathering grade map (including five weathering classes, from class II to class VI, each one characterized by comparable mechanical behavior), and steps 2 and 3 focus respectively on susceptibility map calibration and validation through statistical analyses. The area under the ROC curve (AUC) shows values ranging from 0.95 in step 2 (calibration) to 0.88 in step 3 (validation) and is a testament to the good overall predictive accuracy of the methodology. The obtained results demonstrate both the effectiveness and the consistency of the proposed methodology in performing susceptibility mapping of shallow landslides in weathered granitic rocks, as well as the important role played by the weathering grade map.
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17 February 2018
The published version of this article, unfortunately, contained error. Fig. 8 correction was not carried out. Given in this article is the correct figure.
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This work was conducted under the Project DTA.AD003.077.001 “Tipizzazione di eventi di dissesto idrogeologico” of the CNR Department of “Scienze del Sistema Terra e Tecnologie per l’Ambiente.”
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The original version of this article was revised: The published version of this article, unfortunately, contained error. Figure 8 correction was not carried out. Given in this article is the correct figure.
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Borrelli, L., Ciurleo, M. & Gullà, G. Shallow landslide susceptibility assessment in granitic rocks using GIS-based statistical methods: the contribution of the weathering grade map. Landslides 15, 1127–1142 (2018). https://doi.org/10.1007/s10346-018-0947-7
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DOI: https://doi.org/10.1007/s10346-018-0947-7