Development of a methodology for predicting landslide hazards at a regional scale

Geoenvironmental Disasters - Tập 10 Số 1 - Trang 1-19 - 2023
Richer, Blanche1, Saeidi, Ali1, Boivin, Maxime1,2, Rouleau, Alain1, Lévesque, Yan1
1Department of Applied Sciences, Université du Québec à Chicoutimi, Chicoutimi, Canada
2Département des sciences humaines et sociales - Géographie, Université du Québec à Chicoutimi, Chicoutimi, Canada

Tóm tắt

Landslide risk analysis is a common geotechnical evaluation and it aims to protect life and infrastructure. In the case of sensitive clay zones, landslides can affect large areas and are difficult to predict. Here we propose a methodology to determine the landslide hazard across a large territory, and we apply our approach to the Saint-Jean-Vianney area, Quebec, Canada. The initial step consists of creating a 3D model of the surficial deposits of the target area. After creating a chart of the material electrical resistivity adapted for eastern Canada, we applied electric induction to interpret the regional soil. We transposed parameter values obtained from the laboratory to a larger scale, that is to a regional slope using the results of a back analysis undertaken earlier, on a smaller slide within the same area. The regional 3D model of deposits is then used to develop a zonation map of slopes that are at risk and their respective constraint areas with the study region. This approach allowed us to target specific areas where a more precise stability analysis would be required. Our methodology offers an effective tool for stability analysis in territories characterized by the presence of sensitive clays.

Tài liệu tham khảo

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