Abstract
The SHALSTAB model is commonly used in Brazil as a preventive measure for the occurrence of disasters caused by translational landslides. Therefore, an important issue is how to parameterize the soil property parameters to select value representative of the entire study area. In addition, the digital elevation model (DEM) resolution affects the predictive model performance. Thus, the objective of this study was to analyze the influence of soil parameter selection (friction angle, cohesion intercept, and saturated specific weight) considering the geotechnical homogeneous zones in order to map areas susceptible to landslides using the SHALSTAB model. The soil parameters were defined from laboratory measurements for each geotechnical homogeneous zone. We also compared model performance using same soil property values for entire basin with from weighted averages, least and most conservative soil parameters. Thus, the entire basin area can be considered as a geotechnical homogeneous zone. In addition, the influence of the DEM resolution on the landslide susceptibility evaluation was analyzed considering resolutions of 1 and 10 m. The study area was the Ribeirão Baú basin, located in the south of Brazil. In this area, 527 landslide scars were mapped, which allowed the results to be validated from validation curves. Based on the scenarios investigated, for both scales, it was verified that a variation in the soil parameters influences the model results. The model that presented the highest predictive capacity was that in which the weighted averages of the soil data were used for the entire basin with 1-m grid.
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Sbroglia, R.M., Reginatto, G.M.P., Higashi, R.A.R. et al. Mapping susceptible landslide areas using geotechnical homogeneous zones with different DEM resolutions in Ribeirão Baú basin, Ilhota/SC/Brazil. Landslides 15, 2093–2106 (2018). https://doi.org/10.1007/s10346-018-1052-7
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DOI: https://doi.org/10.1007/s10346-018-1052-7