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- W4236301168 abstract "Abstract. Landslides are an impacting natural hazard in alpine regions, calling for effective forecasting and warning systems. Here we compare two methods (physically-based and probabilistic) for the prediction of shallow rainfall-induced landslides in an application to Switzerland, with a specific focus on the value of antecedent soil wetness. First, we show that landslide susceptibility predicted by the factor of safety in the infinite slope model is strongly dependent on soil data inputs, limiting the hydrologically active range where landslides can occur to only ~20 % of the area with typical soil parameters and soil depth models. Second, the physically-based approach with a coarse resolution model setup (TerrSysMP) 12.5 km × 12.5 km downscaled to 25 m × 25 m with the TopographicWetness Index to provide water table simulations for the infinite slope stability model did not succeed in predicting local scale landsliding satisfactorily, despite spatial downscaling. We argue that this is due to inadequacies of the infinite slope model, soil parameter uncertainty, and the coarse resolution of the hydrological model. Third, soil saturation estimates provided by a higher resolution 500 m × 500 m conceptual hydrological model (PREVAH) provided added value to rainfall threshold curves for landslide prediction in the probabilistic approach, with potential to reduce false alarms and misses. We conclude that although combined physically-based hydrological-geotechnical modelling is the desired goal, we still need to overcome problems of model resolution, parameter constraints, and landslide validation for successful prediction at regional scales." @default.
- W4236301168 created "2022-05-12" @default.
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- W4236301168 date "2020-12-08" @default.
- W4236301168 modified "2023-10-03" @default.
- W4236301168 title "Rainfall-induced shallow landslides and soil wetness: comparison of physically-based and probabilistic predictions" @default.
- W4236301168 doi "https://doi.org/10.5194/hess-2020-624" @default.
- W4236301168 hasPublicationYear "2020" @default.
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