1. Implementation of hydrometeorological thresholds for regional landslide warning in Catalonia (NE Spain)
- Author
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Universitat Politècnica de Catalunya. CRAHI - Centre de Recerca Aplicada en Hidrometeorologia, Universitat Politècnica de Catalunya. Geo2Aqua - Monitoring, modelling and geomatics for hydro-geomorphological processes, Palau Berastegui, Rosa Maria, Berenguer Ferrer, Marc, Hurlimann Ziegler, Marcel, Sempere Torres, Daniel, Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Universitat Politècnica de Catalunya. CRAHI - Centre de Recerca Aplicada en Hidrometeorologia, Universitat Politècnica de Catalunya. Geo2Aqua - Monitoring, modelling and geomatics for hydro-geomorphological processes, Palau Berastegui, Rosa Maria, Berenguer Ferrer, Marc, Hurlimann Ziegler, Marcel, and Sempere Torres, Daniel
- Abstract
Soil moisture plays a vital role in slope stability. As water infiltrates into the soil, shear strength decreases eventually leading to failure. However, most of the existing regional-scale landslide early warning systems (LEWS) rely solely on rainfall information and use rainfall thresholds to determine if the landslide triggering conditions are met. The original version of the Catalonia region LEWS combines real-time rainfall observations and susceptibility to compute warnings. The LEWS applies a set of rainfall intensity-duration thresholds to determine if the rainfall conditions have the potential to trigger a landslide. This work explores the potential of using modelled soil moisture data in the Catalonia region LEWS. Volumetric water content (VWC) from the LISFLOOD hydrological simulations of the European Flood Awareness System and rainfall estimates have been analysed at the location of recent landslide events. Based on this data, a set of empirical hydrometeorological thresholds combining rainfall and soil moisture information has been obtained for their application into the Catalonia region LEWS. The LEWS has been run for nine months (April–December 2020) using two approaches: (i) combining susceptibility and rainfall intensity-duration (I-D) thresholds and (ii) combining susceptibility and the new hydrometeorological thresholds including soil moisture information. Generally, both LEWS approaches issued moderate or high warnings in the areas where significant rainfall accumulations were recorded. The outputs have been compared at specific locations where landslides were reported during the analysed period. Results show that at the analysed locations false positives are generally reduced when employing the hydrometeorological thresholds in the LEWS. Therefore, this approach is promising and could help improve regional scale LEWS in Catalonia., Open access funding provided by Norwegian Geotechnical Institute. This work has been partly funded by the EC H2020 project ANYWHERE (DRS-01–2015-700099) and the Spanish research project EROSLOP (PID2019-104266RB-I00/AEI/10.13039/501100011033). The first author received support by a grant from the Secretariat of Universities and Research of the Ministry of Business and Knowledge of the Generalitat de Catalunya., Peer Reviewed, Postprint (published version)
- Published
- 2023