Sentinel-1 DInSAR for Monitoring Active Landslides in Critical Infrastructures: The Case of the Rules Reservoir (Southern Spain)
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AuthorReyes-Carmona, Cristina; Galve Arnedo, Jorge Pedro; Pérez Peña, José Vicente; Ruano Roca, Patricia; Azañón Hernández, José Miguel
DInSARSentinel-1Reservoir safetyLandslidesGeomorphological mapping
Reyes-Carmona, C., Barra, A., Galve, J. P., Monserrat, O., Pérez-Peña, J. V., Mateos, R. M., ... & Azañón, J. M. (2020). Sentinel-1 DInSAR for Monitoring Active Landslides in Critical Infrastructures: The Case of the Rules Reservoir (Southern Spain). Remote Sensing, 12(5), 809. [ doi:10.3390/rs12050809]
SponsorshipA Spanish “Sistema de Garantía Juvenil” research contract, founded by the Junta de Andalucía and the European Social Funds, supported the work of Cristina Reyes-Carmona. Spanish “Ramón y Cajal” grant supported part of the work of Jorge Pedro Galve. This work has been partially funded by the Spanish Ministry of Economy and Competitiveness through the DEMOS project “Deformation monitoring using Sentinel-1 data” (Ref: CGL2017-83704-P) and the LITHOSURF project “Respuesta de la topografía y la red de drenaje a procesos litosféricos y climáticos en el sur de Iberia” (Ref: CGL2015-67130-C2-1-R). This work has been partially developed in the framework of the RISKCOAST project (Ref: SOE3/P4/E0868) funded by the Interreg SUDOE program (3rd call for proposals).
Landslides in reservoir contexts are a well-recognised hazard that may lead to dangerous situations regarding infrastructures and people’s safety. Satellite-based radar interferometry is proving to be a reliable method to monitor the activity of landslides in such contexts. Here, we present a DInSAR (Differential Interferometric Synthetic Aperture Radar) analysis of Sentinel-1 images that exemplifies the usefulness of the technique to recognize and monitor landslides in the Rules Reservoir (Southern Spain). The integration of DInSAR results with a comprehensive geomorphological study allowed us to understand the typology, evolution and triggering factors of three active landslides: Lorenzo-1, Rules Viaduct and El Arrecife. We could distinguish between rotational and translational landslides and, thus, we evaluated the potential hazards related to these typologies, i.e., retrogression (Lorenzo-1 and Rules Viaduct landslides) or catastrophic slope failure (El Arrecife Landslide), respectively. We also observed how changes in the water level of the reservoir influence the landslide’s behaviour. Additionally, we were able to monitor the stability of the Rules Dam as well as detect the deformation of a highway viaduct that crosses a branch of the reservoir. Overall, we consider that other techniques must be applied to continue monitoring the movements, especially in the El Arrecife Landslide, in order to avoid future structural damages and fatalities.