Deceleration captured by InSAR after local stabilization works in a slow‑moving landslide: the case of Arcos de la Frontera (SW Spain)
Metadatos
Mostrar el registro completo del ítemAutor
Bru, Guadalupe; Ezquerro, Pablo; Azañón, Jose M.; Mateos, Rosa M.; Tsige, Meaza; Bejar-Pizarro, Marta; Guardiola‑Albert, CarolinaEditorial
Springer
Materia
InSAR Geotechnical monitoring Urban landslide
Fecha
2024-06-28Referencia bibliográfica
Bru, G. et. al. Landslides (2024). [https://doi.org/10.1007/s10346-024-02292-y]
Patrocinador
project UNDERGY, subsidized by the Center for Industrial Technological Development (CDTI); framework of the Recovery, Transformation and Resilience Plan and the State Program for Business Leadership in R&D&I, of the State Plan for Scientific and Technical Research and Innovation 2021–2023; project PID2020-116540RB-C22 funded by MCIN/AEI/10.13039/501100011033; project EGMS RASTOOL: European ground motion risk assessment tool (Grant Agreement No. 101048474)Resumen
Interferometric synthetic aperture radar (InSAR) is a
remote sensing tool used for monitoring urban areas affected by
geological hazards. Here we analysed the effectiveness of stabilization
works on a slow-moving landslide in Arcos de La Frontera
(Cádiz, Spain) using a persistent scatterer interferometric approach.
The works consisted on jet grouting of cement-based injections and
were applied locally to stabilize the most damaged neighbourhood.
We processed a large stack of Sentinel-1 SAR satellite acquisitions
covering the period January, 2016, to March, 2023, and obtained
surface velocity and displacement trends measured along the line
of sight (LOS) of the satellite on both ascending and descending
orbits. The results show a clear deceleration of the landslide head
after mid-2018, suggesting the local stabilization works were effective
after that time. Prior to mid-2018, the maximum LOS velocity
of the landslide head was 2.2 cm/year in ascending orbit and
1.3 cm/year in the descending orbit, decreasing to 0.43 cm/year and
0.23 cm/year, respectively. The InSAR results were compared to insitu
monitoring data and revealed that the extent of the stabilization
has influenced a much larger area beyond the zone of the local
interventions. Overall, InSAR has proved a powerful and versatile
tool to be implemented in operational geotechnical monitoring.