PSI - Issue 84

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ScienceDirect

Procedia Structural Integrity 84 (2026) 1167–1174

© 2026 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Conference Keywords: Remote sensing; 3D Numerical Modelling; Landslide-bridge interaction; Combined Approach. Abstract The interaction between landslides and infrastructure requires tools capable of describing both the evolution of slope movements and their effects on structural elements. This study presents an integrated approach that combines satellite interferometric data (InSAR) and three-dimensional numerical modelling, applied to a real case study involving an active landslide that partially affects a bridge. The InSAR analysis, based on EGMS ascending and descending data, enabled monitoring of surface displacements and the estimation of actual movement components through regular-grid resampling and two-dimensional decomposition. The intrinsic limitation of satellite data, related to its one-dimensional nature along the Line of Sight, was addressed through numerical modelling, which allowed for the decomposition of displacements along the main landslide direction, reconstructing the movement trajectory. The numerical model revealed significant displacements in the bridge’s structural elements, with downstream tilting induced by the horizontal thrust of the landslide. Interferometric data highlighted substantial movement upstream of the bridge, in agreement with the critical zones identified through modelling, which also provided information for the downstream sector where satellite data were unavailable. In conclusion, the combination of InSAR and numerical modelling provided complementary and more detailed information compared to the separate use of each technique, proving to be an effective tool for analysing landslide– infrastructure interaction in areas affected by slope instabilities. III Fabre Conference: Existing Bridges, Viaducts, and Tunnels: Research, Innovation, and Applications Using InSAR data and 3D numerical modelling to analyse the effect of landslide movement on roadway bridges Erica Cernuto a, *, Diana Salciarini a , Filipo Ubertini a , Giorgia Giardina b a Department of Civil and Environmental Engineering, University of Perugia, Via Goffredo Duranti, 93, Perugia, 06126, Italy b Department of Geoscience and Engineering, Delft University of Technology, Stevinweg 1, Delft, 2628 CN, The Netherlands

* Corresponding author. E-mail address: erica.cernuto@dottorandi.unipg.it

2452-3216 © 2026 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the Conference 10.1016/j.prostr.2026.06.149