Article (Scientific journals)
Challenges in comparing land subsidence measurements by PS-InSAR with simulations from coupled hydro-geomechanical modelling: a case study in Antwerp Harbour
Choopani, Atefe; Orban, Philippe; Declercq, P. Y. et al.
2025In Hydrogeology Journal
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Keywords :
Subsidence; Aquitard compaction; Swelling; Numerical modelling; Groundwater; Induced subsidence; persistent scatterer interferometry; geomechanical modelling; Antwerp area; PS-InSAR; land subsidence
Abstract :
[en] Land subsidence is a serious problem in rapidly urbanizing areas like Antwerp, Belgium, where one known driver is the consolidation of Holocene sediments beneath the harbour’s backfill. However, the potential contribution of groundwater abstraction to subsidence remains poorly understood, as deformation measurements from interferometric synthetic aperture radar (InSAR) alone cannot pinpoint subsurface processes. This study addresses this gap by investigating whether groundwater-induced consolidation also plays a role in subsidence in Antwerp Harbour. In this work, deformation estimates derived from persistent scatterer InSAR (PS-InSAR) and a 3D-MODFLOW groundwater flow model, sequentially coupled to a 1D-geomechanical model implemented in Python. The model captures delayed consolidation in low-permeability units. For modelling, a region outside the harbour’s backfill was selected to exclude the influence of harbour sediment consolidation and isolate the potential role of groundwater abstraction, comparing observed and simulated deformations. Results show groundwater-induced consolidation contributes to subsidence rates of 1.78 mm/year (2009–2016), closely matching PS-InSAR estimates of –2.67, –2.39 and –2.43 mm/year from SkyGeo (2017–2022), EGMS (2019–2023), and TerraSAR-X (2019–2022), respectively. Validation of the PS-InSAR datasets was performed using GNSS station BEZA, with the EGMS showing the best fit. Results reveal groundwater level changes contribute to subsidence beyond natural sediment consolidation, although challenges such as data scarcity complicate direct comparisons. The insights point to groundwater as a likely additional factor in regional subsidence and emphasize the importance of improved data integration for refining hydro-geomechanical models to enhance subsidence predictions.
Research Center/Unit :
UEE - Urban and Environmental Engineering - ULiège
Disciplines :
Geological, petroleum & mining engineering
Author, co-author :
Choopani, Atefe  ;  Université de Liège - ULiège > Urban and Environmental Engineering  ; IRSNB - Royal Belgian Institute of Natural Sciences > Geological Survey of Belgium ; KU Leuven - Catholic University of Leuven > Nature and Landscape > Division of Forest
Orban, Philippe  ;  Université de Liège - ULiège > Urban and Environmental Engineering
Declercq, P. Y. ;  IRSNB - Royal Belgian Institute of Natural Sciences > Geological Survey of Belgium
Devleeschouwer, X. ;  IRSNB - Royal Belgian Institute of Natural Sciences > Geological Survey of Belgium
Dassargues, Alain  ;  Université de Liège - ULiège > Département ArGEnCo
Language :
English
Title :
Challenges in comparing land subsidence measurements by PS-InSAR with simulations from coupled hydro-geomechanical modelling: a case study in Antwerp Harbour
Publication date :
13 November 2025
Journal title :
Hydrogeology Journal
ISSN :
1431-2174
eISSN :
1435-0157
Publisher :
Springer Science and Business Media LLC
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
BRAIN-Belspo project LASUGEO, Monitoring LAnd SUbsidence caused by Groundwater exploitation through gEOdetic measurements
Funders :
BELSPO - Belgian Federal Science Policy Office
Funding number :
BRAIN B2/191/P1/LASUGEO
Funding text :
Thanks also to the European Space Agency (ESA) for providing the satellite images and to the DOV Databank Ondergrond Vlaanderen for the hydrogeological data. We also thank EGMS and SkyGeo for providing complementary data for comparison with our PS-InSAR data.
Available on ORBi :
since 17 November 2025

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