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Land subsidence observed in the Merchtem area (Flanders) – 30 years of SAR data associated to groundwater withdrawal?
Choopani, Atefe; Declercq, Pierre-Yves; Dassargues, Alain et al.
2021In IGARSS2021 Proceedings
Peer reviewed
 

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Keywords :
Land subsidence; PSInSAR; groundwater pumping; aquifer withdrawal
Abstract :
[en] A land subsidence affecting several towns at the joining limits of the Belgian Provinces of East Flanders, Antwerp and Flemish Brabant is followed during the last three decades. ERS 1-2, ENVISAT, TerraSAR-X and Sentinel 1A satellites SAR scenes were processed from 1992 till October 2020 to map the land subsidence evolution. The subsidence corresponds to a surface area of 220 km² during the ERS1/2 time interval distributed over three distinct subsidence bowls. During the ENVISAT and TerraSAR-X time interval, only one residual subsidence bowl was mapped affecting a surface area of about 70 km². Several towns (Londerzeel and Steenhuffel) remained in the center of the subsidence bowl. The annual average negative velocity values range between -5.99 and -0.5 mm/year. More recently, during the Sentinel 1A period, the subsidence bowl has lost half of its surface reaching 36 km². The velocity values have also decreased during the period 2016-2020.
Disciplines :
Geological, petroleum & mining engineering
Author, co-author :
Choopani, Atefe
Declercq, Pierre-Yves;  Royal Belgian Institute of Natural Sciences > Geological Survey of Belgium
Dassargues, Alain  ;  Université de Liège - ULiège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Devleeschouwer, Xavier;  Royal Belgian Institute of Natural Sciences > Geological Survey of Belgium
Language :
English
Title :
Land subsidence observed in the Merchtem area (Flanders) – 30 years of SAR data associated to groundwater withdrawal?
Publication date :
12 July 2021
Event name :
IGARSS2021
Event organizer :
IEEE-Geoscience and Remote Sensing Society
Event place :
Brussels, Belgium
Event date :
12-16 July 2021
Audience :
International
Main work title :
IGARSS2021 Proceedings
Peer reviewed :
Peer reviewed
Name of the research project :
LASUGEO
Funders :
Politique Scientifique Fédérale (Belgique) - BELSPO
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