EGU21-15146, updated on 04 Mar 2021
https://doi.org/10.5194/egusphere-egu21-15146
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Surface deformations observed by GPS and its relation to groundwater variations in France

Anita Thea Saraswati1, Kuei-Hua Hsu2, Tonie van Dam3,4, and Annette Eicker2
Anita Thea Saraswati et al.
  • 1University of Luxembourg, Esch-sur-Alzette, Luxembourg (anita.saraswati@uni.lu)
  • 2Geodesy & Geoinformatics, HafenCity University Hamburg, Hambourg, Germany
  • 3Interdisciplinary Centre for Security, Reliability and Trust, University of Luxembourg, Luxembourg
  • 4University of Utah, Salt Lake City, UT, United States

The Global Positioning System (GPS) measures surface displacements in response to time-varying terrestrial water mass variations. Components of surface water storage include water in lakes and reservoirs, snow, and soil moisture. Groundwater depletion or recharge will also contribute to the overall water storage. Understanding the nature of the observed GPS displacements related to the continental water variations is important to help identify which compartment in the total water storage controls the water changes in any particular region. In this study, we demonstrate the potential of GPS to observe the surface displacements induced by groundwater variations in France. In-situ groundwater observations from boreholes in France are used to be compared with GPS displacements. Groundwater data are processed to obtain the Equivalent Water Height (EWH) and used to forward model surface deformation. Displacements predicted using EWH variations from the WaterGAP Global Hydrology Model (WGHM) will also be compared to the GPS displacements.

How to cite: Saraswati, A. T., Hsu, K.-H., van Dam, T., and Eicker, A.: Surface deformations observed by GPS and its relation to groundwater variations in France, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-15146, https://doi.org/10.5194/egusphere-egu21-15146, 2021.

Display materials

Display file