Research Fellow: Anne-Karin Cooke
hosted by µQuans (until June 2019) and University of Montpellier (since June 2019)
Cédric Champollion Géosciences Montpellier
Pierre Vermeulen, µQuans
University of Montpellier (2017, 2018, 2019)
The objective is the field validation of the first AQG against the most accurate gravimeters located at fixed stations at H+ Larzac and LSBB sites. The AQG will be used to estimate the contribution of different water storage reservoirs in complement to vertically resolved complementary measurements (ERT, RMP, borehole logging) and later coupled with soil moisture and gravity measurements the HOBE observatory.
Gravity measurements are pertinent to monitor water balance from local to basin scale and can provide accurate constrains on the water storage dynamics of subsurface reservoirs. One major characteristic of gravity measurements is the integration of all water masses across scales: gravity variations can be the effect of continental scale soil humidity or aquifer (such as seen by GRACE measurements) and of local effects (such as the umbrella effect of a building or reservoir heterogeneities).
This technique can provide an estimation of the water storage spatial variability at kilometer scale with an integration scale of about 100 m. μQuans is developing a new absolute quantum gravimeter (AQG), fast and transportable (sensor ~30 kg). The AQG is a real technological breakthrough compared to current portable gravimeters, which provide relative measurements. It will allow a more efficient and precise mapping of gravity in space and time.
Tasks & Methodology
My task is to perform the field validation of the first AQG against the most accurate gravimeters located at fixed stations.
Afterwards the AQG will be used to estimate the contribution of different water storages in complement to other (hydro-)geophysical methods. An additional task are numerical modelling studies on the potential of vertical gravity gradient monitoring for the detection of significant hydrological signals, based on gradient time series.
Data & Datasets
Dissemination and communication
May 3rd : Presentation “Detection of subsurface water storage dynamics with combined gravity – vertical gravity gradient monitoring and hydrological simulation” https://doi.org/10.5194/egusphere-egu2020-9020
October 7th-9th: Participation to the “16. PhD-Workshop: Hydrological modelling across different landscapes” at the University Freiburg, Germany, organized by the Deutsche Hydrologische Gesellschaft
July 11th – 12th: “Researchers meet innovators” event organized by the Marie Curie Alumni Association at the Technical University Berlin
June 4th : Presentation at the 24th H+ Network Meeting : “Can vertical gravity gradients monitor seasonal soil moisture dynamics? – Gravity gradient observations and coupled hydro-gravimetrical modelling in Karsts”
April 7- 12: Presentation at the EGU General Assembly, Vienna (Austria): “Potential Impact of groundbased gravity gradiometer for subsurface reservoir monitoring“
- Poster presentations at two doctoral school days:
- 22/03/2018 Montpellier: Journée de Doctorants: Institut Montpelliérain de l’Eau et de L’Environnement (IM2E) ( http://www.im2e.org/)
- 18/05/2018 Montpellier: Journée des doctorants Géosciences Montpellier
Several introduction courses at doctoral school GAIA (Umontpellier) and a day seminar on ethics in science (also by GAIA)
(Formation à l’éthique de la recherche et à l’intégrité scientifique)
Poster for the 4th Cargèse Summer School: “On the potential of vertical gravity gradient monitoring for hydrological signal detection“