ESR N°8: Monitoring water storage changes with a new portable absolute quantum gravimeter

 

 

Research Fellow : Anne-Karin Cooke,

Find her on Linkedin !

Host Institution : µQuans, France
currently based at the University of Montpellier, Géosciences

Objectives

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.

More details about ESR8-project:


Secondments

  • Umontpellier: 28/08/2018-08/10/2017, 21/10/2017-05/02/2018, 16/02/2018 – 18/06/2018
  • UCPH:50 days during May & June 2019

Tasks and 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.

Supervisors

  • Cédric Champollion, Géosciences Montpellier
  • Pierre Vermeulen, µQuans

Project description

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.

Dissemination and communication

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Database for the future datasets : H+ database


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