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Understanding the geodetic signature of large aquifer systems: Example of the Ozark Plateaus in Central United States

Larochelle, Stacy and Chanard, Kristel and Fleitout, Luce and Fortin, Jerome and Gualandi, Adriano and Longuevergne, Laurent and Rebischung, Paul and Violette, Sophie and Avouac, Jean-Philippe (2021) Understanding the geodetic signature of large aquifer systems: Example of the Ozark Plateaus in Central United States. . (Unpublished) https://resolver.caltech.edu/CaltechAUTHORS:20211012-211827889

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Abstract

The continuous redistribution of water mass involved in the hydrologic cycle leads to deformation of the solid Earth. On a global scale, this deformation is well explained by redistribution in surface loading and can be quantified to first order with space-based gravimetric and geodetic measurements. At the regional scale, however, aquifer systems also undergo poroelastic deformation in response to groundwater fluctuations. Disentangling these related but distinct 3D deformation fields from geodetic time series is essential to accurately invert for changes in continental water mass, to understand the mechanical response of aquifers to internal pressure changes as well as to correct time series for these known effects. Here, we demonstrate a methodology to accomplish this task by considering the example of the well-instrumented Ozark Plateaus Aquifer System (OPAS) in central United States. We begin by characterizing the most important sources of signal in the spatially heterogeneous groundwater level dataset using an Independent Component Analysis. Then, to estimate the associated poroelastic displacements, we project geodetic time series corrected for surface loading effects onto orthogonalized versions of the groundwater temporal functions. We interpret the extracted displacements in light of analytical solutions and a 2D model relating groundwater level variations to surface displacements. In particular, the relatively low estimates of elastic moduli inferred from the poroelastic displacements and groundwater fluctuations may be indicative of surficial layers with a high fracture density. Our findings suggest that OPAS undergoes significant poroelastic deformation, including highly heterogeneous horizontal poroelastic displacements.


Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription
https://doi.org/10.1002/essoar.10507870.1DOIDiscussion Paper
https://waterservices.usgs.govRelated ItemUSGS groundwater level
https://podaac.jpl.nasa.gov/dataset/GRACE_GSM_L2_GRAV_CSR_RL06Related ItemCSR GRACE time series
http://geodesy.unr.eduRelated ItemNGL GNSS time series
http://dx.doi.org/10.5066/F7HQ3X0TDOIOzark Plateaus Aquifer System model
ORCID:
AuthorORCID
Larochelle, Stacy0000-0001-6161-5605
Chanard, Kristel0000-0001-9934-9621
Fleitout, Luce0000-0003-1114-3616
Gualandi, Adriano0000-0002-3100-8932
Longuevergne, Laurent0000-0003-3169-743X
Rebischung, Paul0000-0002-2462-1886
Violette, Sophie0000-0002-3031-2852
Avouac, Jean-Philippe0000-0002-3060-8442
Additional Information:The copyright holder for this preprint is the author/funder. Funders: Natural Sciences and Engineering Research Council of Canada Grant Number: PGSD-3-517078-2018; Recipient: Stacy Larochelle. Office for Science and Technology of the Embassy of France in the United States Grant Number: 2019-2020 STEM Chateaubriand Fellowship; Recipient: Stacy Larochelle. Institute of Physics of the Globe of Paris Grant Number: IPGP contribution #4232; Recipient: Kristel Chanard. Institute of Physics of the Globe of Paris Grant Number: IPGP contribution #4232; Recipient: Paul Rebischung. The USGS groundwater level, CSR GRACE and NGL GNSS time series used in this work are available at https://waterservices.usgs.gov, https://podaac.jpl.nasa.gov/dataset/GRACE_GSM_L2_GRAV_CSR_RL06 and http://geodesy.unr.edu, respectively. The Ozark Plateaus Aquifer System model of Westerman et al. (2016) is available at http://dx.doi.org/10.5066/F7HQ3X0T.
Funders:
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of CanadaPGSD-3-517078-2018
Office for Science and Technology of the Embassy of France in the United States2019-2020 STEM Chateaubriand Fellowshi
Institute of Physics of the Globe of Paris4232
DOI:10.1002/essoar.10507870.1
Record Number:CaltechAUTHORS:20211012-211827889
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20211012-211827889
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:111378
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:13 Oct 2021 17:11
Last Modified:13 Oct 2021 17:11

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