Quantifying compressible groundwater storage by combining cross-hole seismic surveys and head response to atmospheric tides

Rau, Gabriel C., Acworth, R. Ian, Halloran, Landon J. S., Timms, Wendy A. and Cuthbert, Mark O. 2018, Quantifying compressible groundwater storage by combining cross-hole seismic surveys and head response to atmospheric tides, Journal of geophysical research: earth surface, vol. 123, no. 8, pp. 1910-1930, doi: 10.1029/2018JF004660.

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Title Quantifying compressible groundwater storage by combining cross-hole seismic surveys and head response to atmospheric tides
Author(s) Rau, Gabriel C.
Acworth, R. Ian
Halloran, Landon J. S.
Timms, Wendy A.ORCID iD for Timms, Wendy A. orcid.org/0000-0002-6114-5866
Cuthbert, Mark O.
Journal name Journal of geophysical research: earth surface
Volume number 123
Issue number 8
Start page 1910
End page 1930
Total pages 21
Publisher American Geophysical Union
Place of publication Washington, D.C.
Publication date 2018-08
ISSN 2169-9003
Summary Groundwater specific storage varies by orders of magnitude, is difficult to quantify, and prone to significant uncertainty. Estimating specific storage using aquifer testing is hampered by the nonuniqueness in the inversion of head data and the assumptions of the underlying conceptual model. We revisit confined poroelastic theory and reveal that the uniaxial specific storage can be calculated mainly from undrained poroelastic properties, namely, uniaxial bulk modulus, loading efficiency, and the Biot-Willis coefficient. In addition, literature estimates of the solid grain compressibility enables quantification of subsurface poroelastic parameters using field techniques such as cross-hole seismic surveys and loading efficiency from the groundwater responses to atmospheric tides. We quantify and compare specific storage depth profiles for two field sites, one with deep aeolian sands and another with smectitic clays. Our new results require bulk density and agree well when compared to previous approaches that rely on porosity estimates. While water in clays responds to stress, detailed sediment characterization from a core illustrates that the majority of water is adsorbed onto minerals leaving only a small fraction free to drain. This, in conjunction with a thorough analysis using our new method, demonstrates that specific storage has a physical upper limit of (Formula presented.) m−1. Consequently, if larger values are derived using aquifer hydraulic testing, then the conceptual model that has been used needs reappraisal. Our method can be used to improve confined groundwater storage estimates and refine the conceptual models used to interpret hydraulic aquifer tests.
Language eng
DOI 10.1029/2018JF004660
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2018, American Geophysical Union
Free to Read? No
Free to Read Start Date 2019-03-01
Persistent URL http://hdl.handle.net/10536/DRO/DU:30115011

Document type: Journal Article
Collection: School of Engineering
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