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dc.contributor.author
Patterson, James W.
dc.contributor.author
Driesner, Thomas
dc.date.accessioned
2021-03-04T09:06:23Z
dc.date.available
2021-03-04T04:22:02Z
dc.date.available
2021-03-04T09:06:23Z
dc.date.issued
2021-02
dc.identifier.issn
2169-9313
dc.identifier.issn
0148-0227
dc.identifier.issn
2169-9356
dc.identifier.other
10.1029/2020JB020940
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/472826
dc.description.abstract
Natural groundwater convection in fractures is an important mechanism of mass and heat transfer in the subsurface, locally altering temperature by several tens of degrees. The thermoelastic stresses resulting from these thermal anomalies induce thermal strains, which in turn alter the transmissivity (permeability times thickness) of the fracture and, therefore, the convective flow within. We investigate the effect of thermal strains on fracture convection patterns using a three‐dimensional thermo‐hydraulic‐mechanical numerical model, implementing the Barton‐Bandis relationship between fracture transmissivity and effective normal stress, which results in a downward‐narrowing of the fractures. When thermoelasticity is not taken into account, convection forms narrow upflow zones and wide downflow zones. Decreasing fracture stiffness results in similar upflow/downflow patterns, but restricted to the shallow portions of the fracture, creating relatively minor thermal changes. When thermo‐elasticity is included in the model, thermal strains induced by cool downflow zones create narrow high‐transmissivity channels within the fracture, allowing convective flow to reach greater depths and significantly reducing the geothermal gradient near the fracture. Fracture stiffness is a key parameter in determining convection depth and thermal perturbation strength for a given set of host rock mechanical properties. When fracture stiffness is below some threshold, subsequent contractive thermoelastic strains were found to induce tensile failure of the host rock below the fracture, propagating and deepening the fracture into the host rock. This observation provides support to the previously proposed concept of convective downward migration. © 2020 American Geophysical Union
en_US
dc.language.iso
en
en_US
dc.publisher
American Geophysical Union
en_US
dc.subject
convection
en_US
dc.subject
fracture flow
en_US
dc.subject
fracture propagation
en_US
dc.subject
geomechanics
en_US
dc.subject
thermomechanics
en_US
dc.subject
THM
en_US
dc.title
Elastic and Thermoelastic Effects on Thermal Water Convection in Fracture Zones
en_US
dc.type
Journal Article
dc.date.published
2020-12-22
ethz.journal.title
Journal of Geophysical Research: Solid Earth
ethz.journal.volume
126
en_US
ethz.journal.issue
2
en_US
ethz.journal.abbreviated
J. geophys. res. Solid earth
ethz.pages.start
e2020JB020940
en_US
ethz.size
18 p.
en_US
ethz.grant
Modelling permeability and stimulation for deep heat mining
en_US
ethz.grant
Key problems of heat and mass transfer in the earth's crust
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Washington, DC
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02725 - Institut für Geochemie und Petrologie / Institute of Geochemistry and Petrology::08822 - Driesner, Thomas (Tit.-Prof.)
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02725 - Institut für Geochemie und Petrologie / Institute of Geochemistry and Petrology::08822 - Driesner, Thomas (Tit.-Prof.)
ethz.grant.agreementno
153971
ethz.grant.agreementno
172851
ethz.grant.fundername
SNF
ethz.grant.fundername
SNF
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.program
NFP 70: Gesuch
ethz.grant.program
Projekte MINT
ethz.relation.isSupplementedBy
10.3929/ethz-b-000432644
ethz.date.deposited
2021-03-04T04:22:10Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2021-03-04T09:06:33Z
ethz.rosetta.lastUpdated
2022-03-29T05:36:43Z
ethz.rosetta.versionExported
true
ethz.COinS
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