Factors controlling large-scale hydrodynamic convection in the Taupo Volcanic Zone (TVZ), New Zealand

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dc.contributor.author Ratouis, Thomas en
dc.contributor.author Zarrouk, Sadiq en
dc.date.accessioned 2017-09-03T23:31:25Z en
dc.date.available 2015-09-11 en
dc.date.issued 2016-01 en
dc.identifier.citation Geothermics, 59(Part B):236-251 Jan 2016 en
dc.identifier.issn 0375-6505 en
dc.identifier.uri http://hdl.handle.net/2292/35463 en
dc.description.abstract A review of the Taupo Volcanic Zone (TVZ) geothermal fields setting shows that most of these systems share the same general characteristics including a highly permeable or fractured subsurface, a capping structure, close proximity to a river or lake, and low topographical terrain. In a number of these fields, the presence of a surface water body is associated with the separation of the plume into two entities on both sides of the water body (e.g. Wairakei-Tauhara, Rotokawa, Ohaaki, Ngatamariki, Orakeikorako, Atiamuri, Mangakino, Kawerau and others). The aim of this work is to model a typical TVZ geothermal system to natural state using a single large-scale reservoir model. 2D numerical models were developed to include the total extent of the hydrothermal system from the surface down to the ductile impermeable crust. This is to explore the impact of the system’s internal (caprock vertical permeability and fault network) and external (surface water body and topography) settings on the size, shape and location of the convective geothermal plume. Simulations were conducted using the Super Critical-TOUGH2.2 numerical simulation code. Fault networks and an overlying caprock are found to have a critical role in the development of the geothermal reservoir providing a preferential pathway for the rising of geothermal fluid and trapping it within the subsurface. Surface water bodies such as lakes and rivers have only a limited shallow impact on the natural thermal output whereas the topography strongly influences the geometry of the thermal plume. en
dc.language English en
dc.publisher Elsevier en
dc.relation.ispartofseries Geothermics en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from http://sherpa.ac.uk/romeo/issn/0375-6505/ https://www.elsevier.com/about/our-business/policies/sharing en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title Factors controlling large-scale hydrodynamic convection in the Taupo Volcanic Zone (TVZ), New Zealand en
dc.type Journal Article en
dc.identifier.doi 10.1016/j.geothermics.2015.09.003 en
pubs.issue Part B en
pubs.begin-page 236 en
pubs.volume 59 en
dc.rights.holder Copyright: Elsevier en
pubs.author-url http://www.sciencedirect.com/science/article/pii/S0375650515001133 en
pubs.end-page 251 en
pubs.publication-status Published en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 520431 en
pubs.org-id Engineering en
pubs.org-id Engineering Science en
dc.identifier.eissn 1879-3576 en
pubs.record-created-at-source-date 2017-09-04 en
pubs.online-publication-date 2015-10-01 en


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