Numerical modeling of reinjection and tracer transport in a shallow aquifer, Nesjavellir Geothermal System, Iceland
Abstract: Reinjection of excess water from the power production process in the Nesjavellir geothermal field has increased the temperature of shallow groundwaters, posing a risk to cold water wells used for the power plant as well as the ecosystem in Lake Thingvellir. Here, we present a numerical mod...
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Geothermal Energy
2022
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ftbancorepubldc:oai:babel.banrepcultural.org:p17054coll23/1860 2024-03-24T09:02:51+00:00 Numerical modeling of reinjection and tracer transport in a shallow aquifer, Nesjavellir Geothermal System, Iceland Gómez Díaz, Esteban Scott, Samuel Ratouis, Thomas Newson, Juliet Islandia 2022 PDF http://babel.banrepcultural.org/cdm/ref/collection/p17054coll23/id/1860 ENG - Inglés eng Geothermal Energy Colfuturo http://babel.banrepcultural.org/cdm/ref/collection/p17054coll23/id/1860 © Derechos reservados del autor Numerical modeling Geothermal reinjection Dual porosity MINC Tracer injection Fluid flow Heat transfer Ciencias naturales y matemáticas Ciencias naturales y matemáticas / Ciencias de la tierra Artículo 2022 ftbancorepubldc 2024-02-26T14:41:05Z Abstract: Reinjection of excess water from the power production process in the Nesjavellir geothermal field has increased the temperature of shallow groundwaters, posing a risk to cold water wells used for the power plant as well as the ecosystem in Lake Thingvellir. Here, we present a numerical model of fluid flow and heat transport in the shallow reinjection zone to elucidate the flow path of reinjected liquid and the impact of reinjection on the temperature of groundwaters. The permeability structure of the model is based on a 3D geological model of the area. The numerical simulation is calibrated against underground water temperature data measured between 1998 and 2018 and data from a tracer test performed in 2018–2019. The model reproduces the overall temperature field and shows how a highpermeability lava flow together with rift-parallel normal faults act as permeable channels controlling fluid transport. If injection continues, the temperature along the lava flow increases considerably and spreads vertically to much deeper levels, generating a narrow warm zone along the main fault. If shallow injection ceases, temperature drops rapidly at the surface, but decreases slowly around the reinjection zone over 20 years. The numerical model in this study allowed a better characterization of the fracture–matrix interface and the porosity of post-glacial lava flows, contributing to sustainable management of the geothermal resource and the surrounding environment. Article in Journal/Newspaper Iceland Islandia Colecciones digitales - Biblioteca Virtual del Banco de la República Nesjavellir ENVELOPE(-21.251,-21.251,64.115,64.115) |
institution |
Open Polar |
collection |
Colecciones digitales - Biblioteca Virtual del Banco de la República |
op_collection_id |
ftbancorepubldc |
language |
English |
topic |
Numerical modeling Geothermal reinjection Dual porosity MINC Tracer injection Fluid flow Heat transfer Ciencias naturales y matemáticas Ciencias naturales y matemáticas / Ciencias de la tierra |
spellingShingle |
Numerical modeling Geothermal reinjection Dual porosity MINC Tracer injection Fluid flow Heat transfer Ciencias naturales y matemáticas Ciencias naturales y matemáticas / Ciencias de la tierra Gómez Díaz, Esteban Scott, Samuel Ratouis, Thomas Newson, Juliet Numerical modeling of reinjection and tracer transport in a shallow aquifer, Nesjavellir Geothermal System, Iceland |
topic_facet |
Numerical modeling Geothermal reinjection Dual porosity MINC Tracer injection Fluid flow Heat transfer Ciencias naturales y matemáticas Ciencias naturales y matemáticas / Ciencias de la tierra |
description |
Abstract: Reinjection of excess water from the power production process in the Nesjavellir geothermal field has increased the temperature of shallow groundwaters, posing a risk to cold water wells used for the power plant as well as the ecosystem in Lake Thingvellir. Here, we present a numerical model of fluid flow and heat transport in the shallow reinjection zone to elucidate the flow path of reinjected liquid and the impact of reinjection on the temperature of groundwaters. The permeability structure of the model is based on a 3D geological model of the area. The numerical simulation is calibrated against underground water temperature data measured between 1998 and 2018 and data from a tracer test performed in 2018–2019. The model reproduces the overall temperature field and shows how a highpermeability lava flow together with rift-parallel normal faults act as permeable channels controlling fluid transport. If injection continues, the temperature along the lava flow increases considerably and spreads vertically to much deeper levels, generating a narrow warm zone along the main fault. If shallow injection ceases, temperature drops rapidly at the surface, but decreases slowly around the reinjection zone over 20 years. The numerical model in this study allowed a better characterization of the fracture–matrix interface and the porosity of post-glacial lava flows, contributing to sustainable management of the geothermal resource and the surrounding environment. |
format |
Article in Journal/Newspaper |
author |
Gómez Díaz, Esteban Scott, Samuel Ratouis, Thomas Newson, Juliet |
author_facet |
Gómez Díaz, Esteban Scott, Samuel Ratouis, Thomas Newson, Juliet |
author_sort |
Gómez Díaz, Esteban |
title |
Numerical modeling of reinjection and tracer transport in a shallow aquifer, Nesjavellir Geothermal System, Iceland |
title_short |
Numerical modeling of reinjection and tracer transport in a shallow aquifer, Nesjavellir Geothermal System, Iceland |
title_full |
Numerical modeling of reinjection and tracer transport in a shallow aquifer, Nesjavellir Geothermal System, Iceland |
title_fullStr |
Numerical modeling of reinjection and tracer transport in a shallow aquifer, Nesjavellir Geothermal System, Iceland |
title_full_unstemmed |
Numerical modeling of reinjection and tracer transport in a shallow aquifer, Nesjavellir Geothermal System, Iceland |
title_sort |
numerical modeling of reinjection and tracer transport in a shallow aquifer, nesjavellir geothermal system, iceland |
publisher |
Geothermal Energy |
publishDate |
2022 |
url |
http://babel.banrepcultural.org/cdm/ref/collection/p17054coll23/id/1860 |
op_coverage |
Islandia |
long_lat |
ENVELOPE(-21.251,-21.251,64.115,64.115) |
geographic |
Nesjavellir |
geographic_facet |
Nesjavellir |
genre |
Iceland Islandia |
genre_facet |
Iceland Islandia |
op_relation |
Colfuturo http://babel.banrepcultural.org/cdm/ref/collection/p17054coll23/id/1860 |
op_rights |
© Derechos reservados del autor |
_version_ |
1794403311058681856 |