Regional groundwater modeling of the guarani aquifer system

Detalhes bibliográficos
Autor(a) principal: Gonçalves, Roger D. [UNESP]
Data de Publicação: 2020
Outros Autores: Teramoto, Elias H. [UNESP], Chang, Hung K. [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.3390/W12092323
http://hdl.handle.net/11449/199338
Resumo: The Guarani Aquifer System (GAS) is a strategic transboundary aquifer system shared by Brazil, Argentina, Paraguay and Uruguay. This article presents a groundwater flow model to assess the GAS system in terms of regional flow patterns, water balance and overall recharge. Despite the continental dimension of GAS, groundwater recharge is restricted to narrow outcrop zones. An important part is discharged into local watersheds, whereas a minor amount reaches the confined part. A three-dimensional finite element groundwater-flow model of the entire GAS system was constructed to obtain a better understanding of the prevailing flow dynamics and more reliable estimates of groundwater recharge. Our results show that recharge rates effectively contributing to the regional GAS water balance are only approximately 0.6 km3/year (about 4.9 mm/year). These rates are much smaller than previous estimates, including of deep recharge approximations commonly used for water resources management. Higher recharge rates were also not compatible with known 81Kr groundwater age estimates, as well as with calculated residence times using a particle tracking algorithm.
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spelling Regional groundwater modeling of the guarani aquifer systemFinite element method (FEM)Groundwater ageGroundwater modelingGroundwater rechargeGuarani Aquifer System (GAS)Numerical modelingWater resources managementThe Guarani Aquifer System (GAS) is a strategic transboundary aquifer system shared by Brazil, Argentina, Paraguay and Uruguay. This article presents a groundwater flow model to assess the GAS system in terms of regional flow patterns, water balance and overall recharge. Despite the continental dimension of GAS, groundwater recharge is restricted to narrow outcrop zones. An important part is discharged into local watersheds, whereas a minor amount reaches the confined part. A three-dimensional finite element groundwater-flow model of the entire GAS system was constructed to obtain a better understanding of the prevailing flow dynamics and more reliable estimates of groundwater recharge. Our results show that recharge rates effectively contributing to the regional GAS water balance are only approximately 0.6 km3/year (about 4.9 mm/year). These rates are much smaller than previous estimates, including of deep recharge approximations commonly used for water resources management. Higher recharge rates were also not compatible with known 81Kr groundwater age estimates, as well as with calculated residence times using a particle tracking algorithm.Center for Environmental Studies and Basin Studies Laboratory São Paulo State University UNESPDepartment of Applied Geology and Basin Studies Laboratory São Paulo State University UNESPCenter for Environmental Studies and Basin Studies Laboratory São Paulo State University UNESPDepartment of Applied Geology and Basin Studies Laboratory São Paulo State University UNESPUniversidade Estadual Paulista (Unesp)Gonçalves, Roger D. [UNESP]Teramoto, Elias H. [UNESP]Chang, Hung K. [UNESP]2020-12-12T01:37:03Z2020-12-12T01:37:03Z2020-09-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.3390/W12092323Water (Switzerland), v. 12, n. 9, 2020.2073-4441http://hdl.handle.net/11449/19933810.3390/W120923232-s2.0-850902651161989662459244838Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengWater (Switzerland)info:eu-repo/semantics/openAccess2021-10-23T07:14:44Zoai:repositorio.unesp.br:11449/199338Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T21:10:42.602677Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Regional groundwater modeling of the guarani aquifer system
title Regional groundwater modeling of the guarani aquifer system
spellingShingle Regional groundwater modeling of the guarani aquifer system
Gonçalves, Roger D. [UNESP]
Finite element method (FEM)
Groundwater age
Groundwater modeling
Groundwater recharge
Guarani Aquifer System (GAS)
Numerical modeling
Water resources management
title_short Regional groundwater modeling of the guarani aquifer system
title_full Regional groundwater modeling of the guarani aquifer system
title_fullStr Regional groundwater modeling of the guarani aquifer system
title_full_unstemmed Regional groundwater modeling of the guarani aquifer system
title_sort Regional groundwater modeling of the guarani aquifer system
author Gonçalves, Roger D. [UNESP]
author_facet Gonçalves, Roger D. [UNESP]
Teramoto, Elias H. [UNESP]
Chang, Hung K. [UNESP]
author_role author
author2 Teramoto, Elias H. [UNESP]
Chang, Hung K. [UNESP]
author2_role author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Gonçalves, Roger D. [UNESP]
Teramoto, Elias H. [UNESP]
Chang, Hung K. [UNESP]
dc.subject.por.fl_str_mv Finite element method (FEM)
Groundwater age
Groundwater modeling
Groundwater recharge
Guarani Aquifer System (GAS)
Numerical modeling
Water resources management
topic Finite element method (FEM)
Groundwater age
Groundwater modeling
Groundwater recharge
Guarani Aquifer System (GAS)
Numerical modeling
Water resources management
description The Guarani Aquifer System (GAS) is a strategic transboundary aquifer system shared by Brazil, Argentina, Paraguay and Uruguay. This article presents a groundwater flow model to assess the GAS system in terms of regional flow patterns, water balance and overall recharge. Despite the continental dimension of GAS, groundwater recharge is restricted to narrow outcrop zones. An important part is discharged into local watersheds, whereas a minor amount reaches the confined part. A three-dimensional finite element groundwater-flow model of the entire GAS system was constructed to obtain a better understanding of the prevailing flow dynamics and more reliable estimates of groundwater recharge. Our results show that recharge rates effectively contributing to the regional GAS water balance are only approximately 0.6 km3/year (about 4.9 mm/year). These rates are much smaller than previous estimates, including of deep recharge approximations commonly used for water resources management. Higher recharge rates were also not compatible with known 81Kr groundwater age estimates, as well as with calculated residence times using a particle tracking algorithm.
publishDate 2020
dc.date.none.fl_str_mv 2020-12-12T01:37:03Z
2020-12-12T01:37:03Z
2020-09-01
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.3390/W12092323
Water (Switzerland), v. 12, n. 9, 2020.
2073-4441
http://hdl.handle.net/11449/199338
10.3390/W12092323
2-s2.0-85090265116
1989662459244838
url http://dx.doi.org/10.3390/W12092323
http://hdl.handle.net/11449/199338
identifier_str_mv Water (Switzerland), v. 12, n. 9, 2020.
2073-4441
10.3390/W12092323
2-s2.0-85090265116
1989662459244838
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Water (Switzerland)
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
_version_ 1808129294150402048