Groundwater Flooding on Atolls Caused by Storm Surges: Effects of the Dual-Aquifer Configuration

Storm surges associated with tropical cyclones endanger atolls through groundwater flooding, where groundwater is discharged from the land surface as the sea level rises. Atolls are characterized by a “dual-aquifer” configuration, where recent Holocene sediments unconformably overlie highly permeabl...

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Detalles Bibliográficos
Autores: Tajima, Satoshi, Brunner, Philip, Liu, Jiaqi, Delottier, Hugo, Tokunaga, Tomochika
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2023
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/337551
Acceso en línea:http://hdl.handle.net/10261/337551
https://api.elsevier.com/content/abstract/scopus_id/85173620487
Access Level:acceso abierto
Palabra clave:Storm surge
Atoll
Cyclone
Groundwater flooding
HydroGeoSphere
http://metadata.un.org/sdg/13
Take urgent action to combat climate change and its impacts
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spelling Groundwater Flooding on Atolls Caused by Storm Surges: Effects of the Dual-Aquifer ConfigurationTajima, SatoshiBrunner, PhilipLiu, JiaqiDelottier, HugoTokunaga, TomochikaStorm surgeAtollCycloneGroundwater floodingHydroGeoSpherehttp://metadata.un.org/sdg/13Take urgent action to combat climate change and its impactsStorm surges associated with tropical cyclones endanger atolls through groundwater flooding, where groundwater is discharged from the land surface as the sea level rises. Atolls are characterized by a “dual-aquifer” configuration, where recent Holocene sediments unconformably overlie highly permeable Pleistocene limestone, creating an interface called a “Thurber discontinuity.” This study aimed to quantitatively analyze how the dual-aquifer configuration of atolls controls the temporal dynamics of groundwater flooding caused by storm surge. To this end, we ran surface-subsurface coupled synthetic numerical simulations using HydroGeoSphere and compared 12 scenarios with different Thurber discontinuity elevations and hydraulic conductivities of the Pleistocene aquifer (KP). The results showed that the shallower the Thurber discontinuity and the higher the KP value, the higher the maximum water depth in the freshwater swamp on the atoll during the storm surge and the longer the flooding duration. Despite the effects of the different dual-aquifer configurations, the initial water table elevation and salinity distribution were almost identical in all the simulation cases. These findings suggest that accurate information on the dual-aquifer configuration is necessary to evaluate the potential risk of groundwater flooding on atolls accompanying storm surges. Furthermore, the results indicate that groundwater flooding caused by storm surges substantially contributes to cyclone-driven flooding on atolls, and hence, it should not be neglected in flood predictions to avoid underestimation.The authors are grateful to the three anonymous reviewers for their insightful comments and invaluable suggestions. This study was financially supported by a JSPS Bilateral Joint Research Project (JPJSBP-120219908). S. Tajima thanks the financial support of the World-Leading Innovative Graduate Study Program in Proactive Environmental Studies (WINGS-PES) at the University of Tokyo.Peer reviewedWiley-Blackwell0000-0002-9437-54730000-0001-6304-62740000-0002-3243-2743Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202320232023info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/337551https://api.elsevier.com/content/abstract/scopus_id/85173620487reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésWater Resources Researchhttps://doi.org/10.1029/2023WR034762Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3375512026-05-22T06:33:51Z
dc.title.none.fl_str_mv Groundwater Flooding on Atolls Caused by Storm Surges: Effects of the Dual-Aquifer Configuration
title Groundwater Flooding on Atolls Caused by Storm Surges: Effects of the Dual-Aquifer Configuration
spellingShingle Groundwater Flooding on Atolls Caused by Storm Surges: Effects of the Dual-Aquifer Configuration
Tajima, Satoshi
Storm surge
Atoll
Cyclone
Groundwater flooding
HydroGeoSphere
http://metadata.un.org/sdg/13
Take urgent action to combat climate change and its impacts
title_short Groundwater Flooding on Atolls Caused by Storm Surges: Effects of the Dual-Aquifer Configuration
title_full Groundwater Flooding on Atolls Caused by Storm Surges: Effects of the Dual-Aquifer Configuration
title_fullStr Groundwater Flooding on Atolls Caused by Storm Surges: Effects of the Dual-Aquifer Configuration
title_full_unstemmed Groundwater Flooding on Atolls Caused by Storm Surges: Effects of the Dual-Aquifer Configuration
title_sort Groundwater Flooding on Atolls Caused by Storm Surges: Effects of the Dual-Aquifer Configuration
dc.creator.none.fl_str_mv Tajima, Satoshi
Brunner, Philip
Liu, Jiaqi
Delottier, Hugo
Tokunaga, Tomochika
author Tajima, Satoshi
author_facet Tajima, Satoshi
Brunner, Philip
Liu, Jiaqi
Delottier, Hugo
Tokunaga, Tomochika
author_role author
author2 Brunner, Philip
Liu, Jiaqi
Delottier, Hugo
Tokunaga, Tomochika
author2_role author
author
author
author
dc.contributor.none.fl_str_mv 0000-0002-9437-5473
0000-0001-6304-6274
0000-0002-3243-2743
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Storm surge
Atoll
Cyclone
Groundwater flooding
HydroGeoSphere
http://metadata.un.org/sdg/13
Take urgent action to combat climate change and its impacts
topic Storm surge
Atoll
Cyclone
Groundwater flooding
HydroGeoSphere
http://metadata.un.org/sdg/13
Take urgent action to combat climate change and its impacts
description Storm surges associated with tropical cyclones endanger atolls through groundwater flooding, where groundwater is discharged from the land surface as the sea level rises. Atolls are characterized by a “dual-aquifer” configuration, where recent Holocene sediments unconformably overlie highly permeable Pleistocene limestone, creating an interface called a “Thurber discontinuity.” This study aimed to quantitatively analyze how the dual-aquifer configuration of atolls controls the temporal dynamics of groundwater flooding caused by storm surge. To this end, we ran surface-subsurface coupled synthetic numerical simulations using HydroGeoSphere and compared 12 scenarios with different Thurber discontinuity elevations and hydraulic conductivities of the Pleistocene aquifer (KP). The results showed that the shallower the Thurber discontinuity and the higher the KP value, the higher the maximum water depth in the freshwater swamp on the atoll during the storm surge and the longer the flooding duration. Despite the effects of the different dual-aquifer configurations, the initial water table elevation and salinity distribution were almost identical in all the simulation cases. These findings suggest that accurate information on the dual-aquifer configuration is necessary to evaluate the potential risk of groundwater flooding on atolls accompanying storm surges. Furthermore, the results indicate that groundwater flooding caused by storm surges substantially contributes to cyclone-driven flooding on atolls, and hence, it should not be neglected in flood predictions to avoid underestimation.
publishDate 2023
dc.date.none.fl_str_mv 2023
2023
2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/337551
https://api.elsevier.com/content/abstract/scopus_id/85173620487
url http://hdl.handle.net/10261/337551
https://api.elsevier.com/content/abstract/scopus_id/85173620487
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Water Resources Research
https://doi.org/10.1029/2023WR034762
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Wiley-Blackwell
publisher.none.fl_str_mv Wiley-Blackwell
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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