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Article: Tide-induced seawater-groundwater circulation in a multi-layered coastal leaky aquifer system

TitleTide-induced seawater-groundwater circulation in a multi-layered coastal leaky aquifer system
Authors
KeywordsAnalytical solution
Coastal leaky aquifer system
Sea tide
Seawater-goundwater circulation
Submarine groundwater discharge
Issue Date2003
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jhydrol
Citation
Journal Of Hydrology, 2003, v. 274 n. 1-4, p. 211-224 How to Cite?
AbstractMean groundwater levels of a multi-layered coastal leaky aquifer system are considered. The system consists of an unconfined aquifer, a confined aquifer and a semi-permeable layer between them. Both exact asymptotic solutions and approximate perturbation solutions are derived for multi-sinusoidal-component sea tide. At inland places far from the coastline, the perturbation solutions show a good agreement with the exact asymptotic solutions. Due to the watertable-dependent transmissivity of the unconfined aquifer, the mean groundwater levels of the aquifer system stand considerably above the mean sea level even in the absence of net inland recharge of groundwater and rainfall. These lead to landward positive gradients of both the mean watertable and mean head in the region near the coastline, which consequently results in a seawater-groundwater cycle. Seawater is pumped into the unconfined aquifer by the sea tide and divided into two parts. One part returns to the sea driven by the mean watertable gradient. The rest part leaks into the confined aquifer through the semipermeable layer, and returns to the sea through the confined aquifer driven by the mean head gradient. The total discharge through the confined aquifer is significant for coastal leaky aquifer system with typical parameter values. This seawater-groundwater cycle has impacts on better understanding of submarine groundwater discharge and exchange of various chemicals such as nutrients and contaminants in coastal areas. If the observed mean water levels in coastal areas are used for estimating the net inland recharge, the enhancing processes of sea tide on the mean groundwater levels should be taken into account. Otherwise, the net inland recharge will be overestimated. © 2003 Elsevier Science B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/72840
ISSN
2015 Impact Factor: 3.043
2015 SCImago Journal Rankings: 1.743
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLi, Hen_HK
dc.contributor.authorJiao, JJen_HK
dc.date.accessioned2010-09-06T06:45:35Z-
dc.date.available2010-09-06T06:45:35Z-
dc.date.issued2003en_HK
dc.identifier.citationJournal Of Hydrology, 2003, v. 274 n. 1-4, p. 211-224en_HK
dc.identifier.issn0022-1694en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72840-
dc.description.abstractMean groundwater levels of a multi-layered coastal leaky aquifer system are considered. The system consists of an unconfined aquifer, a confined aquifer and a semi-permeable layer between them. Both exact asymptotic solutions and approximate perturbation solutions are derived for multi-sinusoidal-component sea tide. At inland places far from the coastline, the perturbation solutions show a good agreement with the exact asymptotic solutions. Due to the watertable-dependent transmissivity of the unconfined aquifer, the mean groundwater levels of the aquifer system stand considerably above the mean sea level even in the absence of net inland recharge of groundwater and rainfall. These lead to landward positive gradients of both the mean watertable and mean head in the region near the coastline, which consequently results in a seawater-groundwater cycle. Seawater is pumped into the unconfined aquifer by the sea tide and divided into two parts. One part returns to the sea driven by the mean watertable gradient. The rest part leaks into the confined aquifer through the semipermeable layer, and returns to the sea through the confined aquifer driven by the mean head gradient. The total discharge through the confined aquifer is significant for coastal leaky aquifer system with typical parameter values. This seawater-groundwater cycle has impacts on better understanding of submarine groundwater discharge and exchange of various chemicals such as nutrients and contaminants in coastal areas. If the observed mean water levels in coastal areas are used for estimating the net inland recharge, the enhancing processes of sea tide on the mean groundwater levels should be taken into account. Otherwise, the net inland recharge will be overestimated. © 2003 Elsevier Science B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jhydrolen_HK
dc.relation.ispartofJournal of Hydrologyen_HK
dc.rightsJournal of Hydrology. Copyright © Elsevier BV.en_HK
dc.subjectAnalytical solutionen_HK
dc.subjectCoastal leaky aquifer systemen_HK
dc.subjectSea tideen_HK
dc.subjectSeawater-goundwater circulationen_HK
dc.subjectSubmarine groundwater dischargeen_HK
dc.titleTide-induced seawater-groundwater circulation in a multi-layered coastal leaky aquifer systemen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0022-1694&volume=274 &issue=1-4&spage=211&epage=224&date=2003&atitle=Tide-induced+seawater-groundwater+circulation+in+a+multi-layered+coastal+leaky+aquifer+systemen_HK
dc.identifier.emailJiao, JJ:jjiao@hku.hken_HK
dc.identifier.authorityJiao, JJ=rp00712en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/S002-1694(02)00413-4en_HK
dc.identifier.scopuseid_2-s2.0-0037377258en_HK
dc.identifier.hkuros81080en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0037377258&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume274en_HK
dc.identifier.issue1-4en_HK
dc.identifier.spage211en_HK
dc.identifier.epage224en_HK
dc.identifier.isiWOS:000181647000013-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridLi, H=35769216800en_HK
dc.identifier.scopusauthoridJiao, JJ=7102382963en_HK

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