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dc.contributor.authorOlbert, Agnieszka Indiana
dc.contributor.authorHartnett, Michael
dc.contributor.authorDabrowski, Tomasz
dc.date.accessioned2016-06-01T13:52:42Z
dc.date.available2016-06-01T13:52:42Z
dc.date.issued2010-10-14
dc.identifier.citationOlbert, AI,Hartnett, M,Dabrowski, T,Kelleher, K (2010) 'Effects of complex hydrodynamic processes on the horizontal and vertical distribution of Tc-99 in the Irish Sea'. Science Of The Total Environment, 409 :150-161.en_IE
dc.identifier.issn1879-1026
dc.identifier.urihttp://hdl.handle.net/10379/5844
dc.descriptionJournal articleen_IE
dc.description.abstractThe increased discharge of Tc-99 from the Sellafield plant following the commissioning of the Enhance Actinide Removal Plant in 1994 was reflected in higher Tc-99 activity concentrations over much of the Irish Sea The presence of this radionuclide in the marine environment is of concern not only because of its long half life but also high bio-concentration factor in commercially valuable species such Norway lobster (Nephrops norvegicus) and common lobster (Homarus gammarus) Accurate predictions of the transport, and spatial and temporal distributions of Tc-99 in the Irish Sea have important environmental and commercial implications In this study transport of the Tc-99 material was simulated in order to develop an increased understanding of long-term horizontal and vertical distributions In particular impact of seasonal hydrodynamic features such as the summer stratification on the surface-to-bottom Tc-99 ratio was of interest Also material retention mechanisms within the western Irish Sea were explored and flushing rates under various release conditions and meteorological forcing were estimatedThe results show that highest vertical gradients are observed between June and July in the deepest regions of the North Channel and the western Irish Sea where radionuclide-rich saline-poor water overlays radionuclide-poor saline-rich Atlantic water masses Strong correlation between top-to-bottom ratio of Tc-99 and strength of stratification was found Flushing studies demonstrate that as the stratification intensifies residence times within the western Irish Sea increase In stratified waters of the gyre Tc-99 material is flushed out from the upper layer much quicker than from the bottom zoneThe research also shows that in the gyre the biologically active upper layers above the thermocline are likely to contain higher concentrations than the near-bed region Long-term horizontal and vertical distributions as determined in this study provide a basis for assessment of a potential biota exposure to Tc-99 (C) 2010 Elsevier B V All rights reserveden_IE
dc.description.sponsorshipRadiological Protection Institute of Ireland (RPII); Environmental Protection Agencyen_IE
dc.formatapplication/pdfen_IE
dc.language.isoenen_IE
dc.publisherElsevier ScienceDirecten_IE
dc.relation.ispartofScience Of The Total Environmenten
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Ireland
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/3.0/ie/
dc.subjectTechnetium-99en_IE
dc.subjectIrish Seaen_IE
dc.subjectWestern Irish Sea gyreen_IE
dc.subjectNumerical modelen_IE
dc.subjectDispersionen_IE
dc.subjectStratificationen_IE
dc.subjectFlushingen_IE
dc.subjectBioaccumulationen_IE
dc.subjectCoastal watersen_IE
dc.subjectNorth Channelen_IE
dc.subjectFlow-throughen_IE
dc.subjectCeltic Seaen_IE
dc.subjectRadionuclidesen_IE
dc.subjectDispersionen_IE
dc.subjectModelen_IE
dc.subjectGyreen_IE
dc.subjectSedimentsen_IE
dc.subjectAtlanticen_IE
dc.titleEffects of complex hydrodynamic processes on the horizontal and vertical distribution of Tc-99 in the Irish Seaen_IE
dc.typeArticleen_IE
dc.date.updated2016-05-25T11:55:40Z
dc.identifier.doi10.1016/j.scitotenv.2010.09.017
dc.local.publishedsourcehttp://dx.doi.org/10.1016/j.scitotenv.2010.09.017en_IE
dc.description.peer-reviewedpeer-reviewed
dc.contributor.funder|~|
dc.internal.rssid1335667
dc.local.contactAgnieszka Indiana Olbert, Civil Engineering, Neb Room 2030, Nui Galway. 3208 Email: indiana.olbert@nuigalway.ie
dc.local.copyrightcheckedNo
dc.local.versionACCEPTED
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Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 3.0 Ireland