Publication:
A radioisotope tracer investigation to determine the direction of groundwater movement adjacent to a tidal creek during spring and neap tides

dc.contributor.author Acworth, Richard en_US
dc.contributor.author Hughes, C en_US
dc.contributor.author Turner, Ian en_US
dc.date.accessioned 2021-11-25T14:35:00Z
dc.date.available 2021-11-25T14:35:00Z
dc.date.issued 2007 en_US
dc.description.abstract A radioisotope tracer (Br-82) was injected into a sand aquifer adjacent to a tidal creek at Hat Head, New South Wales, Australia. The injection was timed to coincide with the falling limb of a spring tide in August 2001 and was repeated in July 2002 during a period of neap tides. The tracer movement was detected using gamma logging and fixed gamma detectors in a bore 0.9 m from an injection bore and in a line approximately perpendicular to the creek. Movement of the tracer was detected by comparing measured gamma activity with calibrated activities determined under laboratory conditions. Net movement of the tracer indicated approximately 0.001 m/day laterally towards the creek and 0.07 m/day vertically upward during spring tide conditions. This pattern is reversed during neap tide conditions with little net vertical movement but horizontal movement of 0.15 m/day. The measurements indicated an oscillatory motion coinciding with the tide but lagging the tide by approximately 4.5-6.5 h. The vertical flow during spring tides indicates that vertical movement of the saline interface occurs and results in mixing of different water types beneath the banks of the creek. en_US
dc.identifier.issn 1431-2174 en_US
dc.identifier.uri http://hdl.handle.net/1959.4/42837
dc.language English
dc.language.iso EN en_US
dc.rights CC BY-NC-ND 3.0 en_US
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/3.0/au/ en_US
dc.source Legacy MARC en_US
dc.subject.other coastal aquifers en_US
dc.subject.other radioisotope tracer en_US
dc.subject.other Br-82 en_US
dc.subject.other Australia en_US
dc.subject.other Australia en_US
dc.title A radioisotope tracer investigation to determine the direction of groundwater movement adjacent to a tidal creek during spring and neap tides en_US
dc.type Journal Article en
dcterms.accessRights metadata only access
dspace.entity.type Publication en_US
unsw.accessRights.uri http://purl.org/coar/access_right/c_14cb
unsw.relation.faculty Engineering
unsw.relation.ispartofissue 2 en_US
unsw.relation.ispartofjournal Hydrogeology Journal en_US
unsw.relation.ispartofpagefrompageto 281-296 en_US
unsw.relation.ispartofvolume 15 en_US
unsw.relation.originalPublicationAffiliation Acworth, Richard, Civil & Environmental Engineering, Faculty of Engineering, UNSW en_US
unsw.relation.originalPublicationAffiliation Hughes, C en_US
unsw.relation.originalPublicationAffiliation Turner, Ian, Civil & Environmental Engineering, Faculty of Engineering, UNSW en_US
unsw.relation.school School of Civil and Environmental Engineering *
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