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dc.contributor.authorItugha, O.D.
dc.contributor.authorChen, D.
dc.contributor.authorGuo, Yakun
dc.date.accessioned2016-09-28T08:32:17Z
dc.date.available2016-09-28T08:32:17Z
dc.date.issued2016-11-05
dc.identifier.citationItugha OD, Chen D and Guo Y (2016) Pollutant advective spreading in beach sand exposed to high-energy tides. Estuarine, Coastal and Shelf Science. 181: 70-82.en_US
dc.identifier.urihttp://hdl.handle.net/10454/9484
dc.descriptionyesen_US
dc.description.abstractThis paper presents field measurements in which dye solute was injected into coastal sand to investigate contaminant advection in intertidal beach sand. The measurements show the pathways of a contaminated plume in the unsaturated zone during both the flood and ebb tides. A prescribed amount of dye tracer solution was directly injected through the topsoil, with average porosity 0.3521±0.01, at predetermined locations of the River Mersey’s outer estuarial beach during ebb-tide. The injected dye was monitored, sampled and photographed over several tidal cycles. The distinctive features of the plume (full two dimensional cross-sections), sediments and water-table depth were sampled in-situ, close to the injection point (differing from previous contaminant monitoring tests in aquifers). The advective movement is attributed to tidal impact which is different from contaminant transport in aquifers. The experimental results show that plumes have significantly large spatial variability, diverging upwards and converging downwards, with a conical geometric shape which is different from the usual spherical/elliptical shape reported in literature. The mean vertical motion of the plume reaches three times the top-width within ten tidal cycles, exceeding the narrow bottom-width by a factor of order 2. The observed transport features of the plume within the beach sand have significant relevance to saltwater intrusion, surface water and groundwater quality. The field observations are unique and can serve as a valuable benchmark database for relevant numerical studies.en_US
dc.description.sponsorshipChina Ministry of Science and Technology 973 program (2014CB745001), Special Program of future development in Shenzhen (201411201645511650) and Shenzhen Key Laboratory for Coastal Ocean Dynamic and Environment(ZDSY20130402163735964).en_US
dc.language.isoenen_US
dc.relation.isreferencedbyhttp://dx.doi.org/10.1016/j.ecss.2016.08.011en_US
dc.rights© 2016 Elsevier. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/en_US
dc.subjectCoastal foreshore; Dye migration; River Mersey Estuary (RME); Interstitial hydraulics: Groundwater table; Intertidal beach sanden_US
dc.titlePollutant advective spreading in beach sand exposed to high-energy tidesen_US
dc.status.refereedYesen_US
dc.date.Accepted2016-08-11
dc.date.application2016-08-13
dc.typeArticleen_US
dc.type.versionAccepted Manuscripten_US
refterms.dateFOA2018-07-19T13:53:15Z


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