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dc.contributor.authorTakesue, Renee K.  Concept link
dc.contributor.authorBothner, Michael H.  Concept link
dc.contributor.authorReynolds, Richard L.  Concept link
dc.date.accessioned2009-12-14T14:47:26Z
dc.date.available2009-12-14T14:47:26Z
dc.date.issued2009-09-24
dc.identifier.citationEstuarine, Coastal and Shelf Science 85 (2009): 459-471en_US
dc.identifier.urihttps://hdl.handle.net/1912/3091
dc.descriptionThis paper is not subject to U.S. copyright. The definitive version was published in Estuarine, Coastal and Shelf Science 85 (2009): 459-471, doi:10.1016/j.ecss.2009.09.014.en_US
dc.description.abstractGeochemical tracers, including Ba, Co, Th, 7Be, 137Cs and 210Pb, and magnetic properties were used to characterize terrestrial runoff collected in nearshore time-series sediment traps in Hanalei Bay, Kauai, during flood and dry conditions in summer 2006, and to fingerprint possible runoff sources in the lower watershed. In combination, the tracers indicate that runoff during a flood in August could have come from cultivated taro fields bordering the lower reach of the river. Land-based runoff associated with summer floods may have a greater impact on coral reef communities in Hanalei Bay than in winter because sediment persists for several months. During dry periods, sediment carried by the Hanalei River appears to have been mobilized primarily by undercutting of low 7Be, low 137Cs riverbanks composed of soil weathered from tholeiitic basalt with low Ba and Co concentrations. Following a moderate rainfall event in September, high 7Be sediment carried by the Hanalei River was probably mobilized by overland flow in the upper watershed. Ba-desorption in low-salinity coastal water limited its use to a qualitative runoff tracer in nearshore sediment. 210Pb had limited usefulness as a terrestrial tracer in the nearshore due to a large dissolved oceanic source and scavenging onto resuspended bottom sediment. 210Pb-scavenging does, however, illustrate the role resuspension could play in the accumulation of particle-reactive contaminants in nearshore sediment. Co and 137Cs were not affected by desorption or geochemical scavenging and showed the greatest potential as quantitative sediment provenance indicators in material collected in nearshore sediment traps.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherElsevier B.V.en_US
dc.relation.urihttps://doi.org/10.1016/j.ecss.2009.09.014
dc.subjectSediment trapsen_US
dc.subjectProvenanceen_US
dc.subjectTrace elementsen_US
dc.subjectRadioisotopesen_US
dc.subjectMagnetic propertiesen_US
dc.subjectCoral reefsen_US
dc.titleSources of land-derived runoff to a coral reef-fringed embayment identified using geochemical tracers in nearshore sediment trapsen_US
dc.typeArticleen_US
dc.identifier.doi10.1016/j.ecss.2009.09.014


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