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|a Groundwater and sediment analyses of a mangrove swamp near bovoni landfill, St. Thomas, USVI |h [electronic resource]. |
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|a St. Thomas, V.I. : |b University of the Virgin Islands, |c 2015. |
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|a 55 leaves, 12 unnumbered pages : |b color illustrations, maps ; |c 29 cm |
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|a Groundwater hydraulic head and sediment cores were used in an integrated approach to better understand the physical and chemical processes governing a mangrove system in St. Thomas, United States Virgin Islands. Water and sediment sampled from this ecologically important and protected wetland were tested for heavy metals potentially originating from the adjacent Bovoni landfill. Horizontal and vertical groundwater flow directions were determined using hydraulic head data measured in 19 wells from January to November 2014. Sediment cores were used to provide a stratigraphic context and to infer past environmental conditions. Subsamples from these cores were analyzed for dry bulk density, water and organic content through loss on ignition, and select heavy metals using electron microscopy. Horizontal groundwater flow directions, inferred from hydraulic head data, changed seasonally. Groundwater flowed from the island, into the mangrove swamp and toward the ocean during the majority of the study period. Flow reversal occurred after months of little to no precipitation (January to May) with flow from the ocean into the mangrove swamp. Trace metal concentrations of Cr, Ni, Sn, and Zn from 23 to 105 ug/L were measured in water samples. Sediment particles were identified near the landfill containing Bi, Cr, Sn, Ti, and Zn. This study suggests that the mangrove system buffers the outer lagoon by trapping sediments and by delaying water fluxes from the upland to the lagoon. These results are relevant to local managers and to local landfill closure plans." |
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|a Electronic reproduction. |c University of the Virgin Islands, |d 2019. |f (UVI Digital Library) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software. |
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|a University of the Virgin Islands. |
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|a Groundwater -- United States Virgin Islands. Water -- United States Virgin Islands. |
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|a UVI Dissertation/Theses Collection. |
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|a UVI |c UVI Dissertation/Theses Collection |
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|u http://uvi.sobeklibrary.com/AA00000062/00001 |y Click here for full text |
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|a https:/uvi.sobeklibrary.com/content/AA/00/00/00/62/00001/Keller - yesthm.jpg |
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|a UVI Dissertation/Theses Collection |
