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Articles 1 - 4 of 4
Full-Text Articles in Physical Sciences and Mathematics
Chemical Evolution And Residence Time Of Groundwater In The Wilcox Aquifer Of The Northern Gulf Coastal Plain, Estifanos Haile
Chemical Evolution And Residence Time Of Groundwater In The Wilcox Aquifer Of The Northern Gulf Coastal Plain, Estifanos Haile
Theses and Dissertations--Earth and Environmental Sciences
This study aims to integrate groundwater geochemistry and mathematical modeling to determine the dominant geochemical processes and groundwater residence time within the Wilcox aquifer in the northern Gulf Coastal Plain. Groundwater samples were collected and analyzed for major ion chemistry, stable isotopes (18O, 2H, and 13C), and radioisotope 36Cl content. Geochemical modeling enabled the identification of major sources and sinks of solutes in the aquifer. A two-dimensional, finite-difference, numerical model was used to determine the deep groundwater flow rate and transport of 36Cl in the aquifer. Major ion chemistry shows a chromatographic pattern along …
Bedrock Geology And Tectonic Evolution Of The Western Central Maine Zone, South Central Massachusetts, Thomas Bradley Walker
Bedrock Geology And Tectonic Evolution Of The Western Central Maine Zone, South Central Massachusetts, Thomas Bradley Walker
Theses and Dissertations--Earth and Environmental Sciences
Bedrock geology of the East Brookfield quadrangle (EBQ), based on new 1:24000 scale mapping, consists of an interfolded sequence of Rangeley Fm. and Paxton Fm. metasediments, intruded by Early Mississippian tonalitic to granitic orthogneisses and underlain in the western half by folded orthogneisses of unknown age. Pervasive flattening strains have created planar, generally NNE-SSW striking and consistent moderately west dipping foliations. Generally strike-parallel stretching lineations and boudinage structures, with rarer dip parallel stretching lineations, reflect extrusion of CMZ metasediments and orthogneisses with a flattening component. Mapping in the EBQ demonstrates that a transition between deformational mechanisms of the southern Central …
Arsenic Heterogeneity In Aquifer Sediments From West Bengal, India, Emily Eastridge
Arsenic Heterogeneity In Aquifer Sediments From West Bengal, India, Emily Eastridge
Theses and Dissertations--Earth and Environmental Sciences
Multiple studies in the Bengal basin have shown that elevated As in groundwater coincides with reduced, relatively dark sediments of Himalayan provenance. In West Bengal state (India), As concentrations > 10 μg/L tend to occur east of the River Bhagirathi-Hoogly, the main distributary of the Ganges. Associations among sediment chemistry and mineralogy for four cores from either side of the Bhagirathi-Hoogly (cores 1 and 2 to the east, 3 and 4 to the west) in Murshidabad district were investigated. Ten sediment samples were collected from each boring at various depths to a maximum of 38 to 43 m. Sediment chemistry was …
Locating Hot Spots Of Fecal Pollution In An Urban Watershed Of Central Kentucky Using Bacteroides 16s Rrna Markers, Tricia L. Coakley
Locating Hot Spots Of Fecal Pollution In An Urban Watershed Of Central Kentucky Using Bacteroides 16s Rrna Markers, Tricia L. Coakley
Theses and Dissertations--Earth and Environmental Sciences
The field of molecular fecal source tracking in the water environment has developed rapidly since the first PCR assays for general and host-‐specific Bacteroides 16s rRNA markers were published. Numerous host-‐specific molecular markers and PCR assays have been developed, adding greater specificity, sensitivity and quantitative methods to the array of options. The public demand for readying methods for transfer to the commercial lab, so that they may be used to generate data for public utilities, citizen action groups and regulatory agencies, has fueled the development of an entire new research community. These methods, however plentiful, have not found community agreement …