Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 28 for “"hydrochemistry"”.
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Near-surface hydrology and hydrochemistry under contrasting land-cover
Human transformation of the Earth’s land surface has far-reaching and important consequences for the functioning of hydrological and hydrochemical processes in watersheds. In nowadays land-use change from forest to pasture is a major issue in particular in the tropics. A sustainable management of …
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Groundwater flow, hydrochemistry, and uranium deposition in the Powder River Basin, Wyoming
… relation between regional groundwater flow, hydrochemistry, and uranium distribution in the Powder River Basin indicates that uranium was deposited during the Tertiary Period in groundwater recharge areas where the groundwater changed from a sulfate-bicarbonate water to a bicarbonate-rich …
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Hydrochemistry in an Alpine Karst System, Sequoia and Kings Canyon National Parks, California
This study uses high-resolution, long-term conductivity, temperature, discharge, pH, and laboratory data from 2001 through 2003 from an alpine karst spring located at 2,500 m amsl in Sequoia National Park, California to reveal detailed chemical parameters of this karst system. The data show a …
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Lakes and Groundwater of the Rieti Basin, Central Italy: Hydrochemistry, Paleolimnology, and Seismologic Influences
… samples were recovered and analyzed to study the hydrochemistry and paleolimnology of two lakes in the Rieti Basin and adjacent groundwater springs. Chemical and stable isotopic tracers were used to characterize water samples and to examine downcore changes in sediment cores. The lakes, Lungo and …
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Impacts of Carbonate Mineral Weathering on Hydrochemistry of the Upper Green River Basin, Kentucky
… between the two catchment areas impact hydrochemistry and inorganic carbon cycling. This first required correcting catchment boundaries on previous US Geological Survey Hydrologic Unit Maps to account for areas where the boundaries cross sinkhole plains. Basin boundaries using existing …
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Groundwater Hydrogeolgy and Hydrochemistry of Karst Springs in the Eastern Peninsula of Fort Hood Military Installation
<p>The eastern peninsula of Fort Hood Military Installation is underlain by a complex karst spring network. These springs are a primary water source in a protected habitat for endangered songbirds, which has only recently begun to be fully investigated. These Fredericksburg Group springs express …
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Effects of Acid Deposition and Changing Climate on the Hydrochemistry and Critical Loads of Watersheds in the Adirondack Region of New York
<p>Despite decreases in acidic deposition since the 1970s, the recovery of surface waters from acidification has been limited primarily due to the depletion of exchangeable base cations, net mineralization of organic sulfur and nitrogen and release of previously retained SO42- and NO3-, and …
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Characterizing Hydrological Balance and Hydrochemistry of a Chronosequence of Newly Formed Wetlands within the Athabasca Oil Sands Region using Isotopic and Geochemical Tracers
Wetlands account for approximately 65% of the land area of the oil sands surface mining region, many of which have been lost due to resource extraction. Mined areas are reclaimed using saline-sodic materials present in both surficial geology and residual tailings, affecting wetlands constructed or …
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An assessment of the potential to use water chemistry parameters to define ground water flow pathways at Grand Canyon National Park, Arizona
… for differentiating between waters according to hydrochemistry. The analysis suggests that springs issuing from similar lithologic units and/or geographic localities have analogous chemistry; that local ground water hydrochemistry is similar to south rim springs water chemistry, and particularly …
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Source of saline groundwater in basal Pennsylvanian sandstones, southwestern Illinois: Implications for fluid mixing and water-rock interactions
… is poorly understood. In this study, I combine hydrochemistry, isotope geochemistry, and petrography to evaluate the importance of fluid mixing and water-rock interactions in producing the saline groundwater.
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Sources of CO<sub>2</sub> Controlling the Carbonate Chemistry of the Logsdon River, Mammoth Cave, Kentucky
… which provide major control for the river’s hydrochemistry. Samples were collected from the upstream portion of Logsdon River at what is referred to as the S-188 sump and also nearby at Crowbar Dome over the course of 44 weeks from May 2012 through April 2013. The concentrations of …
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The impact of conifer plantation forestry on the ecology of peatland lakes
… the effect of conifer plantation forestry on the hydrochemistry and ecology of blanket bog lakes in western Ireland. Lake hydrochemistry, littoral Chydoridae (Cladocera) and littoral macroinvertebrate communities were compared among replicate lakes selected from three distinct catchment land use …
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Establishing High-Resolution Hydrogeological, Geochemical and Isotopic Baseline Conditions of the Fresh Water Zone at a Field Research Site Near Brooks, Alberta, Canada
… and stratification in hydrogeology and hydrochemistry. Ports completed in coals had high flow rates and yielded sodium bicarbonate water type, water isotope compositions resembling local meteoric water, elevated methane and ethane concentrations, and biogenic d13C-CH4 values of <-82‰. …
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Assessment of river-groundwater interactions in the Barotse floodplain, Western Zambia.
… Matongo and Senanga) along the Zambezi River. Hydrochemistry was employed to determine the composition of the different water sources and identify the genetic link between the local and regional flow of ground water and interactions with the Zambezi River. In addition, water samples collected …
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A Methodology for Reservoir Site Selection for the Maintenance of Impounded Water Quality
… Blackstrap Reservoir. By defining the geology, hydrochemistry and the surface and ground water hydrology, the interaction between a reservoir and the physical environment may be predicted. This methodology provides a scientific basis for reservoir site selection for the maintenance of water …
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Hydrogeological characterisation and water supply potential of Lebalelo South, Limpopo Province of South Africa
… result of long residence time with dolomite. The hydrochemistry of the water indicates that the chemistry of the groundwater in the area is mainly controlled by rock-water interaction.
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Assessing the contribution and variations of spring discharges to river flows within the Nuwejaars Catchment, Cape Agulhas
… measuring structures, manual flow measurements, hydrochemistry and isotope hydrology to examine the effects of rainfall on spring discharge rates across four experimental spring sites within the Nuwejaars Catchment. Objective 1 of the study was to locate the occurrences of springs and examine …
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An aqueous geochemical and hydrologic study of the springs and wells of the Sevilleta National Wildlife Refuge : evaluating hydrochemical pathways
… models for water quality in the rift using hydrochemistry (major, minor and trace elements, Cl/Br ratios, δ18O, δD, δ13C, and 87Sr/86Sr ratios) and geochemical modeling along a series of transects within the Sevilleta National Wildlife Refuge. In the rift, several potential flow systems can …
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