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 11 of 11 for “"Diffuse Flow"”.
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Diffuse flow from hydrothermal vents
The effluent from a collection of diffuse hydrothennal vents was modelled to determine the fate of this source of flow under typical environmental conditions at seafloor spreading centers. A laboratory simulation was conducted to test an analytic model of diffuse plume rise. The results showed that …
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Identification of chemoautotrophic microorganisms from a diffuse flow hydrothermal vent at EPR 9° North using 13C DNA Stable Isotope Probing and Catalyzed Activated Reporter Deposition-Fluorescence in situ Hybridization
… supporting the food web at a diffuse flow hydrothermal vent. Both anaerobic and aerobic shipboard incubations containing various augmented electron donor and acceptor species showed that Epsilonproteobacteria were the dominant chemoautotrophs with greater than 70% of the cells …
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Identification of chemoautotrophic microorganisms from a diffuse flow hydrothermal vent at EPR 9° north using ¹³C DNA stable isotope probing and catalyzed activated reporter deposition-fluorescence in situ hybridization
… supporting the food web at a diffuse flow hydrothermal vent. Both anaerobic and aerobic shipboard incubations containing various augmented electron donor and acceptor species showed that Epsilonproteobacteria were the dominant chemoautotrophs with greater than 70% of the cells …
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A Parameterized Approach to Partitioning Between Focused and Diffuse Heat Output and Modeling Hydrothermal Recharge at The East Pacific Rise 9°50´N
… of heat transport between focused and diffuse flow, and (b) the spatial extent and distribution of hydrothermal recharge. These are the main topics of investigation in this thesis. To address these issues, I first use a single-pass modeling approach using a variety of observational data …
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Hydrogeological and Hydrochemical Characterization of the Matozinhos-Pedro Leopoldo Karst, Brazil
… prevented some dye traces. The water that flows through this karst area is almost entirely autogenic, having a small external contribution from some phyllite areas. About 88% of the total water discharge of identified springs drains directly toward Velhas River, the regional base level. The …
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The geochemistry of boron and lithium in mid -ocean ridge hydrothermal vent fluids
… reaction with serpentinites in the down flow zone.</p><p>The results for Li demonstrate that the delta7Li signature of high temperature hydrothermal fluids is remarkably constant with a global average value of 7.5 +/- 1.6‰. This contrasts the variability seen for many other …
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Evaluation of spontaneous potential for monitoring groundwater movement in karst terrain
… streaming potential, effects resulting from the flow of groundwater. In this study SP was monitored at sites in karst terrain in Virginia. The results were evaluated for effectiveness in detecting groundwater flow paths and rates. The ability of SP to distinguish between diffuse flow and conduit …
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Geothermal heat flux from hydrothermal plumes on the Juan de Fuca ridge
… however, other hydrothermal phenomena (e.g., diffuse flow) account for the greater share of the total hydrothermal heat flux.
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Analyzing a 10-Year Cave Drip Record in James Cave, Virginia: Implications for Storage and Recharge in Shallow Appalachian Karst Systems
… However, because springs can integrate multiple flow paths, it is difficult to rely on spring discharge patterns to get information on where and how karst aquifers are receiving recharge. Monitoring closer to the source of recharge through the measurement of cave drips allows for a more accurate …
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Evaluating Preferential Recharge in Blue Ridge Aquifer Systems Using Saline Tracers
… locations on the ground surface to directly test flow pathways in a shallow saprolite and deep fractured rock aquifer. Previous work at the Fractured Rock Research Site have identified an ancient thrust fault complex that is present in the otherwise competent metamorphic bedrock; fracturing along …
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Rare earth element systematics in ancient and modem hydrothermal systems
The geochemical significance of on-axis diffuse fluids, in addition to those formed during the waning phases of hydrothermal systems and off-axis crustal ageing processes, has been investigated through a comparison of the rare earth element (REE) systematics of hydrothermal materials from the …