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 40 for “"thermal regime"”.
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The Ground thermal regime with special reference to the occurrence of permafrost
This thesis deals with the ground thermal regime and specific reference is made to the occurrence of Permafrost.Consideration is given to the thermal characteristics of soils in that various methods for determining the specific heat and the thermal conductivity of soils are reviewed. The methods …
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Effects of annual thermal regime on growth trajectories of native age-0 brook trout (Salvelinus Fontinalis)
… such changes. Brook trout are considered stenothermal, with a thermal preference of 14°C to 18°C, and a critical thermal maximum of 25°C. With such narrow thermal optima, brook trout are restricted to watersheds with adequate thermal refugia to withstand warm summer temperatures. For …
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Uncovering the Ground Thermal Regime of Coastal Labrador: The Influential Effects of Snow and Vegetation on Ground Temperatures
The ground thermal regime of Arctic and Subarctic regions is impacted by climate and local scale factors. Snow cover has been linked to differences in ground temperatures over short distances (< 5 m) because of its thermal buffering properties which slows energy exchanges between the ground and …
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Eco-hydraulic quantication of hydropeaking and thermopeaking: development of modeling and assessment tools
… regulations, as channelization, as well as flow regime alterations, which often lead to degradation of freshwater ecosystems. In last seven decades a large number of dams have been designed and built worldwide contributing to such river hydromorphological alterations. In alpine and piedmont …
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Tolerating climate change: a study on the influence of thermal history on thermal tolerance of Galaxias zebratus in rivers of the Cape Peninsula, South Africa
… fish, like G. zebratus, may be sensitive to the thermal regime of their environment and may thus be influenced by climate warming. The most commonly used experimental approach for determining the effect of elevated temperature on freshwater biota is the Critical Thermal Method (CTM). The CTM …
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Characterisation of Nitric Oxide Synthase Activity in the Sea Anemone Aiptasia pallida and an Evaluation of Responses to Environmental Stress
… arginine analogues, a nitric oxide donor and a thermal regime that induced bleaching. Contraction of tentacles and body columns was a noted response to each of these exposures; individuals exposed to the most extreme concentrations of chemicals or the highest temperature tested typically …
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Constraining tectonic and climatic controls on glacial/postglacial landscape evolution using numerical modeling
… in climate, tectonics, and surface process regime using numerical landscape evolution modeling. I model the hydrological connection of upland closed depressions to growing channels (via filling and spilling or through shallow subsurface flow) in postglacial low-relief till plains. My models …
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New Insight Into the Thermal-Tectonic History of the Southern Antarctic Peninsula: (U-Th-Sm)/He and Fission-Track Thermochronologic Results From Northwest Palmer Land and Alexander Island
<p>This study examines the thermal history of the southern Antarctic Peninsula through the application of thermochronometry, and presents the first high-resolution thermochronologic dataset for arc rocks of northwest Palmer Land. I present 19 new thermochronologic ages obtained via (U-Th-Sm)/He and …
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Murky waters: discerning among sources of natural variation under high uncertainty and at multiple scales
… regional-scale environmental drivers on flow and thermal regime across three flow-source classes of rivers using dynamic factor analysis. The most probable estimate of allochthony across consumer taxa was 41% in small-montane lakes. For large-montane and alpine lakes, allochthony was just 4 and …
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Geothermal regime of the Williston Basin in North Dakota
<p> Understanding the thermal regime of a large intracontinental basin such as the Williston Basin can be enhanced by analysis of the relationships among radiogenic heat production, surface heat flow, formation temperatures, and gravity and magnetic anomaly patterns. Digital processing of the …
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Radio Echo Sounding Studies of Svalbard Glaciers
… . From these and other data deductions about the thermal regime of the ice masses were made and a geographical trend, linked to the reflection coefficients, observed. The theory of dielectric absorption in ice was discussed with an emphasis on the high frequency, radio echo sounding …
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The Importance of Thermal Habitat Quality for Pumpkinseed (Centrarchidae: Lepomis gibbosus) in Small and Constructed Coastal Embayments Along the Northwest Shoreline of Lake Ontario
… how Lake Ontario (hereafter the Lake) alters the thermal regime of these small coastal embayments, how the altered thermal regimes affect growth and survival of age-0 warmwater fishes, and how the thermal habitat quality for such fishes can be improved by altering embayment design. During the …
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Volatile chemistry, and nitrogen sources and fluxes, in subduction zones : insights from the Izu-Bonin-Mariana Arc
… of the current study is that convergent margin thermal regime is likely the dominant control on the efficiency of nitrogen recycling in subduction zones. A secondary finding from this study, based on correlations between δ15N values and various trace element and radiogenic isotope ratios, is …
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An Investigation of Spatial and Temporal Variability in Several of Montana's Reference Streams: Working Toward a More Holistic Management Strategy
… substantially altered natural stream temperature regimes, impairing these systems’ ability to maintain ecological integrity. Thermal degradation often can be attributed to a variety of human activities, and global climate change, which has been accelerated by the demands of an exponentially …
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An Investigation of Spatial and Temporal Variability in Several of Montana's Reference Streams: Working Toward a More Holistic Management Strategy
… substantially altered natural stream temperature regimes, impairing these systems’ ability to maintain ecological integrity. Thermal degradation often can be attributed to a variety of human activities, and global climate change, which has been accelerated by the demands of an exponentially …
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Potential influences of climate change and tournament angling on lake ecosystems with a focus on largemouth bass
… and location, but lacking the artificially warm thermal regime. I found several differences between the two types of systems, including zooplankton concentration and community composition, fish growth, and fish spawning times. These differences lead me to conclude that regional lakes may change …
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Life history and growth of three populations of Glossosoma nigrior (Trichoptera: Glossosomatidae) from three thermally distinct locations
… were compared to determine how differences in thermal regime might affect their life history as well as the growth of individuals within each population. Two populations were located in Big Stony Creek (Stations 1 and 2) while the third was located in Sinking Creek (Station 3). The thermal …
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Subduction dynamics at the middle America trench : new constraints from swath bathymetry, multichannel seismic data, and 10BE
… load caused by the thick crust and elevated thermal regime in the Cocos plate offshore of southeastern Costa Rica.
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Variational Methods in Ice Sheet Modelling
… geometry in order to assess the sensitivity of thermal conditions at the ice sheet bed to perturbations in unknown parameters. The basal thermal regime is sensitive to changes in geothermal heat flux, with the location of the transition zone between cold and temperate ice being linear sensitive …
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