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 8 of 8 for “"Ground Ice"”.
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Investigations of the Martian Mid-Latitudes: Implications for Ground Ice
… Martian surface processes relating to water or ice using a combination of geomorphology and modeling. I first examine sublimation of ice from new small mid-latitude craters with freshly exposed ice imaged by the High Resolution Imaging Science Experiment (HiRISE) camera. I discuss the theory of …
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Hydrological and Hydrochemical Responses From Thawing Permafrost in the Canadian Arctic
… During exceptionally warm and wet summers, deep ground thaw enhances the infiltration and storage of rainfall and has the potential to solubilize inorganic ions previously stored at depth in the transient layer. Subsequent mid to late- summer rainfalls act as a hydrological flushing mechanism, …
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A Framework for Evaluating Thaw Settlement in Permafrost Regions
… stability in cold regions, leading to ground subsidence, structural instability, and increased maintenance costs. Accurate thaw settlement prediction is essential for mitigating these effects and ensuring infrastructure resilience. This thesis presents a Thaw Settlement Evaluation …
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Landscape history and contemporary environmental drivers of microbial community structure and function
… melting of ephemeral snow packs and hillslope ground ice. Using T-RFLP 16S rRNA gene profiles of microbial communities, I analyzed the contribution of till and environmental factors to community similarity, and assessed the functional potential of the microbial community using extracellular …
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Studies of Glacial and Periglacial Environments on Mars
… was to determine the distribution and origins of ice-related landforms in the northern plains, and provide insight as to whether these landforms are related to distinct geological or geomorphological units. To accomplish this, I used the grid mapping approach to explore a large tract covering the …
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The Water Cycle at the Phoenix Landing Site, Mars
… is covered for part of the year by the seasonal ice cap, a layer of CO2 and H2O ice that is deposited in mid-fall and sublimates in mid-spring. During the mid-summer, H2O ice is deposited on the surface at the Phoenix landing site. CO2 ice forms at the site during fall. The onset date of seasonal …
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Novel disturbance regimes in the Arctic: paleoecological perspectives on fire and thermo-erosion from Alaskan tundra
… such as wildfire and thermo-erosion (i.e., ground subsidence transport of ice-rich sediments) have increased in frequency and magnitude in tundra ecoregions in recent decades. These novel disturbance regimes could increase the role of the Arctic in exacerbating climate warming through the …
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Experimental investigation of soil volume changes during freezing and thawing
… with focus on frost heave and thaw settlement. Ground freezing is a natural phenomenon that affects civil engineering projects, especially in cold regions or where artificial ground freezing (AGF) is employed. Freezing causes water in the soil pores to turn into ice, which expands, leading to …