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 135 for “"permafrost"”.
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The permafrost problem
Thesis (B.S.)--Michigan State College of Agriculture and Applied Science, 1948
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The modification of arctic permafrost coastlines
… between terrestrial systems dominated by permafrost and marine systems dominated by sea ice. An increased rise in sea level and degradation of sea-ice as predicted by the Intergovernmental Panel on Climate Change in its most recent report and as observed recently in the Arctic will likely …
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Uplift capacity of helical piles in thawing permafrost
… capacity of helical piles embedded in silty permafrost soils. The overall of goals of this thesis are (1) characterization of the impact of different environmental and loading conditions on the axial capacity of helical piles and (2) development of meaningful relationships on the physical …
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A Framework for Evaluating Thaw Settlement in Permafrost Regions
Permafrost degradation due to climate change threatens infrastructure 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 …
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Remote sensing of recent changes in permafrost-influenced wetlands
… and by ground characteristics such as coincident permafrost and surficial geology. As the Arctic continues to warm, a continued observation of thermokarst lake evolution over both broad landscapes and localised regions will be increasingly valuable to future studies that investigate the resulting …
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Thermokarst and thermal erosion : degradation of Siberian ice-rich permafrost
… rest of the world. This has profound effects on permafrost that underlies most of the arctic land area. Permafrost thawing can lead to the liberation of considerable amounts of greenhouse gases as well as to significant changes in the geomorphology, hydrology, and ecology of the corresponding …
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The seasonal dynamics of Arctic surface hydrology in permafrost environments
… cal cycling. In the Arctic and sub-Arctic permafrost zones, rising air temperatures are warming, and in some regions even thawing, the frozen ground. Permafrost is a carbon sink. The thermal state of the ground therefore has important implications on carbon exchange with the atmo- sphere. …
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Controls on terrestrial carbon and nutrient cycling in Arctic permafrost environments
High latitude regions are being disproportionately affected by changes induced by climate warming. The direction of global environmental change will largely depend on the response of Arctic ecosystems to positive and negative feedbacks, which has implications for the global climate system and the …
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Hydrological and Hydrochemical Responses From Thawing Permafrost in the Canadian Arctic
… in watersheds impacted by thermal and physical permafrost disturbances, (3) which key factors control permafrost chemistry and runoff solute loads, and (4) where in the Canadian Arctic are changes to surface water chemistry expected to be the most pronounced with continued climate warming. …
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Under the Permafrost: Uncovering a Social Movement in the Soviet Union
Despite the wealth of information on the advent of environmentalism on the Soviet Union less is known about the social aspect of its development. This thesis examines the social aspect of environmentalism through a look at public responses to massive degradation. The instances of intense ecological …
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Runoff from hummock-covered Arctic tundra hillslopes in the continuous permafrost zone
Runoff processes at three hummock-covered hillslopes within a 95 ha catchment (Siksik Creek) in the tundra region of the Canadian western Arctic were studied for three years (1992-1994). Measurements over the study included all hydrological inputs, monitoring of active layer and water table depths, …
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Subarctic ecosystem responses to climate, catchment and permafrost dynamics in the Holocene
… assesses aspects of the wetland development, permafrost dynamics and associated changes in carbon and nutrient cycling of the Stordalen Mire in northern Sweden. Various ecological and biogeochemical analyses of one peat and two lake sediment sequences were conducted, including analyses of …
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The Ground thermal regime with special reference to the occurrence of permafrost
… 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 presented for determing these soil characteristics …
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Forced and Unforced Permafrost Changes in the Northern Hemisphere during 1901-2100
<p>Permafrost regions are very sensitive to rapid changes in climate and environment. In recent decades, there has been growing interest to better understand the permafrost degradation over the Northern Hemisphere in the context of human-induced climate change. Understanding permafrost dynamics is …
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Effect of mass wasting on soil organic carbon storage and coastal erosion in permafrost environments
Accelerated permafrost thaw under the warming Arctic climate can have a significant impact on Arctic landscapes. Areas underlain by permafrost store high amounts of soil organic carbon (SOC). Permafrost disturbances may contribute to increased release of carbon dioxide and methane to the …
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USE OF CELLULAR CONCRETE FOR AIR CONVECTION EMBANKMENT TO PROTECT PERMAFROST FOUNDATION IN COLD REGIONS
… distresses caused by climatic extremes in permafrost regions for over three decades. However, the desired crushed rocks needed for ACE are not readily available in many areas of interior Alaska. Burdened by the need to ship suitable rocks to remote locations, the cost of constructing an ACE …
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