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 “"Frozen soils"”.
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Measurement and Simulation of Preferential Flow in Frozen Soils
The infiltrability of frozen soils strongly influences the partitioning of snowmelt and hydrological functioning of cold regions. Preferential flow in macropores may enhance infiltration into frozen soil, but flow dynamics are complicated by coupled water and heat transfer processes. Field studies …
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Electromagnetic, thermal, hydraulic and mechanical characterization of frozen soils having different initial thermal and hydraulic properties
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-05-01
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An Improved Water-Driven Sediment Yield Model for Cold Agricultural Regions
… consideration of snow redistribution and melt, frozen soils, and ponding over grainfields and grasslands with well-developed soils. Soil erosion models typically target temperate climate hillslope-scale processes driven by rainfall-runoff during the growing season and fail to capture the critical …
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Uplift capacity of helical piles in thawing permafrost
… 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 processes in …
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Stress-tolerant bioremediation strategy for cold-climate sites: laboratory, modelling, and field studies for extending petroleum hydrocarbon biodegradation to seasonally freezing and frozen contaminated soil phases
… of petroleum hydrocarbon-contaminated soils in cold climates is challenging due to low temperatures, limited field accessibility, and low microbial activity. Conventional bioremediation practices have focused on short summers in cold climates, but the feasibility of extending …
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Hydrological regime changes in a Canadian Prairie wetland basin
… 20th C observations show that snowmelt over frozen soils accounted for over 80% of the annual runoff, and streamflow hydrographs peaked in April and ceased in May due to a lack of runoff or groundwater contributions. Since then, the region has undergone rapid changes in land use and climate, …
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Experimental investigation of soil volume changes during freezing and thawing
… the thermal-hydro-mechanical behaviour of soils 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. …
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Physical mechanisms controlling the pre-failure stress-strain behavior of frozen sand
… the pre-failure stress-strain behavior of frozen sands are investigated in triaxial compression. The pre-failure, or small strain behavior (Ea<l%), is represented by the initial stiffness (Young's modulus) and the upper yield stress, a very distinctive yield point representing the onset of …
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Novel disturbance regimes in the Arctic: paleoecological perspectives on fire and thermo-erosion from Alaskan tundra
… the release of large carbon stocks stored in frozen soils. Fires can directly release soil carbon through combustion, and catastrophic thermo-erosion can rapidly increase the carbon pool available for microbial decomposition. On longer timescales, fires can enhance permafrost thaw by reducing …
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Soil organic matter dynamics in a temperate forest influenced by extreme weather events
… °C and –13 °C. After a two-week freezing period, frozen soils were thawed at +5 °C and irrigated with 80 mm water at a rate of 4 mm per day. After the third cycle, SOM pools of the treatments were compared with those of non-dried control columns. Under field conditions from late December 2005 …
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Carbon and nitrogen mineralization in temperate forest soils at low temperatures
… nitrogen (N) mineralization in temperate forest soils was often considered negligible at low temperatures during the dormant season, which is questioned by recent findings. Climate models predict warmer winters but little is known about the temperature sensitivity of C and N mineralization at low …