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 17 of 17 for “"Ice velocity"”.
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Theory and numerical modelling of dynamic ice-structure interaction for ice-induced vibrations
… first stage, a dynamic single degree-of-freedom ice-structure interaction model is developed based on a novel physical mechanism combination between self-excited vibration and forced vibration. Van der Pol equation, together with ice stress-strain rate curve and ice-velocity failure length are …
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Ice Action Database for the Confederation Bridge Piers
Ice forces on offshore structures are often the primary design load condition and it is therefore important that they be understood, and can be predicted accurately. During the design of piers of the Confederation Bridge, various design parameters including ice velocity, ice thickness, rubble …
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Patterns and drivers of seasonal land-ice-flow around Antarctica
… the multi-annual acceleration of the Antarctic Ice Sheet, and the associated increase in its contribution to global sea level. Unlike the Greenland Ice Sheet, where ice velocity signals are well resolved over both inter- and intra-annual timescales, observations of seasonal signals are limited …
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An evaluation of sea ice deformation and its spatial characteristics from the regional arctic system model
… the process and frequency of extreme sea ice shear deformation events resulting in pycnocline upwelling due to Ekman pumping as described in McPhee et al. (2005). RASM is a fully coupled land, atmosphere, sea ice, and ocean model with high spatial and temporal resolution. Time series …
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Integration of Higher-Order Physics in the Community Ice Sheet Model: Scientific and Software Concerns
The Community Ice Sheet Model (CISM) is a next-generation land ice model that is designed to answer important questions regarding the response of Earth’s land ice to climate forcing. The program extends Glimmer, an ice sheet model based on the shallow ice approximation. This thesis concerns a …
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Integration of Higher-Order Physics in the Community Ice Sheet Model: Scientific and Software Concerns
The Community Ice Sheet Model (CISM) is a next-generation land ice model that is designed to answer important questions regarding the response of Earth’s land ice to climate forcing. The program extends Glimmer, an ice sheet model based on the shallow ice approximation. This thesis concerns a …
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The Causes and Implications of Microstructures in Glacial Sediments
… its residual strength (20 - 50 kPa) and the ice velocity during lodgement (20 - 50 m a-1). The response of sediment to glacial stress is further examined by triaxial testing of diamict from Yorkshire, and the subsequent examination of its micromorphology. Shears in the material are disrupted …
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Modelling sea ice floe fields
… thesis is concerned with the modelling of sea ice, particularly in regions where it is composed of individual floes interacting through collisions. This has been done by modifying and extending existing models that have demonstrated their ability to simulate sea ice in various Arctic and …
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Tracking retreat processes at the Falljökull Glacier, SE Iceland
In glacial systems, hydrological forcing of ice velocity may lead to instability and accelerated mass loss. However, recent studies have demonstrated that the relationship between ice melt and ice dynamics is non-linear because subglacial drainage configuration strongly modulates meltwater inputs …
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Seasonal and interannual variability in the hydrology and geochemistry of an outlet glacier of the Greenland Ice Sheet
… summer within the ablation zone of the Greenland Ice Sheet (GrIS), meltwater drains to the ice sheet bed through an evolving network of efficient channelized and inefficient distributed drainage systems. Distributed system drainage is a key component in stabilizing GrIS velocity on interannual …
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Glacier Surge Dynamics on Western Axel Heiberg Island, Nunavut
… comprehensive reconstruction of the dynamics of Iceberg and Airdrop glaciers, located on western Axel Heiberg Island, and reveals detailed observations of a surge for the first time in the Canadian Arctic. A variety of remotely sensed data, including historical aerial photographs, declassified …
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Seasonal and interannual variability in the hydrology and geochemistry of an outlet glacier of the Greenland Ice Sheet
… summer within the ablation zone of the Greenland Ice Sheet (GrIS), meltwater drains to the ice sheet bed through an evolving network of efficient channelized and inefficient distributed drainage systems. Distributed system drainage is a key component in stabilizing GrIS velocity on interannual …
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The Response of Antarctic Ice Streams to Tidal Forcing
The majority of the ice flowing from the Antarctic interior makes its way to the ocean through fast-flowing ice streams, or glaciers. Understanding what controls the speed of these streams is extremely important in predicting the overall response of ice sheets to changing climatic conditions, and …
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Computational modelling of ice floe dynamics in the Antarctic marginal ice zone.
The contribution of Antarctic sea ice in global climate models requires a more accurately estimation, as a relatively large part, approximately 4% of the Earth's surface in the winter season, is covered by sea ice. Understanding the dynamic and thermodynamic processes of sea ice, results in a …
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Observing the Seasonal Evolution of Supraglacial Ponds in High Mountain Asia: A Supervised Classification Approach
… the very tentative suggestion that decreasing ice velocity in the central ablation zone may have recently caused compressional ice flow that closes relict englacial conduits, so that they are not available as drainage routes during the Late Monsoon. The findings of this study indicate that …
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Investigations of Ice Photodynamics: Molecular Dynamics Studies and an Apparatus for Solid Sample Velocity Map Imaging
Water ice is prevalent in many environments, from the surface and atmosphere of Earth to molecular clouds in the interstellar medium. High energy photons initiate photoreactions via excitation of water or contaminant species within these environments. This thesis describes increasingly …