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 232 for “"Glaciers"”.
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Radio Echo Studies of Glaciers
… is a need for measurements of the thickness of glaciers, ice sheets, and ice shelves. Radio waves propagating in naturally occurring ice masses are attenuated by absorption in the conducting medium, by reflection from discontinuities, and by scattering from inhomogeneities. These scattering …
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The hydrology of debris-covered glaciers
… glacier-hydrology have focused on clean Alpine glaciers, and recently ice sheet outlet glaciers, but there are few studies on debris-covered glaciers. It is known debris affects ablation rates, and that debris-covered glaciers evolve differently to their debris-free counterparts, but how the …
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Remote Sensing Studies of Svalbard Glaciers
… its melting point was tested over a number of glaciers in Spitsbergen. Ice thickness data were obtained from 38 glaciers. The results are compared with previous geophysical investigations of ice thickness on Spitsbergen, revealing problems concerning existing Soviet radio echo sounding data …
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The Mass balance modelling of Spitzbergen glaciers
… of mass balance studies carried out on two glaciers in north-west Spitsbergen, Midre Lovenbreen and Austre Broggerbreen, using an energy balance model. A general description of glaciers, including their classification and the manner in which their surfaces may be sub-divided, is carried out. …
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Investigation of Surge-Type Glaciers in Svalbard
… factors affecting the distribution of surge-type glaciers and the causes of the surge mechanism are not fully understood. Statistical analyses of glaciers in Svalbard have been used to identify characteristics which are related to surging. Field experiments were undertaken on Bjuvbreen, a small …
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Radio Echo Sounding Studies of Svalbard Glaciers
… the radio echo sounding properties of Svalbard glaciers and to use these data to obtain information about the glaciological environment. Particular emphasis was placed on obtaining an understanding of the dielectric properties of the ice and reflecting boundaries present. These were then used to …
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Meltwater temperature in streams draining from Alpine glaciers
… In meltwater streams draining from Alpine glaciers, temperatures measured close to glacier termini show strong diurnal variation and paradoxical seasonal variation, being cool when energy availability is greatest. This thesis aims to describe temporal variations of water temperatures in …
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Remote Detection of Surging Glaciers Across High Mountain Asia
… for this purpose. Terminus positions of surging glaciers identified in this study using satellite imagery were delimited using Google Earth Engine Digitisation Tool (GEEDiT). Subsequently, using terminus change profiles, a 6-part classification scheme was developed to characterise surge …
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Disconnection of outlet glaciers and vulnerability of Harding Icefield, Southcentral Alaska
… identified (61 total and 63 partial) across 26 glaciers, with most occurring between 2009 and 2018, and concentrated on the eastern side of the icefield. Disconnected glaciers lost an average of 28.8% of their 1986 area, substantially more than glaciers without disconnection. Statistical …
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Characteristics of lateral-frontal moraine formed at Arctic and Alpine glaciers
… 21st centuries has stimulated the recession of glaciers world-wide. Moraines developed by valley glaciers provide a sedimentary record of their past response to climatic forcing. Despite the use of moraines for understanding the character and behaviour of former glaciers, our understanding of …
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Snowmelt Detection on Alpine Glaciers using Synthetic Aperture Radar Time Series
<p>Hindu Kush Himalayan (HKH) glaciers serve as some of the most sensitive indicators of changes in global climate. These glaciers shape the hydrologic dynamics of river systems supplying freshwater to over 2 billion people throughout Asia and regulate the geochemistry of sensitive aquatic alpine …
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Changes in surging outlet glaciers of the Langjökull Ice Cap, Iceland
This study investigated the surging Hagafellsjökull outlets of the Langjökull ice cap, Iceland. It utilises digital elevation models from 1986, 1997, 2004 and 2007 in order to assess topographic change. These changes are linked to the surging outlets in terms of alteration of the subglacial …
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Numerical Modelling of Sediment Delivery from Tidewater Glaciers to the Marine Environment
… to simulate marine sedimentation from tidewater glaciers for the dominant transport processes of icebergrafting and glacial meltwater plumes. Icebergs calved from tidewater glaciers contain sediment, which is released as the icebergs melt. The SedBerg Model utilises Monte Carlo based techniques …
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Flow Characteristics, Setting, and Basal Boundary Condition of North Greenland Outlet Glaciers
… contribution to sea level rise from tidewater glaciers is also spatially variable across the ice sheet, and observations reveal their contrasting behaviour at a regional scale. Whilst ice-ocean interaction may explain their dynamics in the south of Greenland, the warm subtropical waters …
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Prediction under uncertainty : from models for marine-terminating glaciers to Bayesian computation
The polar ice sheets have enormous potential impact on future global mean sea level rise. Recent observations suggest they are losing mass to the ocean at an accelerated rate. Skillful prediction of the ice sheets' future mass loss remains difficult, however; observations of key variables are …
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Glaciers as a secondary source of anthropogenic contaminants: An emerging socio-environmental challenge
Glaciers provide vital ecosystem services, including water resources, habitat provision, and food and energy security. Once considered pristine, glaciers are now known to accumulate various contaminants, including fallout radionuclides (FRNs) and potentially toxic elements (PTEs), which can pose …
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INVENTORY OF MONGOLIAN GLACIERS FOR THE GLOBAL LAND ICE MEASUREMENTS FROM SPACE (GLIMS) PROGRAM
Glaciers in the Altai Mountains of Mongolia provide an estimated 10 % of the total water resources within the country. Yet, the number and area of glaciers within the Altai Mountains is inconsistent and conflicting. Glacier mapping attempts by previous author groups did not mention their mapping …
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INVENTORY OF MONGOLIAN GLACIERS FOR THE GLOBAL LAND ICE MEASUREMENTS FROM SPACE (GLIMS) PROGRAM
Glaciers in the Altai Mountains of Mongolia provide an estimated 10 % of the total water resources within the country. Yet, the number and area of glaciers within the Altai Mountains is inconsistent and conflicting. Glacier mapping attempts by previous author groups did not mention their mapping …
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Reconstructing Loch Lomond Stadial Glaciers and Climate in the south-west English Lake District
… into warm-based geomorphologically active outlet glaciers in the valleys. Further Loch Lomond Stadial sites have also been identified in the Lake District by Wilson (2002: 2004) and Wilson and Clark (1998: 1999). The geomorphology of the south-west Lake District is identified and presented here …
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