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Dissertations / Theses on the topic 'Debris covered glaciers'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Fyffe, Catriona Louise. "The hydrology of debris-covered glaciers." Thesis, University of Dundee, 2012. https://discovery.dundee.ac.uk/en/studentTheses/1ff21418-34ba-4e0a-97ed-69510f3b882c.

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Studies of 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 debris influences the hydrology is poorly understood. This thesis aims to understand the influence of the debris on the hydrological system and water balance of Miage Glacier, Western Italian Alps. The supraglacial hydrology was studied by modelling ablation using a distributed energy balance me

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2

Roehl, Katrin, and n/a. "Terminus disintegration of debris-covered, lake-calving glaciers." University of Otago. Department of Geography, 2006. http://adt.otago.ac.nz./public/adt-NZDU20070502.112854.

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Numerous supraglacial and proglacial lakes have developed on debris-covered glaciers in conjunction with 20th-century retreat associated with global warming. When a glacier holds a substantial debris cover on its lower reach and/or is calving into a proglacial water body, the behaviour of its terminus can be modified to varying degrees compared to that of land-terminating or debris-free glaciers. The terminus is not just retreating from its frontal position but it is disintegrating through several processes that are linked. An improved understanding of these glacier margins is needed for the p

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3

King, Owen. "Characterising the evolution of Himalayan debris covered glaciers." Thesis, University of Leeds, 2018. http://etheses.whiterose.ac.uk/21574/.

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The majority of the 20,000 glaciers found in the Himalaya are in a state of negative mass balance, and have been for decades. Broad spatial trends in ice mass loss have been identified by large scale geodetic mass balance studies, but regional averaging of mass loss data has masked catchment or glacier scale variability. This thesis has the broad aim of examining the catchment scale variability of ice mass loss, in order to identify factors that might promote, or inhibit, more substantial ice mass loss from the region in the future. Ice mass loss rates from Everest region glaciers were calcula

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4

Nicholson, Lindsey. "Modelling melt beneath supraglacial debris : implications for the climatic response of debris-covered glaciers." Thesis, University of St Andrews, 2005. http://hdl.handle.net/10023/10264.

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Understanding how debris-covered glaciers respond to climate is necessary in order to evaluate future water resources and glacier flood hazard potential, and to make sense of the glacier chronology in mountain regions, In order achieve this, it is necessary to improve the current understanding of how surface debris affects glacier ablation rate, and to develop methods by which the ablation of debris-covered glaciers can be predicted under various climatic scenarios. This thesis develops a numerical surface energy balance model that uses simple meteorological data to calculate melt beneath a de

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5

Watson, Cameron Scott. "The evolution of supraglacial ponds and ice cliffs on Himalayan debris-covered glaciers." Thesis, University of Leeds, 2017. http://etheses.whiterose.ac.uk/18964/.

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The widespread negative mass balance of debris-covered glaciers in the central Himalaya is expressed through, and influenced by, glacier surface morphology, including the spatio-temporal dynamics of supraglacial ponds and ice cliffs. These features form a relatively unknown component of the overall melt budget but are thought to be key contributors to a debris-cover anomaly, whereby the insulating effect of debris is offset by enhanced melt at supraglacial ponds and ice cliffs. In this thesis we revealed the role of ice cliff evolution and supraglacial pond dynamics at seasonal to annual times

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6

Miles, Evan. "Spatio-temporal variability and energy-balance implications of surface ponds on Himalayan debris-covered glaciers." Thesis, University of Cambridge, 2016. https://www.repository.cam.ac.uk/handle/1810/263026.

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Surface ponds play a key role in transferring atmospheric energy to the ice for debris-covered glaciers, but as the spatial and temporal distribution of ponds is not well documented, their effect on glacier ablation is unknown. This thesis uses remote sensing and field methods to assess the distribution of supraglacial ponds in the Langtang Valley of Nepal, then develops and applies numerical models of pond surface energy balance to determine energy receipts at the pond, glacier, and basin scales. 172 Landsat TM/ETM+ scenes are analysed to identify thawed supraglacial ponds for the debris-cove

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7

Foster, Lesley A. "Utilisation of remote sensing for the study of debris-covered glaciers : development and testing of techniques on Miage Glacier, Italian Alps." Thesis, University of Dundee, 2010. https://discovery.dundee.ac.uk/en/studentTheses/06d96169-df3b-49f0-b26c-f8f1ccc58e8d.

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An increase in the number of debris-covered glaciers and expansion of debris cover across many glaciers has been documented in many of the world’s major glacierised mountain ranges over the last 100 years. Debris cover has a profound impact on glacier mass balance with thick layers insulating the underlying ice and dramatically reducing ablation, while thin or patchy cover accelerates ablation through albedo reduction. Few debris-covered glaciers have been studied in comparison with ‘clean’ glaciers and their response to climatic change is uncertain. Remote sensing, integrated with field data,

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8

Hands, Kathryn Ann. "Downwasting and supraglacial lake evolution on the debris-covered Ngozumpa Glacier, Khumbu Himal, Nepal." Thesis, University of St Andrews, 2004. http://hdl.handle.net/10023/7128.

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In recent decades, the downwasting of several debris-covered glaciers in the Himalaya has led to the formation of large and potentially hazardous moraine- dammed lakes. The frequency of Glacial Lake Outburst Flood (GLOF) events in the Himalaya has steadily increased since the 1970s and as global temperatures continue to rise this trend is set to continue in the future. Downwasting of the debris-covered Ngozumpa Glacier in the Khumbu Himal, Nepal, has resulted in the abandonment of the lateral and terminal moraine crests, leaving them standing several tens of metres above the glacier surface. T

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9

Wiseman, Seonaid Ann. "The inception and evolution of supra-glacial lakes on debris-covered glaciers in the Nepal Himalaya." Thesis, University of Aberdeen, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.429466.

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In the Himalaya, ablation of debris-mantled valley glaciers has resulted in the formation of large, potentially unstable moraine-dammed lakes. In recent decades several Glacier Lake Outburst Floods (GLOFs) have occurred, which have resulted in destruction of land and infrastructure for several tens of kilometres down valley. As a result, the growth of supra-glacial lakes is considered to be a potential hazard to human lives and livelihoods. Therefore, there is a need for better understanding of the factors involved in lake emergence and subsequent evolution, in order to prepare for and allevia

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10

Brun, Fanny. "Influence de la couverture détritique sur le bilan de masse des glaciers des Hautes Montagnes d’Asie : une approche multi-échelle." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAU024/document.

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Les Hautes Montagnes d’Asie (HMA) abritent la plus grande superficie de glaciers en dehors des régions polaires. Environ 15 % des ~100 000 km² de glaciers des HMA sont couverts de débris d’épaisseur variable. L’influence de cette couverture détritique sur la réponse des glaciers au changement climatique reste méconnue. Au-delà d’une épaisseur critique (quelques cm), les débris protègent les glaciers de la fonte par effet isolant. Mais ces glaciers présentent des structures qui pourraient sensiblement accentuer leur fonte : en surface ce sont les falaises où la glace est à nue et les lacs supra

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11

Lorrey, Andrew M. "Distribution of Patterned Ground and Surficial Deposits on a Debris-covered Glacier Surface in Mullins Valley and Upper Beacon Valley, Antarctica." Fogler Library, University of Maine, 2002. http://www.library.umaine.edu/theses/pdf/LorreyAM2002.pdf.

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12

Gibson, Morgan. "The role of supraglacial debris in Himalaya-Karakoram debris-covered glacier systems." Thesis, Aberystwyth University, 2017. http://hdl.handle.net/2160/da25722d-928c-47d5-8f38-877a22768786.

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Spatiotemporal variability in supraglacial debris properties have the potential to affect estimations of mass balance for debris-covered glaciers. This thesis is concerned with identifying the extent to which debris properties vary in space and time, and the role of these variabilities in estimations of specific mass balance. The research presented uses a combination of methods, including statistical analysis of field data, mapping and classification of thermal and optical remotely sensed data, and numerical modelling. Near-surface debris temperature was measured in the field to investigate sh

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13

Minora, U. F. "Applicazione di tecniche remote sensing per lo studio dell'evoluzione e della dinamica criosferica in aree remote e di alta quota." Doctoral thesis, Università degli Studi di Milano, 2016. http://hdl.handle.net/2434/363344.

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I ghiacciai sono efficaci indicatori climatici poichè si modificano in risposta ai cambi del clima (es. temperatura e precipitazioni). L'attenzione sui ghiacciai di montagna sta aumentando tra la comunità scientifica per via del loro sempre più evidente arretramento a scala globale negli ultimi cinquant'anni. Ciò è conseguenza del riscaldamento globale. Comprendere il comportamento dei ghiacciai in risposta al cambio climatico è di enorme importanza non solo per arricchire la conoscenza scientifica, ma anche per poter meglio gestire in futuro le situazioni di rischio naturale che possono colpi

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14

Reznichenko, Natalya. "Rock Avalanches on Glaciers: Processes and Implications." Thesis, University of Canterbury. Geological Sciences, 2012. http://hdl.handle.net/10092/6524.

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This thesis examines the role of rock avalanches in tectonically active terrains including the effects of the deposits on glacier behaviour and their contribution to moraine formation. The chronologies of mountain glacier fluctuations, based on moraine ages, are widely used to infer regional climate change and are often correlated globally. In actively uplifting mountain ranges rock avalanches that travel onto the ablation zone of a glacier can reduce ice-surface melting by insulating the ice. This can cause buried ice to thicken due to slower ablation and can signiﬁcantly alter the overall gl

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15

Tampucci, D. "Glacial and periglacial landforms as warm-stage refugia for cold-adapted plant and arthropod species:ecological and biogeographical significance of a habitat system." Doctoral thesis, Università degli Studi di Milano, 2016. http://hdl.handle.net/2434/438244.

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Since 1880 air temperature at global scale rapidly increased of c. 0.85 °C likely due to the increasing amount of anthropogenic greenhouse gas, and is forecast to increase over the 21st century as well. Cold-adapted species of the high latitude/altitude are the first to be threatened by such climate change, due to the progressive reduction of their suitable areas. Microclimatic heterogeneity at landscape level is supposed to play a key role in this scenario providing warm-stage refugia, sites able to preserve suitable climate conditions for cold-adapted species in spite of the ongoing climate

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16

Mackay, Sean Leland. "Age, origin and evolution of Antarctic debris-covered glaciers: implications for landscape evolution and long-term climate change." Thesis, 2016. https://hdl.handle.net/2144/14508.

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Antarctic debris-covered glaciers are potential archives of long-term climate change. However, the geomorphic response of these systems to climate forcing is not well understood. To address this concern, I conducted a series of field-based and numerical modeling studies in the McMurdo Dry Valleys of Antarctica (MDV), with a focus on Mullins and Friedman glaciers. I used data and results from geophysical surveys, ice-core collection and analysis, geomorphic mapping, micro-meteorological stations, and numerical-process models to (1) determine the precise origin and distribution of englacial and

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