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  • 1
    Online-Ressource
    Online-Ressource
    Newark :John Wiley & Sons, Incorporated,
    Schlagwort(e): Glaciology -- Fieldwork. ; Electronic books.
    Materialart: Online-Ressource
    Seiten: 1 online resource (414 pages)
    Ausgabe: 1st ed.
    ISBN: 9780470015162
    DDC: 551.31/072/3
    Sprache: Englisch
    Anmerkung: Intro -- Field Techniques in Glaciology and Glacial Geomorphology -- Contents -- Preface -- Acknowledgements -- 1 Introduction -- 1.1 Aim -- 1.2 The scope of this book -- 1.3 Book format and content -- 1.4 The role of fieldwork in glaciology and glacial geomorphology -- 1.5 The relationship between field glaciology and glaciological theory -- 2 Planning and conducting glaciological fieldwork -- 2.1 Aim -- 2.2 Designing and planning field-based research -- 2.3 Logistical preparations for fieldwork -- 2.4 Fieldwork data -- 3 Glacier ice: Character, sampling and analysis -- 3.1 Aim -- 3.2 Ice masses and ice facies: Principles, definition and identification -- 3.3 Sampling glacier ice -- 3.4 Ice analysis -- 3.5 Student projects -- 4 Glacier meltwater: Character, sampling and analysis -- 4.1 Aim -- 4.2 Background -- 4.3 Measuring bulk meltwater discharge: Stage-discharge rating curves -- 4.4 Sampling and analysing glacial meltwaters -- 4.5 Automated measurements by sensors and loggers -- 4.6 Tracer investigations -- 4.7 Student projects -- 5 Hot-water borehole drilling and borehole instrumentation -- 5.1 Aim -- 5.2 Introduction -- 5.3 Hot-water drilling -- 5.4 Borehole instrumentation -- 5.5 Summary -- 5.6 Student projects -- 6 Ice radar -- 6.1 Aim -- 6.2 Background and physical principles -- 6.3 Ice radar equipment -- 6.4 Radar data presentation -- 6.5 Field radar surveys -- 6.6 Processing -- 6.7 Field application and interpretation of ice radar -- 6.8 Student projects -- 7 Glacier mass balance and motion -- 7.1 Aim -- 7.2 Surface energy budget -- 7.3 Mass balance -- 7.4 Glacier motion and ice velocity -- 7.5 Student projects -- 8 Glacigenic sediments -- 8.1 Aim -- 8.2 Introduction to field sedimentology -- 8.3 Colour and organic content -- 8.4 Sediment texture -- 8.5 Particle morphology: The shape and roundness of sedimentary particles. , 8.6 Bedding -- 8.7 Sedimentary structures -- 8.8 Palaeocurrent data -- 8.9 Other properties -- 8.10 Field sampling techniques -- 8.11 Fabric analysis: General considerations -- 8.12 Clast macrofabrics -- 8.13 Clast microfabrics and microstructural description -- 8.14 Clast mesofabrics -- 8.15 Laboratory analysis -- 8.16 Interpreting the environment of deposition of sediments -- 8.17 Presentation of sedimentological data -- 8.18 Student projects -- 9 Mapping glaciers and glacial landforms -- 9.1 Aim -- 9.2 General considerations -- 9.3 Aims of the mapping and the areal extent of the map -- 9.4 Desk-based studies -- 9.5 Remotely sensed data -- 9.6 Geomorphological mapping -- 9.7 Field mapping -- 9.8 Field surveying techniques -- 9.9 Ground-penetrating radar and shallow seismic reflection investigations of sediment bodies -- 9.10 Electrical resistivity surveys -- 9.11 Aquatic (marine and lacustrine) geophysical techniques -- 9.12 Mapping glacier structures (structural glaciology) -- 9.13 Final map compilation -- 9.14 Mapping and measurement of landforms change over time -- 9.15 Student projects -- 10 Monitoring and reconstructing glacier fluctuations -- 10.1 Aim -- 10.2 Remotely sensed images -- 10.3 Fieldwork mapping and historical documents -- 10.4 Dating glacier fluctuations using 'absolute age' (numerical-age) and 'relative age' estimates -- 10.5 Numerical-age dating techniques -- 10.6 Relative-age dating techniques -- 10.7 Dating glacier fluctuations - concluding remarks -- 10.8 Student projects -- References -- Index.
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  • 2
    Online-Ressource
    Online-Ressource
    Newark :John Wiley & Sons, Incorporated,
    Schlagwort(e): Glacial landforms.;Glaciers. ; Electronic books.
    Materialart: Online-Ressource
    Seiten: 1 online resource (401 pages)
    Ausgabe: 2nd ed.
    ISBN: 9780470745441
    DDC: 551.31
    Sprache: Englisch
    Anmerkung: Intro -- Glacial Geology -- Contents -- Preface -- Acknowledgements -- Illustrations -- Chapter 1: Introduction -- 1.1 What is Glacial Geology and Why is it Important? -- 1.2 The Aim and Structure of this Book -- Chapter 2: Glaciations Around The Globe -- 2.1 The Antarctic Ice Sheet -- 2.2 Greenland in the Greenhouse -- 2.3 Southern Hemisphere Temperate Glaciers: Patagonia and New Zealand -- 2.4 Northern Hemisphere Temperate Glaciers: Alaska and Iceland -- 2.5 High-Altitude Glaciers: The Himalaya -- 2.6 Tropical Glaciers: The Cordillera Blanca, Peru -- 2.7 Arctic Polythermal Glaciers -- 2.8 Summary -- Suggested Reading -- Chapter 3: Mass Balance and the Mechanisms of Ice Flow -- 3.1 Annual Mass Balance -- 3.2 The Mass Balance Gradient: The Glacial Driving Mechanism -- 3.3 Mechanisms of Ice Flow -- 3.4 The Principles of Basal Thermal Regime -- 3.5 Patterns and Rates of Ice Flow -- 3.6 Glacier Response to Climate Change -- 3.7 Summary -- Suggested Reading -- Chapter 4: Glacier Hydrology -- 4.1 Glacier Hydrology -- 4.2 Sources of Glacial Meltwater -- 4.3 Storage of Water in Glaciers -- 4.4 Methods of Studying Glacier Hydrology -- 4.5 Glacier Hydrological Systems -- 4.6 Subglacial Water Pressure -- 4.7 Discharge Fluctuations -- 4.8 Glacial Meltwater Erosion -- 4.9 Summary -- Suggested Reading -- Chapter 5: The Processes of Glacial Erosion -- 5.1 Glacial Abrasion -- 5.2 Glacial Quarrying -- 5.3 Estimating Rates of Glacial Erosion -- 5.4 Patterns of Glacial Erosion -- 5.5 Summary -- Suggested Reading -- Chapter 6: Landforms of Glacial Erosion -- 6.1 Microscale Features of Glacial Erosion -- 6.2 Mesoscale Features of Glacial Erosion -- 6.3 Macroscale Features of Glacial Erosion -- 6.4 Landscapes of Glacial Erosion -- 6.5 Summary -- Suggested Reading -- Chapter 7: Glacial Debris Entrainment and Transport -- 7.1 High-Level Debris Transport. , 7.2 Debris Entrainment -- 7.3 Low-Level Debris Transport -- 7.4 Debris Transfer Between Low and High Levels -- 7.5 Debris Transfer -- 7.6 Summary -- Suggested Reading -- Chapter 8: Glacial Sedimentation on Land -- 8.1 Direct Glacial Sedimentation -- 8.2 Fluvial Sedimentation -- 8.3 Summary -- Suggested Reading -- Chapter 9: Landforms of Glacial Deposition on Land -- 9.1 Ice-Marginal Moraines -- 9.2 Subglacial Landforms Formed by Ice or Sediment Flow -- 9.3 Glaciofluvial Ice-Marginal Landforms -- 9.4 Glaciofluvial Subglacial Landforms -- 9.5 Summary -- Suggested Reading -- Chapter 10: Glacial Sedimentation in Water -- 10.1 Sedimentation in Lacustrine Environments -- 10.2 Sedimentation in Marine Environments -- 10.3 Distinguishing Glaciolacustrine and Glaciomarine Diamicts from Glacial Tills -- 10.4 Summary -- Suggested Reading -- Chapter 11: Landforms of Glacial Deposition in Water -- 11.1 Glaciolacustrine Landforms -- 11.2 Glaciomarine Landforms -- 11.3 Summary -- Suggested Reading -- Chapter 12: Palaeoglaciology -- 12.1 The Methods Used in Palaeoglaciology -- 12.2 The Key Landforms Used in Palaeoglaciology -- 12.3 Former Subglacial Thermal Regimes -- 12.4 Palaeoglaciological Reconstructions -- 12.5 Summary -- Suggested Reading -- Index.
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  • 3
    Online-Ressource
    Online-Ressource
    Newark :John Wiley & Sons, Incorporated,
    Schlagwort(e): Glacial landforms -- Congresses. ; Electronic books.
    Materialart: Online-Ressource
    Seiten: 1 online resource (436 pages)
    Ausgabe: 1st ed.
    ISBN: 9781444304442
    Serie: International Association of Sedimentologists Series ; v.23
    DDC: 551.31/5
    Sprache: Englisch
    Anmerkung: Intro -- Preface -- Foreword -- Introduction to Papers -- Part 1 Glacier dynamics and sedimentation -- Hydrological connections between Antarctic subglacial lakes, the flow of water beneath the East Antarctic Ice Sheet and implications for sedimentary processes -- Sedimentology, structural characteristics and morphology of a Neoglacial high-Arctic moraine-mound complex: Midre Lovenbreen, Svalbard -- A new laboratory apparatus for investigating clast ploughing -- Part 2 Modelling glaciers and ice sheets -- A coupled ice-sheet/ice-shelf/sediment model applied to a marine-margin flowline: forced and unforced variations -- A brief review on modelling sediment erosion, transport and deposition by former large ice sheets -- Part 3 Quaternary glacial systems -- Glaciomarine sediment drifts from Gerlache Strait, Antarctic Peninsula -- Sedimentary signatures of the Waterloo Moraine, Ontario, Canada -- Estimating episodic permafrost development in northern Germany during the Pleistocene -- Lake-level control on ice-margin subaqueous fans, glacial Lake Rinteln, Northwest Germany -- Seasonal controls on deposition of Late Devensian Glaciolacustrine Sediments, Central Ireland -- Anatomy and facies association of a drumlin in Co. Down, Northern Ireland, from seismic and electrical resistivity surveys -- The Newbigging esker system, Lanarkshire, Southern Scotland: a model for composite tunnel, subaqueous fan and supraglacial esker sedimentation -- The age and origin of the Blakeney esker of north Norfolk: implications for the glaciology of the southern North Sea Basin -- Sediments and landforms in an upland glaciated-valley landsystem: upper Ennerdale, English Lake District -- Part 4 Pre-Quaternary glacial systems -- Cenozoic climate and sea level history from glacimarine strata off the Victoria Land coast, Cape Roberts Project, Antarctica. , Glacial stress field orientation reconstructed through micromorphology and m X-ray computed tomography of till -- The Late Ordovician glacial sedimentary system of the North Gondwana platform -- The Ordovician glaciation in Eritrea and Ethiopia, NE Africa -- Neoproterozoic glaciated basins: a critical review of the Snowball Earth hypothesis by comparison with Phanerozoic glaciations -- Index.
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  • 4
    Buch
    Buch
    Chichester [u.a.] : John Wiley
    Schlagwort(e): Glacial landforms ; Glaciers ; Glacial landforms ; Glaciers ; Lehrbuch ; Glazialgeologie ; Glazialgeologie ; Glaziallandschaft ; Gletscher ; Glazialgeologie ; Glaziallandschaft ; Gletscher
    Materialart: Buch
    Seiten: X, 364 S , Ill., graph. Darst., Kt , 25 cm
    ISBN: 0471963445 , 0471963453
    DDC: 551.3/1
    RVK:
    RVK:
    RVK:
    Sprache: Englisch
    Anmerkung: Includes bibliographical references and index , Includes bibliographical references and index
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  • 5
    facet.materialart.
    Unbekannt
    PANGAEA
    In:  Supplement to: Irvine-Fynn, Tristram D L; Porter, P R; Rowan, Ann V; Quincey, Duncan J; Gibson, Morgan J; Bridge, J W; Watson, C Scott; Hubbard, Alun L; Glasser, Neil F (2017): Supraglacial ponds regulate runoff from Himalayan debris-covered glaciers. Geophysical Research Letters, 44(23), 11894-11904, https://doi.org/10.1002/2017GL075398
    Publikationsdatum: 2024-02-24
    Beschreibung: A hydrological monitoring station for Khumbu Glacier, Nepal, was established in a stable reach of the sole outflow channel at 4930 m a.s.l.. at approximately 27°56'02"N 86°48'44"E where meltwater breaches the lateral/terminal moraine ridge. Average water stage (S) was recorded at 30 min intervals using a Druck PDCR1730 pressure transducer and Campbell Scientific (CS) CR1000 data logger. Stage is given as DN. To derive discharge (Q), a stage-discharge rating curve was developed using 18 dilution experiments of 10% fluorescein and a Turner Designs Cyclops7 fluorometer linked to a CS CR10X datalogger. Rating curve observations covered the lowermost 50% of stage values recorded, and uncertainty in Q is estimated at 10-15%. The non-linear exponential stage-discharge relationship was given as: Q = 0.2839.e^(5.55397.S). Discharge is in m^3/s. Data extends from 14th May (DOY134) to 13th November (DOY317), and time is given as decimal-day format (DOY135.5 = 12:00 midday on DOY135).
    Schlagwort(e): DATE/TIME; Day of the year; KhumbuGlacier_outflow; Nepal; RGS; River discharge; River gauging station; Sensor reading
    Materialart: Dataset
    Format: text/tab-separated-values, 26313 data points
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  • 6
    ISSN: 1751-8369
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geographie , Geologie und Paläontologie
    Notizen: Well-rounded gravels are described from moraine-mound complexes, diamicton forefields and modern englacial thrusts at the margins of four glaciers on the northern side of Brøggerhalvøya, northwest Spitsbergen. Their shape charcteristics are compared with modern and fossil glacigenic, modern beach and Early Weichselian beach gravels from this peninsula. The best discriminators of the well-rounded gravels have been found to be the percentage-frequency roundness histograms, the roundness mid-point and roundness range diagrams and the sphericity-roundness plots. It is concluded that the gravels have been derived by englacial thrusting from Early Weichselian or last interglacial beaches in the inner parts of the fjord and in the low level cirques when sea level reached at least 50m a.s.l. and deposited the beach gravels. The discrimination between gravel in basal diamictons, proglacial outwash and modern beaches is difficult as the reworking has resulted in little particle shape change. The potential major problem caused by reworking in the glacial environment is emphasised. especially when clast shape comparisons from modern environments to older sediments are used.
    Materialart: Digitale Medien
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  • 7
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Polar research 17 (1998), S. 0 
    ISSN: 1751-8369
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geographie , Geologie und Paläontologie
    Notizen: Fridtjovbreen is an actively surging tidewater glacier in western Spitsbergen, Svalbard. This paper presents observations made at the western flank of the glacier in July 1997, when the glacier front was still advancing rapidly and was characterised by steep lateral ice cliffs. The geomorphological consequences of the surge include the formation of push moraines from toppled ice blocks along this ice cliff and the development of debris-rich thrusts. There is also evidence of glaciotectonic deformation within deformed debris-rich thrusts. Thrusts are restricted to the lateral margins and are not seen in the terminal calving cliff. On its western flank, Fridtjovbreen is over-riding Sagabreen, a small-tributary glacier. Large facies variations in this area are a result of recycling by Fridtjovbreen of material originally transported as medial moraines on Sagabreen. There are few observations of landform development at actively surging glaciers in Svalbard. The Fridtjovbreen descriptions provide documentation for post-surge landform development. More observations are required at the margins of actively surging glaciers to determine how representative Fridtjovbreen is of a surge event.
    Materialart: Digitale Medien
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  • 8
    ISSN: 1751-8369
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geographie , Geologie und Paläontologie
    Notizen: The existence of a large subglacial lake beneath the antarctic Ice Sheet at Terre Adélie indicates the presence of basal ice at its pressure-melting temperature. A numerical model of the ice-sheet thermal regime is employed using the balance velocity of the ice sheet as an initial model input in order to calculate ice-sheet basal temperatures. However, the results from this model show the Terre Adélie area to be characterised by basal freezing. Heat in addition to that accounted for in the model is thus required at the ice-sheet base in order for pressure melting temperatures to be attained. The sources for such heat are (1) an enhanced geothermal heat flux and (2) an increase in frictional heating caused by the flow of ice. In this paper the latter possibility is expanded by hypothesising that subglacial topography induces convergent ice flow around Terre Adélie, causing enhanced basal ice velocities. Model experiments indicate that an increase in ice velocity (from 7 to at least 42 m yr−1) is required to raise the temperature of the basal ice to the pressure melting value. Increased ice velocity, and consequent frictional heat production due to convergent ice flow, may therefore be important in explaining the location of the subglacial lake in this region. These results allow the process of convergent ice flow within a contemporary ice sheet to be quantified. A verification (or otherwise) of the model results may be possible if ice surface velocity measurements from modem GPS methods are made.
    Materialart: Digitale Medien
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  • 9
    Digitale Medien
    Digitale Medien
    Oxford UK : Blackwell Science Ltd
    Sedimentology 49 (2002), S. 0 
    ISSN: 1365-3091
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: This paper focuses on the structural glaciology, dynamics, debris transport paths and sedimentology of the forefield of Soler Glacier, a temperate outlet glacier of the North Patagonian Icefield in southern Chile. The glacier is fed by an icefall from the icefield and by snow and ice avalanches from surrounding mountain slopes. The dominant structures in the glacier are ogives, crevasses and crevasse traces. Thrusts and recumbent folds are developed where the glacier encounters a reverse slope, elevating basal and englacial material to the ice surface. Other debris sources for the glacier include avalanche and rockfall material, some of which is ingested in marginal crevasses. Debris incorporated in the ice and on its surface controls both the distribution of sedimentary facies on the forefield and moraine ridge morphology. Lithofacies in moraine ridges on the glacier forefield include large isolated boulders, diamictons, gravel, sand and fine-grained facies. In relative abundance terms, the dominant lithofacies and their interpretation are sandy boulder gravel (ice-marginal), sandy gravel (glaciofluvial), angular gravel (supraglacial) and diamicton (basal glacial). Proglacial water bodies are currently developing between the receding glacier and its frontal and lateral moraines. The presence of folded sand and laminites in moraine ridges in front of the glacier suggests that, during a previous advance, Soler Glacier over-rode a former proglacial lake, reworking lacustrine deposits. Post-depositional modification of the landform/sediment assemblage includes melting of the ice-core beneath the sediment cover, redistribution of finer material across the proglacial area by aeolian processes and fluvial reworking. Overall, the preservation potential of this landform/sediment assemblage is high on the centennial to millennial timescale.
    Materialart: Digitale Medien
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  • 10
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Polar research 21 (2002), S. 0 
    ISSN: 1751-8369
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geographie , Geologie und Paläontologie
    Notizen: This paper outlines the results of stable isotope (δD-δ18O) analysis of snow and glacier ice undertaken as part of a larger study concerning structural glaciology, debris entrainment and debris transport patterns at Midtre Lovénbreen, Svalbard. Samples of fresh snow were collected from the glacier surface in spring 1999 and samples of surface glacier ice and basal ice samples were collected in summer 1999. When plotted on bivariate co-isotopic diagrams (δD-δ18O), the slopes obtained for snow and unmodified glacier ice (6.4 and 6.9, respectively) are less steep than those for the basal ice layer and transverse ice layers on the ice surface (7.6 and 7.7, respectively). The difference in the slope of these lines is not statistically significant at the sample size (50) used in this study. The results indicate that although stable isotope analysis clearly has potential for studies of debris entrainment, transport and structural glaciology, difficulties remain with applying this technique. It is therefore not possible to apply these isotopic techniques to ice facies of unknown origins. In particular, large sample numbers are required to establish statistical differences and high-resolution sampling of specific ice facies may be necessary to establish isotopic differences.
    Materialart: Digitale Medien
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