. The longitudinal stresses play a significant role in determining glacier dynamics on length scales up to at least 2 km and that predictive power of models of glacierflow based purely on the driving stress approximation is therefore subject to significant
With the purpose of improving the ice physics underpinning time-dependent glacier flowline models, 3 independent approaches for solving longitudinal stresses in glaciers are discussed and verified by application to Haut Glacier d'Arolla
Présentation des données sur les vitesses d'écoulement de 3 glaciers rocheux actifs (Reichenkar, Ölgrube, et Kaiserberg) dans les Alpes autrichiennes. Discussion sur leur origine et leur mécanisme d'écoulement.
Ice flow vectors on the debris-mantled Tasman Glacier, 1957-1986
Glacial ablation ; Glacial flow ; Glacier ; Glaciology ; New Zealand ; Photogrammetry ; Shear stress ; South Island ; Thermokarst
Ablation glaciaire ; Contrainte de cisaillement ; Ecoulement glaciaire ; Glacier ; Glaciologie ; Nouvelle-Zélande ; Photogrammétrie ; South Island ; Thermokarst
This paper examines the debris-mantled zone of Tasman Glacier for evidence of debris mantle formation. Particularly, the velocity distribution and surface morphology are studied to understand the extent and rate of ice stagnation and the process
This second part of a review deals with the mechanisms of rock glacier formation and flow. The AA. first discuss terminological and classification problems associated with rock glaciers and dynamic nature of rock glaciers. The third part concludes
this series of papers by discussing the role and significance of rock glaciers in mountain geomorphology, glaciology and environmental reconstructions.
The intent of this work is to : 1) present surface velocities on 15 rock glaciers averaged over 12 years (1983-1995) in the Selwyn Mountains; 2) calculate long-term velocities using rock glacier length and lichen age; 3) compare the velocities
Climatic change ; Colorado ; Creep ; Glacier ; Mountain ; Permafrost ; Rock glacier ; United States of America
of flow. Rates of flow have remained consistent and suggest that rock glaciers in the Front Range are adjusted to the current climate, unlike some rock glaciers in the European Alps. The rock glaciers, however are not in a permanent steady state
During the 1960s, several surveying networks were established on rock glaciers located in the Front Range of the Colorado Rocky Mountains. During, the summer of 2002, the A. re-established surveying networks, and obtained a 40-plus year record
), the position of the terminus has moved over time with reduced variations compared to the dimensions of the overall glacier. The Liligo is a small and transversal glacier, already flowing into the Baltoro glacier, and it is characterised by phases of great
Variations that took place at the terminus of some Karakorum glaciers (particularly the Baltoro Glacier and the Liligo Glacier) during the 20th century have been reconstructed using several methodologies. The two glaciers studied have shown
different behaviour at the termini, at least regarding the rate of variations. The Baltoro is one of the longest glaciers on the Earth : though characterized by phases of expansion (1913-1929, 1954-1987, 1990-1997) and of contraction (1929-1954, 1987-1990
Rock glacier dynamics in a marginal periglacial high mountain environment : flow, movement (1991-2000) and structure of the Argualas rock glacier, the Pyrenees
Creep ; Geophysics ; Mountain ; Periglacial features ; Pyrénées ; Rock glacier ; Sedimentology ; Spain ; Years 1990-99
This paper presents the results of detailed studies on the dynamics of the Argualas rock glacier in the Pyrenees from 1991 to 2000. The aim is to provide a better understanding of the surface movement and dynamics of the tongue-shaped rock glacier
This paper provides a review and a synthesis of the work done between 1981 and 1995: detailed studies of surface velocity, glacier hydrology and ice dynamics. Small glaciers, such as Storglaciären, are not as sluggish as may be expected but exhibit
Mountain glaciers at the end of the twentieth century : global analysis in relation to climate and water cycle
Climatic cycle ; Climatic variability ; Glacier ; Glacierflow ; Glacier mass balance ; Marine transgression ; Mountain ; Water cycle ; World
Bilan de masse ; Cycle climatique ; Cycle de l'eau ; Glacier ; Monde ; Montagne ; Régime glaciaire ; Transgression marine ; Variabilité climatique
Mesures de bilan de matière et incertitudes sur ces mesures. Superficie des glaciers et son évolution. Régime glaciaire. Configuration spatiale des changements de vomume des glaciers. Bilan de matière des glaciers et variabilité climatique. Bilan de
matière des glaciers et élévation du niveau des mers. Deux appendices.
Arctic Region ; Cold area ; Glacial surge ; Glacier ; Glacier dynamics ; Moraine ; Polar region ; Sedimentology ; Svalbard
The aim of this study is to identify ice-flow instability, e.g., surge-related events, for a retreating glacier with unknown surge record. The AA. compare the landform assemblage from the foreground of Elisebreen with hypothesized geomorphological
criteria derived from observations of surging glaciers elsewhere and find that ice-flow instability can be inferred when geomorphological criteria are combined with sedimentological data.
The AA. characterize the seasonal variation in the geochemical and isotopic content of the outflow of the Green Lake 5 rock glacier (RG5), located in the Green Lakes Valley of the Colorado Front Range. They focus on the 2003 season from
the initiation of snow melt to the start of the next snow accumulation season. They then use that information to identify flow sources and pathways using quantitative, multi-component mixing models.
Photogrammetric analysis of Front Range rock glacierflow rates
Colorado ; Dynamique glaciaire ; Etats-Unis ; Glacier rocheux ; Modèle numérique de terrain ; Montagne ; Photogrammétrie ; Réchauffement climatique ; Système d'information géographique ; Température de l'air
Air temperature ; Climatic warming ; Colorado ; Digital elevation model ; Geographical information system ; Glacier dynamics ; Mountain ; Photogrammetry ; Rock glacier ; United States of America
Horizontal rock glacier displacements were measured by tracking large surficial rocks on temporal orthophotos from 1978, 1990, and 1999. Vertical change was measured by creating digital elevation models (DEMs) from digital stereopairs
, then substracting elevations to detect change. Because horizontal and vertical change is minimal, Front Range rock glaciers appear to be adjusted with current climate.
Recent glacier changes in the Wind River Range, Wyoming
Fluctuations of glaciers ; Geophysics ; Glacierflow ; Glaciers ; Glaciology ; Mountain ; United States ; Wyoming
Ecoulement glaciaire ; Etats-Unis ; Fluctuation du glacier ; Glacier ; Glaciologie ; Géophysique ; Montagne ; Retrait glaciaire ; Wind River Range ; Wyoming
The purpose of this study is to determine the water equivalent lost and the water equivalent remaining in storage for Dinwoody Glacier in the Wind River Range. Parallax measurements on matching aerial photograph stereopairs from 1958 and 1983 were
used to calculate the ice lost from Dinwoody Glacier.
The A. presents the results of a study of the short-period motion of two glaciers on Mt Wrangell, Alaska. These glaciers are located on an active volcano and have a common accumulation zone. The study documents distinctive differences in their short
A glacial interpretation for the origin and formation of the Marinet Rock Glacier, Alpes Maritimes, France
Special issue : the geomorphic and climatic significance of rock glaciers
Alpes du Sud ; Alps (The) ; France ; Geophysics ; Glacial features ; Glacial flow ; Glacier ; Model ; Moraine ; Permafrost ; Photogrammetry ; Rock glacier
Alpes ; Alpes du Sud ; Ecoulement glaciaire ; France ; Glaciaire ; Glacier ; Glacier rocheux ; Géophysique ; Modèle ; Moraine ; Pergélisol ; Photogrammétrie
Rock glaciers of the Southern French Alps, specifically the Marinet Rock Glacier, are commonly thought to have apermafrost origin. However, results from ground surveys, relationships between debris and ice input, lichen dating and historical
Digital terrain modelling of the surface and bed topography of the glacier Austre Okstindbreen, Okstindan, Norway
Climatic variation ; Glacial flow ; Glacier ; Glacier fluctuation ; Glacier mass balance ; Model ; Norway ; Numerical model ; Remote sensing ; Subarctic zone ; Topography
Bilan de masse ; Ecoulement glaciaire ; Fluctuation du glacier ; Glacier ; Modèle ; Modèle numérique ; Norvège ; Topographie ; Télédétection ; Variation climatique ; Zone subarctique
Close to the Artic Circle, all the glaciers of Svartisen, the largest ice-covered area of northern Scandinavia, have retreated since the beginning of the century. However, several of the smaller glaciers which end at relatively high altitude have
experienced both periods of advance and periods of retreat since the mid-1960s. Studies of glacier change are aided by the use of digital terrain models (DTMs). Triangular irregular network DTMs of the surface and bed topography of the glacier Austre
Okstindbreen, have been used in studies of mass balance variations and changing surface flow patterns between 1976 and 1995.
Based on a review of observations on different types of calving glaciers, a simple calving model is proposed. Advance or retreat of the calving front is not driven by changes in the calving rate, but by flow-induced changes in the geometry
Glacier physics of the Puget lobe, southwest cordilleran ice sheet
C14 dating ; Glacial features ; Glacial flow;Glacierflow ; Glacier ; Glacier mass balance ; Ice sheet;Ice cap;Inlandsis ; Palaeogeography ; United States ; Washington State
Bilan de masse ; Datation C 14 ; Ecoulement glaciaire ; Etats-Unis ; Glaciaire ; Glacier ; Inlandsis ; Paléogéographie ; Washington State