inscription
Portail d'information géographique

Résultats de la recherche (184 résultats)

Affinez votre recherche

Par Collection Par Auteur Par Date Par Sujet Par Titre
Microstructures in solifluction sediments from South Wales and North Norway
  • Microstructures in solifluction sediments from South Wales and North Norway
  • Elements of the micromorphology of solifluction sediments at two sites in South Wales are described, particularly silt and fine sand cappings which occur on the upper surfaces of the coarse sand and gravel-sized material. These are compared
  • with similar microstructures observed in active solifluction sediments from North Norway.
Microfabric evidence for podzolic soil inversion by solifluction processes
  • Microfabric evidence for podzolic soil inversion by solifluction processes
  • Cold area ; Mass movement ; Meltwater ; Micromorphology ; Microstructure ; Norway ; Periglacial features ; Podsol ; Soil ; Solifluction ; Stratigraphy
  • The inverted stratigraphy of a turf-banked solifluction lobe formed in a podzol in northern Norway is presented. Encircling silt cappings, and related microstructures, are described from thin sections. The presence of these microstructures
  • in the near-surface and base of the solifluction lobe, but not at mid-depths, supports the notion of an inverted stratigraphy.
Morphometry and environmental characteristics of turf-banked solifluction lobes, Kluane Range, Yukon Territory, Canada
  • Morphometry and environmental characteristics of turf-banked solifluction lobes, Kluane Range, Yukon Territory, Canada
  • Canada ; Geomorphometry ; Periglacial features ; Snow ; Soil properties ; Solifluction ; Yukon Territory
  • Measurements of turf-banked solifluction lobes at a site in the Kluane Range, Yukon Territory, are compared to observations made by L.W. Price of similar features located 50 km to the north in the Ruby Range. Both studies show that a threshold depth
  • of snow is necessary for lobes to develop. A cycle of solifluction lobe development is proposed, in which a lobe enlarges to a maximum size that depends on micro-site environmental characteristics.
Snow cover and soil moisture controls on solifluction in an area of seasonal frost, eastern Alps
  • Snow cover and soil moisture controls on solifluction in an area of seasonal frost, eastern Alps
  • Alps (The) ; Austria ; Freezing ; Meltwater ; Mountain ; Seasonal variation ; Slope dynamics ; Snow ; Snow cover ; Soil moisture ; Solifluction
  • This paper presents multi-year measurements of solifluction, frost heave and the concurrent thermal and hydrological regimes at 2 solifluction lobes with seasonal frost in the eastern Alps, Austria. The monitoring system included a new solifluction
Solifluction and translocation processes in bedded periglacial formations. State of the art
  • Solifluction and translocation processes in bedded periglacial formations. State of the art
  • Alps (The) ; Arctic Region ; Cold area ; Creep ; Drainage ; Europe ; Leaching ; Periglacial features ; Quaternary ; Slope deposit ; Solifluction ; Thawing
Soliflukcni proudy a pokryvy na zapadnim svahu Kohoutovické vrchoviny u Brna. (Solifluction forms on the Western slope of the Kohoutovska vrchovina (Highland) near the town of Brno)
  • Soliflukcni proudy a pokryvy na zapadnim svahu Kohoutovické vrchoviny u Brna. (Solifluction forms on the Western slope of the Kohoutovska vrchovina (Highland) near the town of Brno)
  • Two solifluction streams in the investigated area of western slope of the Kohoutovice Highland are described. The landslides, soil creep and every anthropogenous interference requires great care. (MS).
Frontal advance of turf-banked solifluction lobes, Kluane Range, Yukon Territory, Canada
  • Frontal advance of turf-banked solifluction lobes, Kluane Range, Yukon Territory, Canada
  • C 14 dating ; Canada ; Climate reconstruction ; Palaeoclimatology ; Slope ; Slope dynamics ; Solifluction ; Spatial variation ; Stratigraphy ; Yukon Territory
  • Humus horizons associated with 13 solifluction lobes on a single slope were radiocarbon dated at fixed distances behind the risers, as well as ahead of the lobes. The dated horizons, together with stratigraphic observations of planar discontinuities
Movement, moisture and thermal conditions at a turf-banked solifluction lobe, Kluane Range, Yukon Territory, Canada
  • Movement, moisture and thermal conditions at a turf-banked solifluction lobe, Kluane Range, Yukon Territory, Canada
  • Canada ; Climatic change ; Mass movement ; Periglacial features ; Permafrost ; Slope ; Slope dynamics ; Soil moisture ; Soil temperature ; Solifluction ; Yukon Territory
  • The AA. present results from the continuous recording of movement, soil moisture, and ground temperature conditions at a turf-banked solifluction lobe and examine the relationships between these variables. They focus on the influence of soil
Spatial analysis of solifluction landforms and process rates in the Abisko Mountains, Northern Sweden
  • Spatial analysis of solifluction landforms and process rates in the Abisko Mountains, Northern Sweden
  • Cold area ; Model ; Mountain ; Periglacial features ; Regression analysis ; Slope dynamics ; Solifluction ; Spatial analysis ; Sweden
  • The occurrence of turf-banked solifluction landforms in the Abisko region was analysed using a grid-based approach and statistical modelling through logistic regression. Significant parameters in the model were the vegetation index NDVI, annual
  • incoming potential radiation, wetness index, slope gradient and elevation. The model had an acceptable discrimination capacity and rather low model-fit values, but clearly showed the importance of vegetation patterns for the occurrence of solifluction
  • at a regional scale. Solifluction movement rates measured at 8 sites were combined with model parameters and the annual duration of sun hours to regionalise solifluction movement rates through an unsupervised terrain classification. For comparison, the linear
  • relationship between the probability of solifluction occurrence and variations in movement rates was also used to regionalise movement rates.
Alternances du ruissellement et de la solifluction dans les milieux périglaciaires: exemples canadiens et expérimentations
  • Alternances du ruissellement et de la solifluction dans les milieux périglaciaires: exemples canadiens et expérimentations
Field instrumentation for real-time monitoring of periglacial solifluction
  • Field instrumentation for real-time monitoring of periglacial solifluction
  • Arctic Region ; Cold area ; Ground survey ; Instrumentation ; Norway ; Periglacial features ; Research technique ; Slope dynamics ; Solifluction ; Svalbard
  • The AA. describe new field instrumentation recently installed on a non-permafrost solifluction slope in Dovrefjell, Norway, and a continous permafrost solifluction slope in Svalbard. The equipment is designed to provide continuous data on soil
Morphometry and Late Holocene activity of solifluction landforms in the Sierra Nevada, Southern Spain
  • Morphometry and Late Holocene activity of solifluction landforms in the Sierra Nevada, Southern Spain
  • Geomorphometry ; Holocene ; Mountain ; Palaeoclimate ; Sierra Nevada ; Slope dynamics ; Solifluction ; Spain
  • Numerous solifluction landforms in two valleys of the western part of the Sierra Nevada range in the southern Iberian Peninsula were classified according to morphology and used to reconstruct solifluction activity for the Late Holocene. Lobes
  • are almost inactive under the current semiarid climate and water availability appears to be the crucial control on activity within the high-elevation study areas. The presence of numerous inactive solifluction lobes suggests that past climate conditions must
  • have been more favourable for lobe development. Chronostratigraphic profiles of several lobes indicate that colder and/or wetter periods (e.g. the Little Ice Age) tend to promote slope movements, with sparser vegetation cover and higher solifluction
The role of aridification in constraining the elevation range of Holocene solifluction processes and associated landforms in the periglacial belt of the Sierra Nevada (southern Spain)
  • The role of aridification in constraining the elevation range of Holocene solifluction processes and associated landforms in the periglacial belt of the Sierra Nevada (southern Spain)
  • Aridisation ; Climatic variability ; Holocene ; Lacustrine sediment ; Pedogenesis ; Periglacial features ; Quaternary ; Sediment transport ; Sierra Nevada ; Slope dynamics ; Solifluction ; Spain
  • The AA. studied 2 types of sedimentary records that reveal a synchronous timing for slope instability in this high semi-arid massif; solifluction landforms and mountain lake sediments. Lithological and sedimentological properties of both records
  • have recorded numerous cycles of different magnitude of slope processes. Although present-day climate conditions do not promote active solifluction processes in the Sierra Nevada, colder and wetter periods during the Holocene triggered solifluction
  • since 4.2 ka BP that has conditioned solifluction activity to shift gradually to higher elevations.
Jelenkori szoliflukciós folyamatok vizsgálata lösyös térszíneken
  • Debris flow ; Earth surface processes ; Hungary ; Loess ; Slope ; Slope dynamics ; Soil moisture ; Solifluction
  • This research points to the existence of solifluction even under the present climatic conditions. Triggering mechanisms and controlling factors are studied and a typology is developed that shows that solifluction is most frequent on northerly slopes
Solifluction processes in an area of seasonal ground freezing, Dovrefjell, Norway
  • Solifluction processes in an area of seasonal ground freezing, Dovrefjell, Norway
  • Ground freezing ; Mass movement ; Norway ; Slope ; Soil temperature ; Solifluction ; Thawing ; Thermal regime
An experimenttal design for laboratory simulation of periglacial solifluction processes
  • An experimenttal design for laboratory simulation of periglacial solifluction processes
  • Mass movement ; Periglacial features ; Simulation ; Slope ; Slope gradient ; Soil temperature ; Solifluction ; Temperature
Temporal variability of alpine solifluction : a modelling approach.
  • Temporal variability of alpine solifluction : a modelling approach.
  • Alps (The) ; Austria ; Carinthia ; Freezing ; Geomorphology ; Hohe Tauern ; Holocene ; Mountain ; Palaeoclimate ; Precipitation ; Snow ; Solifluction ; Tirol
Centrifuge modelling of solifluction processes : displacement profiles associated with one-sided and two-sided active layer freezing
  • Centrifuge modelling of solifluction processes : displacement profiles associated with one-sided and two-sided active layer freezing
  • Cardiff ; Experimentation ; Freeze-thaw cycle ; Model ; Periglacial features ; Permafrost ; Solifluction ; United Kingdom ; Wales
  • Two sets of small-scale centrifuge experiments were undertaken to simulate solifluction processes associated with one-sided freezing (with no permafrost) and two-sided freezing (with permafrost) with an active layer thick at the prototype scale
Solifluction and mudflow on a limestone periglacial slope in the Swiss Alps : 14 years of monitoring
  • Solifluction and mudflow on a limestone periglacial slope in the Swiss Alps : 14 years of monitoring
  • Alps (The) ; Frost ; Mountain ; Mudflow ; Periglacial features ; Seasonal variation ; Slope dynamics ; Solifluction ; Switzerland
  • This paper summarises the results of long-term observations on a limestone slope subject to deep seasonal frost in the Corviglia area, Upper Engadin. Particular attention is given to highlight 2 types of soil movements (solifluction and mudflow
Rates and processes of periglacial solifluction : an experimental approach
  • Rates and processes of periglacial solifluction : an experimental approach
  • Experimentation ; Freeze-thaw cycle ; Geophysics ; Model ; Periglacial features ; Shear stress ; Slope dynamics ; Slope gradient ; Soil ; Soil moisture ; Soil temperature ; Solifluction
  • Cold room physical modelling of periglacial solifluction processes on an experimental slope of 12° is described, and data on soil temperatures, surface frost heave, thaw consolidation, downslope soil movement and porewater pressures over 7 freeze