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Résultats de la recherche (43 résultats)

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  • Piping causing thermokarst in permafrost, Ungava Peninsula, Quebec, Canada
  • Canada ; Cold area ; Drainage ; Gully erosion ; Ice wedge ; Meltwater ; Periglacial features ; Permafrost ; Quebec ; Runoff ; Thermokarst ; Ungava
  • The aim of this short note is to describe an observation of rather unusual piping in an ice wedge from the continuous permafrost region in northernmost Quebec (mean annual temperature about -6°C). The hydrology of permafrost and its importance
  • 1997
  • Cold area ; Fjord ; Geomorphogenesis ; Greenland ; Groundwater ; Periglacial features ; Permafrost ; Pingo
  • Open system, or more correctly, hydraulic pingos, are genetically poorly understood. A continuing problem concerns their need for a perennial groundwater supply (intra- or sub-permafrost). This has to be maintained despite the existence
  • of continuous permafrost in many areas where they are located. Recent work on Disko Iland has suggested a new type of hydraulic pingo developing only in a marsh environment. It is argued that the marsh setting is not relevant to the formation of these features
  • 1997
  • Permafrost changes in the northern Tien Shan during the Holocene
  • Cryoturbation ; Holocene ; Kazakhstan ; Mountain ; Palaeogeomorphology ; Periglacial features ; Permafrost ; Soil temperature ; Sounding ; Thermal anomaly ; Tien Shan
  • 1997
  • Numerical simulation of permafrost evolution as a part of sedimentary basin modeling : permafrost in the Pliocene-Holocene climate history of the Urengoy field in the West Siberian basin
  • Asian part of Russia ; Glacial features ; Model ; Numerical model ; Palaeo-environment ; Palaeoclimate ; Permafrost ; Pliocene ; Quaternary ; Soil temperature ; West Siberia
  • 1997
  • Canada ; Climatic variation ; Climatic warming ; Global change ; Holocene ; Isotope analysis ; Northwest Territories ; Palaeo-ecology ; Palynology ; Peat bog ; Permafrost ; Pollen diagram ; Quaternary ; Stratigraphy
  • This paper presents a reconstruction of the ecological and hydrological history of a peatland in an area of continuous permafrost near Tuktoyaktuk. It is an attempt to understand to what degree peatland development may have been affected by climate
  • , in order to gauge the sensitivity of peatlands in permafrost regions to future climate warming.
  • 1997
  • Antarctica ; Geophysics ; Glacial features ; Glacier ; Ground ice ; Palaeo-environment ; Periglacial features ; Permafrost ; Rock glacier ; Sea level
  • All periglacial and glacial landforms investigated in the Northern Foothills have a very thin active layer overlying a thin permafrost layer, characterised by electrical resistivities and by different thicknesses. Below this surficial layer
  • , different types of ground ice were detected. These different types of ground ice permitted ice-cored rock glaciers to be distinguished from ice-cemented rock glaciers, subsea permafrost to be identified in some raised beaches, and other interpretations
  • 1997
  • The chronology of speleothem deposition in northern Yukon and its relationships to permafrost
  • Canada ; Cave ; Cave development ; Concretion ; Palaeo-environment ; Palaeomagnetism ; Permafrost ; Pleistocene ; Pollen analysis ; Quaternary ; Th/U dating ; Yukon
  • 1997
  • Paleomagnetism of Canadian Arctic permafrost; Quaternary magnetostratigraphy of the Mackenzie delta
  • Canada ; Geochronology ; Northwest Territories ; Oil exploration ; Palaeomagnetism ; Periglacial features ; Permafrost ; Quaternary ; Stratigraphy
  • 1997
  • Climatic variation ; Climatic warming ; Cold area ; Periglacial features ; Permafrost ; Russia
  • Depuis le milieu des années 60 on note dans le nord de la Russie une hausse générale de la température de l'air. Le réchauffement des horizons supérieurs de la zone de permafrost, observé au cours des 15-20 dernières années, est lié, dans certains
  • modifications fondamentales de la température et de la morphologie dans la zone de permafrost.
  • 1997
  • Distribution of mountain permafrost, Fontanesses Basin, Valaisian Alps, Switzerland
  • Active layer ; Alps (The) ; Climatic variation ; Geophysics ; Mountain ; Periglacial features ; Permafrost ; Rock glacier ; Snow ; Spatial variation ; Switzerland ; Temperature ; Valais
  • 1997
  • A neural network method to determine the presence or absence of permafrost near Mayo, Yukon Territory, Canada
  • Canada ; Forecast ; LANDSAT ; Model ; Periglacial features ; Permafrost ; Remote sensing ; Thematic Mapper ; Yukon Territory
  • 1997
  • Monitoring of mountain permafrost in the central Andes, Cordon del Plata, Mendoza, Argentina
  • Andes ; Argentina ; Cryoturbation ; High mountain ; Moraine ; Mountain ; Periglacial features ; Permafrost ; Rock glacier ; Solifluction ; Thermokarst
  • 1997
  • Analysing the creep of mountain permafrost using high precision aerial photogrammetry : 25 years of monitoring Gruben rock glacier, Swiss Alps
  • Alps (The) ; Creep ; Glacier dynamics ; Glacier fluctuation ; Glacier mass balance ; Mountain ; Permafrost ; Photogrammetry ; Photointerpretation ; Rock glacier ; Switzerland ; Valais
  • 1997
  • Permafrost distribution and temperatures in Europe during the Younger Dryas
  • Air temperature ; Europe ; Geochronology ; Ice wedges ; Palaeoclimate ; Periglacial features ; Permafrost ; Pleistocene ; Quaternary ; Spatial variation ; Temperature
  • 1997
  • Asian part of Russia ; Buryatiya ; Eastern Siberia ; Groundwater ; Hydrogeology ; Periglacial features ; Permafrost ; Water pollution
  • permafrost : les taliks (interruptions dans le permafrost) protègent de la pollution les eaux souterraines situées sous la couche gelée.
  • 1997
  • Austria ; Climate ; Geomorphogenesis ; Glacier ; Permafrost ; Regional geology ; Rock glacier ; Tirol
  • Après une introduction sur les glaciers rocheux et le permafrost et une présentation de la région étudiée, de sa géologie et de son climat, les AA. présentent la transformation périglaciaire des glaciers rocheux. Ils décrivent 2 glaciers rocheux de
  • 1997
  • Colluvium ; Earth surface processes ; Mountain ; Palaeoclimate ; Palaeogeomorphology ; Periglacial features ; Permafrost ; Rock glacier ; Slope dynamics ; Stratigraphy ; United States of America ; Utah
  • was compared to other similar types of deposits, and the AA. conclude that it is a fossil permafrost-derived rock glacier.
  • 1997
  • Banks Island ; Canada ; Classification ; Frost action ; Geomorphogenesis ; Lake level ; Northwest Territories ; Palaeogeography ; Periglacial features ; Permafrost ; Pingo ; Thermokarst
  • An unusually wide variety of pingo landforms located within a relatively restricted area of thick surficial sediments and permafrost is documented. Pingo growth and decay may occur independent of climatic change as witnessed by examples of embryonic
  • 1997
  • Conséquences du climat froid pléistocène, en particulier du permafrost, dans les sédiments de l'Ostfalen oriental (coins de glace, sables mouvants loessiques, vallées asymétriques)
  • Germany ; Ice ; Ice wedge ; Loess ; Niedersachsen ; Palaeoclimate ; Periglacial features ; Permafrost ; Pleistocene ; Sedimentology ; Valley
  • 1997
  • Austria ; Avalanche ; Dating ; Earthquake ; Ecology ; Geomorphology ; Inundation ; Legislation ; Natural hazards ; Permafrost ; Rockfall ; Soil erosion ; Torrent
  • Mise à jour par l'A. de sa publication de 1997 sur les riques géomorphologiques naturels. Nouveaux résultats de recherche : répartition et caractéristiques du permafrost dans les Alpes orientales ; datation de vastes chutes de pierres considérées du
  • 1997