inscription
Portail d'information géographique

Résultats de la recherche (2086 résultats)

Affinez votre recherche

Par Collection Par Auteur Par Date Par Sujet Par Titre Par ville ? Par pays ? Par continent ?
Development and application of a method to estimate short-term alpine sediment transfer in the Colorado Front Range, U.S.A.
  • Development and application of a method to estimate short-term alpine sediment transfer in the Colorado Front Range, U.S.A.
  • Bassin-versant ; Bilan sédimentaire ; Colorado ; Dynamique de versant ; Erosion des sols ; Etats-Unis ; Front Range ; Géographie physique
  • Using photogeologic techniques to develop a terrain classification, clastic sediment movement was evaluated in the Roaring River Watershed in the Colorado Front Range. - (DWG)
Forest vegetation of the Colorado Front Range. Composition and dynamics
  • Forest vegetation of the Colorado Front Range. Composition and dynamics
  • Auto-écologie ; Colorado ; Dynamique de la végétation ; Etats-Unis ; Forêt ; Front Range ; Géographie de l'Amérique ; Montagne ; Synécologie descriptive ; Végétation
Fire history of a ponderosa pine/Douglas fir forest in the Colorado front range
  • Fire history of a ponderosa pine/Douglas fir forest in the Colorado front range
  • Biogéographie ; Colorado ; Datation ; Etats-Unis ; Feu ; Forêt ; Montagne ; Sylviculture
  • Biogeography ; Colorado ; Dating ; Fire ; Forest ; Forestry ; Mountain ; United States
  • The main objectives of this study are : 1) to characterize the fire regime of an area of montane forest in the Colorado Front Range; and 2) to compare the utility of the different methods of dating fires in these forests.
Tree-growth response to Enso events in the central Colorado Front Range
  • Tree-growth response to Enso events in the central Colorado Front Range
  • Circulation atmosphérique ; Colorado ; Dendrochronologie ; Dendrologie ; El Niño ; Etats-Unis ; Interaction océan-atmosphère ; Oscillation climatique ; Réchauffement climatique ; Température
  • Atmospheric circulation ; Climate oscillation ; Climatic warming ; Colorado ; Dendrochronology ; Dendrology ; El Niño ; Ocean atmosphere interaction ; Temperature ; United States
  • The inflence of climate associated with El Niño/Southern Oscillation (ENSO) events on tree growth in the central Colorado Front Range is investigated through the analysis of two high altitude tree-ring chronologies. Dendrochronological techniques
  • are used to determine if ENSO-related climatic effects are detectable in tree-ring width patterns in the central Colorado Front Range. The form of the tree growth response is identified and the variability of the influence of these events on tree growth
The effect of slope-aspect on turbulent transfer in an alpine fellfield : Niwot Ridge, Front Range, Colorado
  • The effect of slope-aspect on turbulent transfer in an alpine fellfield : Niwot Ridge, Front Range, Colorado
  • Climat local ; Colorado ; Ecoulement turbulent ; Etats-Unis ; Front Range ; Géographie physique ; Montagne ; Topoclimat ; Vent
Lake Devlin and Pinedale glacial history, Front Range, Colorado
  • Lake Devlin and Pinedale glacial history, Front Range, Colorado
  • Colorado ; Datation radiocarbone ; Etats-Unis ; Front Range ; Glaciaire ; Glaciation de Pinedale ; Géochronologie ; Géographie physique ; Lake Devlin ; Montagne ; Pléistocène supérieur ; Quaternaire zones moyennes ; Rocky Mountains ; Stratigraphie
Temporal and spatial variations in the solute content of an alpine stream, Colorado Front Range
  • Temporal and spatial variations in the solute content of an alpine stream, Colorado Front Range
  • Bassin-versant ; Colorado ; Dénudation ; Etats-Unis ; Front Range ; Géochimie ; Géographie physique ; Hydrologie ; Qualité de l'eau
  • In this paper, the AA. report on a seven-year study of the geochemistry of stream water draining an alpine catchment in the Colorado Front Range. This work has been part of an ongoing program of Long Term Ecological Research (LTER) and has three
Weathering status of present-day eolian infall and alpine tundra surfaces, Front Range, Colorado
  • Weathering status of present-day eolian infall and alpine tundra surfaces, Front Range, Colorado
  • Analyse quantitative ; Colorado ; Eolien ; Erosion éolienne ; Etage alpin ; Etats-Unis ; Front Range ; Géographie physique ; Microscope à balayage électronique ; Montagne ; Pédogenèse ; Toundra
  • Etude des retombées éoliennes en tant que processus pédogénétique en zone alpine, Front Range, Colorado. Analyse de la surface des grains par microscopie électronique à balayage.
A dendrogeomorphological analysis of snow avalanches in the Colorado Front Range, USA
  • A dendrogeomorphological analysis of snow avalanches in the Colorado Front Range, USA
  • Avalanche ; Colorado ; Dendrologie ; Etats-Unis ; Montagne ; Neige ; Paléogéomorphologie ; Prévision ; Risque
  • Avalanche ; Colorado ; Dendrology ; Forecast ; Mountain ; Palaeogeomorphology ; Risk ; Snow ; United States of America
  • In this study, dendrogeomorphological techniques are used to develop avalanche event chronologies and to reconstruct past slide magnitude at two sites located near Loveland Pass, Colorado Front Range. Avalanche path reconstruction
Geochemistry and source waters of rock glacier outflow, Colorado Front Range
  • Geochemistry and source waters of rock glacier outflow, Colorado Front Range
  • Analyse isotopique ; Colorado ; Eau de fonte ; Ecoulement glaciaire ; Etats-Unis ; Glacier ; Glacier rocheux ; Géochimie ; Modèle ; Montagne ; Neige
  • Colorado ; Geochemistry ; Glacial flow ; Glacier ; Isotope analysis ; Meltwater ; Model ; Mountain ; Rock glacier ; Snow ; United States of America
  • 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
Temporal trends in the quality of streamwater in an alpine environment: Green Lakes Valley, Colorado Front Range, USA
  • Temporal trends in the quality of streamwater in an alpine environment: Green Lakes Valley, Colorado Front Range, USA
  • Charge en suspension ; Colorado ; Cours d'eau ; Ecosystème ; Etats-Unis ; Front Range ; Hydrochimie ; Montagne ; Pollution ; Qualité de l'eau ; Variation saisonnière ; Végétation
  • Colorado ; Ecosystem ; Front Range ; Hydrochemistry ; Mountain ; Pollution ; Seasonal variation ; Stream ; Suspended load ; United States of America ; Vegetation ; Water quality
  • The A. reports empirical records of water quality at four high elevation sites in the alpine environment of the Green Lakes Valley, east of the Continental Divide in the Front Range. At these sites, partial records for the past 25 years, and more
  • [b1] Institute of Arctic and Alpine Research, and Department of Geography, University of Colorado, Boulder, Colorado, Etats-Unis
Evidence for cirque glaciation in the Colorado Front Range during the Younger Dryas chronozone
  • Evidence for cirque glaciation in the Colorado Front Range during the Younger Dryas chronozone
  • Cirque glaciaire ; Colorado ; Datation C 14 ; Etats-Unis ; Fluctuation du glacier ; Glaciaire ; Géochronologie ; Moraine ; Paléogéographie ; Pléistocène ; Propriétés du sol
  • C 14 dating ; Cirque ; Colorado ; Geochronology ; Glacial features ; Glacier fluctuation ; Moraine ; Palaeogeography ; Pleistocene ; Soil properties ; United States of America
  • The AA. present evidence that indicates a limited advance of alpine glaciers occured in the Colorado Front Range Mountains during the Younger Dryas Chron. Sky Pond was selected for this study because it is situated directly downvalley from a moraine
  • with relative-age features similar to those of early Holocene to late Pleistocene glacial landforms in the Colorado Front Range.
  • [b1] Inst. Artic and Alpine Research, Dep. Geography, Univ. Colorado, Boulder, Etats-Unis
Late Pleistocene glacial equilibrium-line altitudes in the Colorado Front Range: a comparison of methods
  • Late Pleistocene glacial equilibrium-line altitudes in the Colorado Front Range: a comparison of methods
  • Colorado Front Range ; Etats-Unis ; Glaciation ; Géographie physique ; Ligne d'équilibre glaciaire ; Montagne ; Méthodologie ; Paléoclimatologie ; Pléistocène supérieur ; Quaternaire zones moyennes ; Surfaces de tendance
  • Six methods for approximating late Pleistocene (Pinedale) equilibrium-line altitude (ELAs) are compared for rapidity of data collection and error (RMSE) from first-order trend surfaces, using the Colorado Front Range. Second-order trend surfaces
  • demonstrate low ELAs in the latitudinal center of the Front Range, perhaps due to higher winter accumulation there. The mountains do not presently reach the ELA for large glaciers, and small Front Range cirque glaciers are not comparable to small glaciers
Luftbild Arapaho-Pass, Colorado Front Range, USA. (Photographie aérienne du col Arapaho, Colorado Front Range, Etats-Unis)
  • Luftbild Arapaho-Pass, Colorado Front Range, USA. (Photographie aérienne du col Arapaho, Colorado Front Range, Etats-Unis)
  • Colorado Front Range ; Etats-Unis ; Formation végétale ; Glaciaire ; Géographie de l'Amérique ; Géomorphodynamique ; Haute montagne ; Modelé glaciaire ; Montagne ; Photo-interprétation ; Périglaciaire ; Rocky Mountains ; Végétation ; Zone
Flood geomorphology of Arthurs Rock Gulch, Colorado: paleoflood history
  • Flood geomorphology of Arthurs Rock Gulch, Colorado: paleoflood history
  • Bassin-versant ; Colluvions ; Colorado ; Crue ; Datation C 14 ; Dendrochronologie ; Etats-Unis ; Géochronologie ; Quaternaire
  • C 14 dating ; Colluvium ; Colorado ; Dendrochronology ; Flood ; Geochronology ; Quaternary ; United States ; Watershed
  • The AA. present evidence for multiple late Quaternary paleofloods in Arthurs Rock Gulch, a small ephemeral drainage basin in the Colorado Front Range foothills near Fort Collins, Colorado; and describe their approach to paleoflood retrodiction
Anthropogenic disturbance and recovery patterns in montane forests, Colorado Front Range
  • Anthropogenic disturbance and recovery patterns in montane forests, Colorado Front Range
  • Action anthropique ; Aire floristique ; Biogéographie ; Colorado ; Déforestation ; Etats-Unis ; Feu ; Forêt ; Géographie physique ; Montagne ; Synécologie descriptive
The significance of rainsplash in the surficial debris cascade of the Colorado Front Range foothills
  • The significance of rainsplash in the surficial debris cascade of the Colorado Front Range foothills
  • Colorado ; Colorado Front Range ; Dynamique de versant ; Erosion pluviale ; Etats-Unis ; Géographie de l'Amérique ; Montagne ; Précipitation ; Sédimentologie ; Versant
  • Les caractéristiques superficielles et le régime de précipitations des versants partiellement dénudés dans la zone montagnarde du Colorado Front Range suggèrent que l'érosion pluviale peut être une composante importante de la chute superficielle des
Long-term flow measurements (1961-2002) of the Arapaho, Taylor, and Fair Rock glaciers, Front Range, Colorado
  • Long-term flow measurements (1961-2002) of the Arapaho, Taylor, and Fair Rock glaciers, Front Range, Colorado
  • Années 1961-2002 ; Changement climatique ; Colorado ; Etats-Unis ; Glacier ; Glacier rocheux ; Montagne ; Pergélisol ; Reptation
  • Climatic change ; Colorado ; Creep ; Glacier ; Mountain ; Permafrost ; Rock glacier ; United States of America
  • 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
  • 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
What should these rivers look like? Historical range of variability and human impacts in the Colorado Front Range, USA
  • What should these rivers look like? Historical range of variability and human impacts in the Colorado Front Range, USA
  • Action anthropique ; Colorado ; Cours d'eau ; Epoque historique ; Etats-Unis ; Front Range ; Gestion de l'environnement ; Géométrie hydraulique ; Montagne
  • Channel geometry ; Colorado ; Environmental management ; Front Range ; Historical period ; Human impact ; Mountain ; Stream ; United States of America
  • Acción antrópica ; Colorado ; Corriente de agua ; Estados Unidos ; Geometria hidráulica ; Gestión del medio ambiente ; Montaña ; Época histórica
  • usefully applied to spatially differentiated geomorphic process domains with distinctive form and process. Using the Colorado Front Range as an example, 3 examples of how knowledge of HRV can assist river management and restoration are discussed
  • Historical range of variability (HRV) describes the range of temporal and spatial variations in river variables such as flow regime or channel planform prior to intensive human alteration of the ecosystem. In mountainous river networks, HRV is most
  • [b1] Dep. of Geosciences, Colorado State Univ., Fort Collins, Etats-Unis
Forest fire and the natural sol erosion regima in the Colorado Front Range
  • Forest fire and the natural sol erosion regima in the Colorado Front Range
  • Action anthropique ; Colorado Front Range ; Erosion des sols ; Etats-Unis ; Feu ; Forêt ; Géographie de l'Amérique ; Rocky Mountains