GGD290_1

Rock glaciers, Entremont, Valais, Switzerland, Version 1

Version 1 eng; usa
  • Abstract
    The Entremont area is 300 square km wide and located in the western part of the Swiss Alps between the Mont-Blanc Massif and the Valaisian Alps, slightly north of the main crest of the alpine range. Altitude varies between 4313 m above see level (asl) at the top of the Grand-Combin and 714 m asl for the outlet of the valleys system. The geological composition is essentially dominated by metamorphic rocks (gneiss, shale, quartzite), however some sedimentary layers (limestone, dolomite) are inserted. The mean annual air temperature is about 0 C at 2300 m asl and annual precipitation among ranges between 1000 and 1500 mm at 2000 m asl with a maximum value of about 2000 mm on the alpine crest (Grand-St-Bernard pass). Equilibrium line of glaciers is over 3000 m asl in the north-facing slopes, the timberline is at about 2100 m asl and permafrost creeping features exist between 2000 and 3000 m asl, what results in a great variety of mountain and morphological landscapes. Aerial photographs analyses and field morphological observations have been performed during summer 1995 in order to inventory and map (1 to 25000) 321 well-developed to embryonic rock glaciers and protalus lobes (coexisting features have been separated) of total area 10.4 square. km. Rock glacier activity classification results from interpretation of both geomorphological and environmental signs. Some geophysics (BTS measurements and DC resistivity soundings) have been performed between 1995 and 1997 on a few rock glaciers in order to confirm the initial interpretation. Data described in this file on the CAPS Version 1.0 CD-ROM, June 1998, are-- 1. Location (X, Y)-- Swiss coordinates near the center of the feature. 2. Front elevation (Z)-- Elevation (m a.s.l.) at the foot of the front (accuracy: 10 m). 3. Length-- Maximal distance (m) between front and roots (accuracy: 10 - 20%). 4. Width-- Mean width (m) of the feature (accuracy: 10%). 5. Orientation-- Global exposition of the rock glacier. 6. Activity-- Interpretation by field indicators observation, only in a few cases by geophysics. 7. Surface (ha)-- Calculated by 1 to 25,000 numerical mapping (accuracy: 5 - 10%). 8. Origin-- Talus or moraine (debris) derived rock glacier ? Other information such as lithology, spring temperature, vegetation cover, inclination, roots elevation are partly available, but not described in the present data set.
  • Purpose
    Scientific Research

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    Processing Level

    Not Applicable

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    Collection Progress

    Complete

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    Science Keywords
    • EARTH SCIENCE
    • Cryosphere
    • Frozen Ground
    • Permafrost
    • EARTH SCIENCE
    • Land Surface
    • Frozen Ground
    • Permafrost
    • EARTH SCIENCE
    • Cryosphere
    • Frozen Ground
    • Rock Glaciers
    • EARTH SCIENCE
    • Land Surface
    • Frozen Ground
    • Rock Glaciers
    • EARTH SCIENCE
    • Cryosphere
    • Snow/Ice
    • Snow/Ice Temperature

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    Instruments

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    Coverage Type Zone Identifier Geometry Granule Representation
    HORIZONTAL CARTESIAN GEODETIC
Location Keywords
    • Continent
    • Europe
    • Western Europe
    • Switzerland
    • Entremont, Central and Western Alps, Valais, Switzerland

Data Centers

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  • National Snow and Ice Data Center
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    National Snow and Ice Data Center
    CIRES, 449 UCB
    University of Colorado
    Boulder, CO 80309-0449

    • 1 303 492 6199
    • 1 303 492 2468
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  • National Snow and Ice Data Center
    DISTRIBUTOR

    National Snow and Ice Data Center
    CIRES, 449 UCB
    University of Colorado
    Boulder, CO 80309-0449

    • 1 303 492 6199
    • 1 303 492 2468
    • Email

Data Contacts

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  • Reynald
    Technical Contact
    Reynald Delaloye

    Perolles
    Fribourg, CH-1700

    • 41 26 300 90 21
    • 41 26 300 90 10
    • 41 26 300 97 46
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  • Sonia
    Technical Contact
    Sonia Morand

    Fribourg, CH-1700

    • 41 26 3009010
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  • Delaloye,
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    Delaloye, L.Wenker

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    • Rock glaciers, Entremont, Valais, Switzerland, Version 1
      1

      Published by: National Snow and Ice Data Center