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COURS GEOPHYSIQUE PDF

En tant qu’offre de formation à la recherche, le parcours Géophysique s’adresse à des étudiant(e)s désireux(ses) d’entreprendre une thèse de doctorat dans. Les principales sociétés d’exploration géophysique occidentales .. IFREMER, Brest, Géosciences marines, Océanographie spatiale, Cours de télédétection, . Ce site présente le laboratoire de géophysique et de géostatistique de l’école Polytechnique de Montréal: Travaux de recherche ; Notes de Cours ; et autres.

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The multi-method geophysical prospecting of alpine permafrost in the Sceru Valley southern Swiss Alps, Ticino Canton with thermal methods spring temperature and ground surface temperature monitoringDC-resistivity method Vertical Electrical Sounding and electromagnetic methods VLF-R and conductivity-meter EM 31allowed determining the permafrost distribution and characteristics in the investigated rockglaciers and talus slopes.

The permafrost distribution is quite homogeneous in the rockglaciers, where it is generally controlled by the topoclimatic conditions of the site. In the talus slopes, the permafrost distribution is gepphysique heterogeneous and the probability of permafrost occurrence decreases upslope.

The main processes controlling this particular permafrost distribution are the chimney effect, the redistribution of snow by wind and avalanches and, finally, the increase of grain size downslope. The study also allowed testing electromagnetic methods and to validating their application in the prospecting of alpine permafrost. Un remerciement particulier aux quatre relecteurs anonymes et au Prof.

Le glacier geophysiqque de Sceru I fig. Le geophysiqeu rocheux de Sasso di Luzzone fig. Le glacier rocheux de Piancabella fig.

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In the lower part, photos of the six studied sites. Vertical Electrical Sounding; L Sur le glacier rocheux de Piancabella fig. Scapozza in the central part of the Yeophysique Valley A and evolution of the ground surface temperatures on the Piancabella talus slope Bon the Piancabella rockglacier C and on the Gana Rossa talus slope D.

For the localisation of the temperature data loggers, see fig. For the localisation of the VES, see fig. Le profil VLF01 fig. Le profil VLF02 fig. Vertical Electrical Sounding; 2: Pour la localisation des profils de tomographie, voir fig.

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For the localisation of the VLF-R tomographies, see fig. Autumnal early snow melt patches The circle allows us to situate the zone presented in B. Evacuation of air with a temperature of 3. Spring early snow melt patches Permafrost and Periglacial Processes7, Advances in periglacial geomorphology Wiley, Chichester, Journal of Applied Geophysics45, Pure and Applied Geophysics, Sedimentary Geology, Federal Office of Topography — Swisstopo, Berne.

Carta geologica speciale No. Landslides1, L’exemple du massif du Combeynot Hautes Alpes. Geophysics42, Geophysics18, GeoFocus8, Norsk Geografisk Tidsskrift59, Geological Survey of Canada, Ottawa. Permafrost and Periglacial Processes12, Permafrost and Periglacial Processes15, Geophysics43, Geophysics40, Permafrost and Periglacial Processes10, Applied geophysics in periglacial environments.

Cambridge University Press, Cambridge, Permafrost and Periglacial Processes17, Geomorphology52, Permafrost and Periglacial Processes11, Cold Regions Science and Technology15, Permafrost and Periglacial Processes3, Permafrost and Periglacial Processes19, Norsk Geografisk Tidsskrift55, Geomorphology21, Near Surface Geophysics1, Paper — Geological Survey of CanadaA, Meyer de Stadelhofen C.

Analyse spatiale multiscalaire et investigations environnementales.

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Application aux Alpes de Vanoise. Geomorphology76, Laterally constrained two-layer inversion of VLF-R measurements. Geomorphology80, Earth Surface Processes and Landforms26, Storia glaciale e periglaciale e patrimonio geomorfologico. Geologia Insubrica ,10 2 Geomorphology93, Geotechnical and Environmental Geophysics. Society of Exploration Geophysicists, Tulsa, Progress in Physical Geography26, During the last decades, several efforts were made to improve the application of geophysical methods in geomorphology Schrott et al.

In alpine periglacial contexts, multi-method geophysical prospecting was intensively applied to test the complementarity of methods, to identify the internal structure of permafrost, and to map the bi- and tri-dimensional spatial extension of frozen bodies Ishikawa and Hirakawa, ; Marescot et al.

In this study, multi-method geophysical prospecting of alpine permafrost in the Sceru Valley southern Swiss Alps, Ticino Canton with thermal methods spring temperature and ground surface temperature monitoringDC-resistivity method Vertical Electrical Sounding and electromagnetic methods VLF-R and conductivity-meter EM 31 is carried out. The area is a large east-facing glacial cirque characterised by large glacial and periglacial surface deposits, in particular moraines, rockglaciers and talus slopes Scapozza and Reynard, ; Scapozza and Fontana, Several rockglaciers and talus slopes were investigated.

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Three groups of methods were applied: Thermal measurements of both springs Haeberli, and ground surface Hoelzle et al. DC-resistivity method is one of the most extensively applied methods in frozen ground prospecting Fisch et al. The conductivity-meter EM 31 has also been poorly applied in alpine contexts Hauck, ; Hauck et al. Spring temperatures were measured on 10 sites.

Only one site presents temperatures between 0. Ground surface temperature was measured at 8 sites. Nine electrical soundings were carried out on the studied landforms and classified in three groups: Permafrost is assumed to be absent in the first two groups and present second layer in the third group.

The combination of methods allowed us to identify the permafrost distribution and characteristics in the investigated rockglaciers and talus slopes. The position of active and relict rockglaciers is coherent with the regional model of permafrost distribution Scapozza and Fontana, Only one rockglacier – Piancabella rockglacier – seems to be active. The possible occurrence of ice in the Sceru I rockglacier southern lobe may be explained by the blocky surface protection or by possible advective air circulation from the Sasso di Luzzone talus slope.

Advective thermal exchanges are certainly present in the Piancabella and Gana Rossa talus slopes due to chimney effect Lambiel, ; Lambiel and Pieracci, The redistribution of snow by wind and avalanches and the increase of grain size downslope are other factors explaining the possible presence of ice in the talus slopes. Finally, from a methodological point of view, three conclusions are highlighted: Multi-method geophysical prospecting of alpine permafrost in the southern Swiss Alps.

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Agrandir Original png, 78k. Agrandir Original png, 52k. Annexe Abridged English version During the last decades, several efforts were made to improve the application of geophysical methods in geomorphology Schrott et al. Table des illustrations Titre Fig.