inscription
Portail d'information géographique

Résultats de la recherche (46 résultats)

Affinez votre recherche

Par Collection Par Auteur Par Date Par Sujet Par Titre
Electrical resistivity tomography as a tool for geomorphological investigations - some case studies.
  • Electrical resistivity tomography as a tool for geomorphological investigations - some case studies.
  • Eau ; Electricité ; Géomorphologie ; Géophysique ; Loess ; Pergélisol ; Sable ; Sédimentaire ; Tomographie
  • La tomographie est utilisée pour déterminer la structure des surfaces. L'A. donne des exemples de mesures concernant des matériaux plus ou moins conducteurs. Des connaissances géologiques et géomorphologiques sont nécessaires pour interpréter les
Subsurface architecture of the Boulder Creek Critical Zone Observatory from electrical resistivity tomography
  • Subsurface architecture of the Boulder Creek Critical Zone Observatory from electrical resistivity tomography
  • Colorado ; Critical zone ; Electrical resistivity tomography ; Geophysics ; Mountain ; Slope deposit ; United States of America ; Watershed ; Weathering
  • Bassin-versant ; Boulder Creek ; Colorado ; Dépôt de pente ; Etats-Unis ; Géophysique ; Montagne ; Météorisation ; Tomographie de résistivité électrique ; Zone critique
  • The AA. have used electrical resistivity tomography, a well-established geophysical technique causing minimum surficial disturbance, to portray the subsurface electrical resistivity differences at 3 study sites (Green Lakes Valley; Gordon Gulch
  • allows to image the critical zone architecture of each site. In general, the data are consistent with results from seismic studies, but electrical resistivity tomography documents a shallower critical zone above the weathered bedrock on average
  • ; Betasso) at the Boulder Creek Critical Zone Observatory (BcCZO). Possible limitations of the technique are discussed. Interpretation of the specific resistivity values using natural outcrops, pits, roadcuts and drilling data as ground truth information
Mudboil and ice-wedge dynamics investigated by electrical resistivity tomography, ground temperatures and surface movements in Svalbard
  • Mudboil and ice-wedge dynamics investigated by electrical resistivity tomography, ground temperatures and surface movements in Svalbard
  • Active layer ; Arctic Region ; Electrical resistivity tomography ; Freeze-thaw cycle ; Geophysics ; Ice wedge ; Patterned ground ; Periglacial features ; Permafrost ; Soil properties ; Soil temperature ; Svalbard
  • Arctique ; Coin de glace ; Cycle gel-dégel ; Géophysique ; Mollisol ; Pergélisol ; Propriétés du sol ; Périglaciaire ; Sol figuré ; Svalbard ; Température du sol ; Tomographie de résistivité électrique
  • The AA. applied electrical resistivity tomography (ERT) to understand near-surface conditions of 2 types of patterned ground, ice-wedge polygons and mudboils in Svalbard. Automated monitoring shows surface movement characterized by annual cycles
  • of frost heave and thaw settlement, the amounts and rates of which are influenced by the intensity of ice segregation. A time series of ERT shows (1) a distinct resistivity boundary delimiting the active-layer depth, (2) seasonal variation in resistivity
  • controlled by thermo-hydrological dynamics and (3) spatial variation in resistivity reflecting desiccation in summer and intensive ice segregation in winter. These results demonstrate ERT as a useful complementary technique for monitoring active-layer depths
Evaluation of trenching, ground penetrating radar (GPR) and electrical resistivity tomography (ERT) for sinkhole characterization
  • Evaluation of trenching, ground penetrating radar (GPR) and electrical resistivity tomography (ERT) for sinkhole characterization
  • Aragón ; Collapse structures ; Ebro ; Electrical resistivity tomography ; Geophysics ; Ground penetrating radar ; Karst ; Research technique ; Spain ; Stratigraphy ; Subsidence ; Watershed
  • Aragón ; Bassin-versant ; Ebro ; Effondrement ; Espagne ; GPR ; Géophysique ; Karst ; Stratigraphie ; Subsidence ; Technique de recherche ; Tomographie de résistivité électrique
  • This paper explores the suitability and advantages of combining the trenching technique with geophysical surveys [ground penetrating radar (GPR) and electrical resistivity tomography (ERT)] for sinkhole characterization in a mantled karst area
Characteristics of discontinuous permafrost based on ground temperature measurements and electrical resistivity tomography, Southern Yukon, Canada
  • Characteristics of discontinuous permafrost based on ground temperature measurements and electrical resistivity tomography, Southern Yukon, Canada
  • Canada ; Climatic variability ; Cold area ; Electrical resistivity tomography ; Geophysics ; Ground ice ; Northwest Territories ; Palsa ; Periglacial features ; Permafrost ; Thermal regime ; Yukon
  • Canada ; Glace du sol ; Géophysique ; Northwest Territories ; Palse ; Pergélisol ; Périglaciaire ; Régime thermique ; Tomographie de résistivité électrique ; Variabilité climatique ; Yukon ; Zone froide
  • °N), using a combination of ground temperature monitoring, electrical resistivity tomography (ERT), frost table probing and coring. Sites were selected to cover a wide range of substrates, vegetation types and ground ice contents. ERT profiling
The contribution of Electrical Resistivity Tomography (ERT) in Alpine dynamics geomorphology : case studies from the Swiss Alps
  • The contribution of Electrical Resistivity Tomography (ERT) in Alpine dynamics geomorphology : case studies from the Swiss Alps
  • Alluvial plain ; Alps (The) ; Conceptual model ; Earth surface processes ; Electrical resistivity tomography ; Geophysics ; Landslide ; Mountain ; Permafrost ; Rhône ; Surface deposits ; Switzerland ; Ticino ; Valais
  • Alpes ; Formation superficielle ; Glissement de terrain ; Géomorphodynamique ; Géophysique ; Modèle conceptuel ; Montagne ; Pergélisol ; Plaine alluviale ; Rhône ; Suisse ; Ticino ; Tomographie de résistivité électrique ; Valais
  • Trois cas d'étude ont été choisis dans les Alpes suisses pour illustrer les potentialités de la méthode de Tomographie des Résistivités Electriques (TRE) pour l'étude des formes dans des environnements dynamiques de montagne : le 1er concerne
New insights into mountain permafrost occurrence and characteristics in glacier forefields at high altitude through the application of 2D resistivity imaging
  • New insights into mountain permafrost occurrence and characteristics in glacier forefields at high altitude through the application of 2D resistivity imaging
  • The results of the investigation in the Upper Engadine permafrost during 1996-1998 (one-dimensional geoelectrical soundings) and 2002 (two-dimensional electrical resistivity tomography) are presented and discussed. This contribution illustrates
  • the potential of two-dimensional DC resistivity tomography for applications in periglacial geomorphology providing a more comprehensive characterization of the subsurface lithology and the small scale permafrost distribution.
Fusion of multi-resolution surface (terrestrial laser scanning) and subsurface geodata (ERT, SRT) for karst landform investigation and geomorphometric quantification
  • Crete ; Digital elevation model ; Doline ; Electrical resistivity tomography ; Geographical information system ; Geomorphometry ; Geophysics ; Greece ; Karst ; Karstification ; Methodology ; Sedimentology ; Seismic tomography ; Terrestrial laser
  • Balayage laser terrestre ; Doline ; Grèce ; Géomorphométrie ; Géophysique ; Karst ; Karstification ; Kriti ; Modèle numérique de terrain ; Méthodologie ; Système d'information géographique ; Sédimentologie ; Tomographie de résistivité électrique
  • ; Tomographie sismique
  • A multi-method research design based on terrestrial laser scanning, GIS, geophysical prospecting (electrical resistivity tomography, refraction seismics) and sedimentology is applied to investigate enclosed karst depressions in an integrated way
Automated time-lapse ERT for improved process analysis and monitoring of frozen ground
  • Alps (The) ; Electrical resistivity tomography ; Freezing ; Geophysics ; Infiltration ; Mountain ; Periglacial features ; Permafrost ; Snow cover ; Switzerland ; Thawing
  • Alpes ; Dégel ; Gel ; Géophysique ; Infiltration ; Manteau nival ; Montagne ; Pergélisol ; Périglaciaire ; Suisse ; Tomographie de résistivité électrique
  • A new automated electrical resistivity tomography (A-ERT) system is described that allows continuous measurements of the electrical resistivity distribution in high-mountain or polar terrain. The advantages of continuous resistivity monitoring
Terrestrial laser scanning and electrical resistivity tomography as combined tools for the geoarchaeological study of the Kritsa-Latô dolines (Mirambello, Crete, Greece)
  • Terrestrial laser scanning and electrical resistivity tomography as combined tools for the geoarchaeological study of the Kritsa-Latô dolines (Mirambello, Crete, Greece)
  • Archaeology ; Crete ; Digital elevation model ; Doline ; Earth surface processes ; Electrical resistivity tomography ; Geoarchaeology ; Greece ; Human occupation ; Karst ; Quaternary ; Sedimentology ; Society-environment relationship ; Terrestrial
  • ; Tomographie de résistivité électrique
  • L'utilisation combinée du scanner laser terrestre (SLT), de tomographie de résistivité électrique (TRE) et l'intégration des résultats géophysiques et morphométriques dans un Système d'Information Géographique (SIG) ont permis l'interprétation des
Detection of soil moisture and vegetation water abstraction in a Mediterranean natural area using electrical resistivity tomography
  • Detection of soil moisture and vegetation water abstraction in a Mediterranean natural area using electrical resistivity tomography
  • In this study, the AA. evaluated the possibilities of using Electrical Resistivity Tomography (ERT) to measure soil moisture availability and plant water use in a Mediterranean natural area. They found that ERT is a useful tool for measuring soil
Arctic rockwall retreat rates estimated using laboratory-calibrated ERT measurements of talus cones in Longyeardalen, Svalbard
  • Arctic Region ; Cold area ; Debris cone ; Electrical resistivity tomography ; Erosion rate ; Geographical information system ; LiDAR ; Permafrost ; Polar region ; Slope dynamics ; Svalbard
  • Arctique ; Cône d'éboulis ; Dynamique de versant ; LiDAR ; Pergélisol ; Région polaire ; Svalbard ; Système d'information géographique ; Tomographie de résistivité électrique ; Vitesse d'érosion ; Zone froide
  • Here the AA. investigate Holocene rockwall retreat of exposed arctic sandstone cliffs in Longyeardalen, central Svalbard and apply laboratory-calibrated electrical resistivity tomography (ERT) to determine talus sediment thickness. Temperature
  • -resistivity functions of 2 sandstone samples are measured in the laboratory and compared with borehole temperatures from the talus slope. High-resolution LiDAR-scanning and ERT subsurface information were collated in a GIS to interpolate the bedrock surface
Der Blick in den Untergrund : Magnetometrie und Geoelektrische Tomographie in der Geoarchäologie
  • Der Blick in den Untergrund : Magnetometrie und Geoelektrische Tomographie in der Geoarchäologie
  • Regard à travers le sol : magnétométrie et tomographie géo-électrique en géo-archéologie
  • Antiquité ; Archéologie ; Géoarchéologie ; Image ; Instrumentation ; Magnétométrie ; Sol ; Tomographie
  • La magnétographie et la tomographie sont deux méthodes géophysiques non destructrices utilisées pour analyser les sites archéologiques, évaluer leur profondeur et leurs structures.
Electrical imaging of sliding geometry and fluids associated with a deep seated landslide (La Clapière, France)
  • Alpes du Sud ; Alpes-Maritimes ; Electrical resistivity tomography ; France ; Geophysics ; Landslide ; Methodology ; Slope ; Slope dynamics
  • Alpes du Sud ; Alpes-Maritimes ; Dynamique de versant ; France ; Glissement de terrain ; Géophysique ; Méthodologie ; Tomographie de résistivité électrique ; Versant
  • This paper deals with the applicability of electrical resistivity tomography (ERT) for the recognition of large landslide structures at depths, which have never previously been imaged accurately. One of the most studied and instrumented deep
An undercooled scree slope detected by geophysical investigations in sporadic permafrost below 1000 M ASL, Central Austria
  • Alps (The) ; Austria ; Electrical resistivity tomography ; Geophysics ; Ground-penetrating radar ; Microclimate ; Mountain ; Periglacial features ; Permafrost ; Plant cover ; Seismic refraction ; Soil temperature
  • Alpes ; Autriche ; Couverture végétale ; Géophysique ; Microclimat ; Montagne ; Pergélisol ; Périglaciaire ; Radar géologique ; Sismique réfraction ; Température du sol ; Tomographie de résistivité électrique
  • permafrost. Geophysical measurements with electrical resistivity tomography, ground-penetrating radar and seismic refraction indicate the presence of several isolated areas of frozen ground over a full year, far below the regional lower limit of mountain
Investigations into the relationship between changes in internal moisture regimes and rock surface deterioration in cavernous sandstone features
  • Biogenic process ; Electrical resistivity tomography ; Free State ; Geophysics ; Moisture ; Sandstone ; South Africa ; Taffoni ; Temperature ; Weathering
  • Action biogène ; Afrique du Sud ; Free State ; Golden Gate Highlands National Park ; Grès ; Géophysique ; Humidité ; Météorisation ; Taffoni ; Température ; Tomographie de résistivité électrique
  • , South Africa (GGHNP). Data are presented from surveys of internal moisture (using electrical resistivity tomography, ERT), surface moisture (using a Protimeter) and deterioration (using surface hardness as recorded with an Equotip as a proxy for surface
Geophysical prospection on Late Quaternary sediments in the Gállego Valley, Central Spanish Pyrenees
  • Aragón ; Electrical resistivity tomography ; Fluvial processes ; Geophysics ; Glacial features ; Periglacial features ; Pyrénées ; Quaternary ; Seismic refraction ; Spain ; Stratigraphy ; Upper Pleistocene
  • Aragón ; Espagne ; Fluviatile ; Glaciaire ; Géophysique ; Pléistocène supérieur ; Pyrénées ; Périglaciaire ; Quaternaire ; Sismique réfraction ; Stratigraphie ; Tomographie de résistivité électrique
  • The AA. used a combination of geophysical prospection techniques, including shallow seismic refraction (SSR) and electric resistivity tomography (ERT). They focus on 2 selected study sites : the Late Pleistocene terminal moraine at Senegüé
Assessment of doline geometry using geophysics on the Quercy plateau karst (South France)
  • Aquifer ; Carbonate rock ; Doline ; Electrical resistivity tomography ; Environmental conservation ; France ; Geophysics ; Karst ; Lot ; Midi-Pyrénées ; Seismic method
  • Doline ; France ; Géophysique ; Karst ; Lot ; Midi-Pyrénées ; Nappe aquifère ; Protection de l'environnement ; Roche carbonatée ; Sismique ; Tomographie de résistivité électrique
  • reveals other dolines that are hidden by soil cover. Electrical resistivity and seismic refraction tomography provide detailed cross-sections. Even though the dolines studied are close one to another, they exhibit great variability in shape and content
The role of rock surface hardness and internal moisture in tafoni development in sandstone
  • Cave ; Conceptual model ; Electrical resistivity tomography ; Moisture ; Piedmont ; Sandstone ; South Africa ; Taffoni ; Weathering
  • Afrique du Sud ; Drakensberg ; Grotte ; Grès ; Humidité ; Modèle conceptuel ; Météorisation ; Piedmont ; Taffoni ; Tomographie de résistivité électrique
  • In this study, Electric Resistivity Tomography (ERT) has been used to map moisture distribution within inner walls of tafoni developed in sandstone, and an Equotip device used to measure rock surface hardness as a proxy measure of the degree
Geophysical surveys designed to delineate the altitudinal limit of mountain permafrost : an example from Jotunheimen, Norway
  • Three geophysical methods (DC resistivity tomography, refraction seismic tomography and electromagnetic profiling (EM-31) in comparison with direct temperature measurements) have been applied to delineate the altitudinal limit of Jotunheimen