Investigations regarding alpine talus slopes using ground-penetrating radar (GPR) in the Bavarian Alps, Germany
The applicability of ground-penetrating radar (GPR) for the investigation of loose debris was tested at 2 sites (Viererkar and Zugspitzplatt), in the Northern Alps near the German-Austrian border. The aim of the investigation was to record the base
of the debris layer, and thereby acquire an estimation of the backweathering rates of the adjacent rockwalls. The sites are characterized by steep limestone rockwalls and extensive talus accumulations. GPR seems to be a useful tool to evaluate the thickness
of slope deposits and may help to separate recent and past debris covers. However, best results are to be expected by using GPR in combination with conventional methods.
Internal structure of a barrier beach as revealed by ground penetrating radar (GPR) : Chesil beach, UK
Here, the AA. present a three-fold model for the evolution of Chesil Beach (Dorset) based on a series of 9 ground penetrating radar (GPR) traverses located at 3 sites along its length at Abbotsbury, Langton Herring and at Ferry Bridge. The case
of GPR in resolving the evolutionary history of gravel-rich coastal landforms such as Chesil Beach.
Ice- and soil-wedge dynamics in the Kapp Linné Area, Svalbard, investigated by two- and three-dimensional GPR and ground thermal and acceleration regimes
GPR is applied to image subsurface structures below non-sorted polygons in Kapp Linné, Svalbard, where ice and active-layer soil wedges co-exist within a small area. Two-dimensional GPR images ice wedges as hyperbolic reflections extending down from
the frost table. However, some ice-wedge signals are obscured or masked by similar hyperbolic reflections produced by stones or active-layer soil wedges. Three-dimensional GPR images ice wedges as linear amplitude anomalies, which excludes the possibility
of misinterpretation and offers more reliable results. GPR investigations show that ice wedges are distributed sporadically in lower (younger) beach ridges, but not in higher (older) ones. Inter-site monitoring of ground temperature, soil moisture, slow ground
with permafrost and periglacial conditions and provide evidence of climate change. In this study, buried relict cryogenic macrostructures were identified with Ground-penetrating Radar(GPR). On some two-dimensional GPR (2DGPR) records, boundaries with the host
materials are indistinguishable or blurred resulting in the features being overlooked, misinterpreted and/or imprecisely delineated. Three-dimensional GPR (3D GPR) was able to delineate buried networks of sediment-filled wedges and provided more meaningful
information than 2D radar records. When supplemented with adequate ground-truth observations, GPR offers considerable potential for imaging, interpreting and mapping near-surface cryogenic macrostructures in former periglacial environments.
Canada ; GPR ; Géophysique ; Québec ; Stratigraphie ; Technique de recherche ; Tourbière ; Zone boréale
This paper presents a review of recent ground-penetrating radar (GPR) applications to peatlands, particularly to determine peat stratigraphy. An example study of acquisition and comparison of peatland soil thickness of a fen-dominated watershed
located in the James Bay region of Quebec, using (1) a meter stick linked to a GPS RTK and (2) a GSSI GPR, is given. Disparities occurred mainly in the vicinity of ponds which can be explained by the attenuation of GPR signal in open water. Despite
these difficulties (the higher time required for analysis and the error margin) it seems more appropriate to use a GPR, instead of a graduated rod linked to a GPS, to measure the peat depths on a site like the one presented in this study.
Rock glaciers on Prins Karls Forland. II : GPR soundings and the development of internal structures
les structures internes de 4 glaciers rocheux de la zone du pergélisol continu sur l'île Prins Karls Forland, Svalbard occidental, ont été étudiées en utilisant un radar dont les ondes pénètrent le sol (GPR). Une étude comparative a été réalisée sur
Sedimentological and GPR studies of subglacial deposits in the Joux Valley (Vaud, Switzerland) : backset accretion in an esker followed by an erosive jökulhlaup
Etude sédimentologique et géophysique (radar GPR) des dépôts sous-glaciaires de la vallée de Joux (canton de Vaud, Suisse). Les données radar sur les drumlins gravelo-sableux, associées à des observations sédimentologiques, montrent qu'avant
Use of Ground Penetrating Radar (GPR) soundings for investigating internal structures in rock glaciers. Examples from Prins Karls Forland, Svalbard.
Les AA. présentent les quatre profils de glaciers rocheux obtenus par la méthode du GPR (Ground Penetrating Radar) au Svalbard à Prins Karls Forland (Norvège). Ils débattent des possibilités offertes par cette méthode pour étudier la structure
This paper presents results from an experiment to assess the use of ground-penetrating radar (GPR) to remotely sense pipes in blanket peat. The technique is shown to be successful in identifying most of the pipes tested in the pilot catchment
. Comparison of data on pipes identified by GPR and verified by manual measurement suggests that pipescan be located in the soil profile with a depth accuracy of 20 to 30 cm. GPR-identified pipes were found throughout the soil profile; however, those whithin 10
The AA. present ground penetrating radar (GPR)data combined with sedimentological methods to rapidly investigate study areas at a high resolution. This approach was tested in 2 different environments. At the Atlantic coast of southern Spain near
covering wide areas of the harbour. GPR data indicate the variable thickness of tsunamigenic layers, channel-like structures of backwash deposits, and a non-planar erosion basement. Abrasion-scours were detected in various places and boulder accumulations
at the base of the deposits were detected. The AA. show that shallow GPR is suitable for mapping tsunamites, though this method has certain limits and needs additional information for calibration.
Ground Penetrating Radar (GPR) is a shallow geophysical exploration technique based on the reflection of electromagnetic impulses. It gives a continuous image of the subsurface, like reflection seismics. The strong attenuation of radar waves in most
soils is a major limitation. Peat however has very favourable electrical characteristics resulting in low attenuation and excellent results are obtained from GPR surveys. Several examples Southern Belgium are discussed showing the wide range of possible
Soil pipes are common and important features of many catchments, particularly in semi-arid and humid areas, and can contribute a large proportion of runoff to river systems. Ground Penetrating Radar (GPR) has been used for non-destructive
identification and mapping of soil pipes in blanket peat catchments. This paper presents results from an experiment to test the ability of GPR to establish hydrological connectivity between pipes through use of a tracer solution.
Effondrement ; Finlande ; Finlande du Nord-Ouest ; GPR ; Géophysique ; Milieu humide ; Modèle ; Palse ; Pergélisol ; Réchauffement climatique ; Température du sol ; Thermodynamique ; Zone froide
conditions in the study area allow sustainable palsa development. A ground penetrating radar (GPR) survey of the palsa under both winter and summer conditions revealed its internal structure and the size of its frozen core. GPR imaging in summer detected
the upper peat/core boundary, and imaging in winter detected a deep reflector that probably represents the lower core boundary. This indicates that only a combined summer and winter GPR survey completely reveals the lateral and vertical extent of the frozen
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
GPR and aerial surveys were conducted to study changes of channel pattern in the lower course of the Obra River (western Poland). A 3D analysis of the GPR data supported with lithologic information indicated traces of a multi-channel pattern
of the channels inferred from GPR could be discerned. Analysis of historical maps from the eighteenth and the nineteenth centuries showed that 250 years ago the Obra was a meandering river. The maps illustrate also several meander cutoffs and decreased wetlands
investigations in permafrost regions demonstrate that ground-penetrating radar (GPR) offers an effective way to measure these parameters at a scale appropriate for many process and geotechnical studies. The AA. discuss the fundamental properties of GPR and how
High-resolution seismic and ground-penetrating-radar (GPR) data have been acquired over Lake Nikolay in the western Lena Delta in order to study the uppermost basin fill and the bordering frozen margins. GPR measurements were completed on the frozen
The AA. present new geological and geophysical data from various surveys, including a ground-penetrating radar (GPR) study, several marine shallow-seismic high-resolution surveys, and onshore and marine borehole data. The GPR data has revealed both