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Artículos de revistas sobre el tema "Radar facies"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 26 de abril de 2022

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1

Lejzerowicz, Anna, Sebastian Kowalczyk, and Anna Wysocka. "The usefulness of ground-penetrating radar images for the research of a large sand-bed braided river: case study from the Vistula River (central Poland)." Geologos 20, no. 1 (2014): 35–47. http://dx.doi.org/10.2478/logos-2014-0003.

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Abstract Ground-penetrating radar (GPR) surveys and sedimentological outcrop analyses were combined in order to determine the reflection patterns and internal architecture of terrace deposits of the Vistula River at Kępa Zawadowska in the southern part of Warsaw (central Poland). The sedimentary analyses concerned the granulometric composition and lithofacies analysis. The 34 GPR profiles, which were obtained in two outcrops, using a Malå RAMAC/GPR system with 500-MHz and 250-MHz shielded antennas, were up to 100 m long. The most characteristic ground-penetrating radar profiles are presented;
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2

Van Dam, R. L. "Internal structure and development of an aeolian river dune in The Netherlands, using 3-D interpretation of ground-penetrating radar data." Netherlands Journal of Geosciences - Geologie en Mijnbouw 81, no. 1 (2002): 27–37. http://dx.doi.org/10.1017/s0016774600020540.

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AbstractGround-penetrating radar data from a regular grid are used to study the internal structure and development of a 9-m high aeolian river dune in the Dutch Rhine-Meuse delta. The purpose of this investigation was to image the internal sedimentary structures to better understand the development of these aeolian river dunes. Three radar facies can be recognised in the GPR sections. Radar facies 1 has a maximum thickness of 5 to 6 m and is characterised by dipping, parallel reflections with a maximum length of at least 20 m. The reflections from perpendicular sections, analysed using closed-
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3

Bakker, M. A. J., D. Maljers, and H. J. T. Weerts. "Ground-penetrating radar profiling on embanked floodplains." Netherlands Journal of Geosciences - Geologie en Mijnbouw 86, no. 1 (2007): 55–61. http://dx.doi.org/10.1017/s0016774600021314.

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AbstractManagement of the Dutch embanked floodplains is of crucial interest in the light of a likely increase of extreme floods. One of the issues is a gradual decrease of floodwater accommodation space as a result of overbank deposition of mud and sand during floods. To address this issue, sediment deposits of an undisturbed embanked floodplain near Winssen along the river Waal were studied using ground-penetrating radar (GPR). A number of radar facies units were recognized. Boreholes were used to relate radar facies units to sedimentary facies and to determine radar velocity. The GPR groundw
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4

Jol, Harry M., and Derald G. Smith. "Ground penetrating radar of northern lacustrine deltas." Canadian Journal of Earth Sciences 28, no. 12 (1991): 1939–47. http://dx.doi.org/10.1139/e91-175.

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Ground penetrating radar (GPR) was used in several selected deltaic sedimentary environments to better understand subsurface stratigraphy and reconstruct former depositional environments. The profiles provide high-resolution, continuous subsurface data on facies thickness and depths, orientation of major sedimentary structures, postdepositional failure planes, and depth of peat deposits.Field experiments were carried out on six river deltas. Records from four of the deltas exhibit sedimentary facies; a record from one delta shows a possible slump; and records from another delta reveal the thic
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5

Budiono, Kris. "THE IMAGES OF SUBSURFACE TERTIARY – QUARTENARY DEPOSITS BASED ON GROUND PENETRATING RADAR RECORDS OF SUBI KECIL ISLAND COAST, NATUNA DISTRICT, RIAU ARCHIPELAGO PROVINCE." BULLETIN OF THE MARINE GEOLOGY 28, no. 1 (2016): 31. http://dx.doi.org/10.32693/bomg.28.1.2013.53.

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Subsurface Tertiary to Quaternary deposits from coast of Subi Kecil Island, Natuna Distric, Riau Archipelago Province, were imaged with Ground Penetrating Radar (GPR). The GPR survey was carried out by using GSSI Surveyor III/20 with 270 MHz and 40 MHz of 3200 MLF antennas. GPR data were processed using software GSSI’s RADAN for Windows NT™. The interpretation were done by using the radar facies as a groups of radar reflections. The GPR images of study area can be recoqnized in to several facies such as parallel, sub parallel, chaotic, oblique, mound and reflection-free. The calibration we
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6

Hawley, Robert L., Ola Brandt, Thorben Dunse, et al. "Using airborne Ku-band altimeter waveforms to investigate winter accumulation and glacier facies on Austfonna, Svalbard." Journal of Glaciology 59, no. 217 (2013): 893–99. http://dx.doi.org/10.3189/2013jog13j051.

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AbstractWinter balance is an important metric for assessing the change on glaciers and ice caps, yet measuring it using ground-based techniques can be challenging. We use the European Space Agency prototype Airborne SAR/Interferometric Radar Altimeter System (ASIRAS) to extract snow depths from the received altimeter waveforms over Austfonna ice cap, Svalbard. Additionally, we attempt to distinguish the long-term firn area from other glacier facies. We validate our results using snow depth and glacier facies characterizations determined from ground-based radar profiles, snow pits and a multi-l
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7

Tamura, Larissa Natsumi, Renato Paes de Almeida, Fabio Taioli, André Marconato, and Liliane Janikian. "Ground Penetrating Radar investigation of depositional architecture: the São Sebastião and Marizal formations in the Cretaceous Tucano Basin (Northeastern Brazil)." Brazilian Journal of Geology 46, no. 1 (2016): 15–27. http://dx.doi.org/10.1590/2317-4889201620150031.

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ABSTRACT: One key factor for the advance in the study of fluvial deposits is the application of geophysical methods, being the Ground Penetrating Radar one of special value. Although applied to active rivers, the method is not extensively tested on the rock record, bearing interest for hydrocarbon reservoir analogue models. The São Sebastião and Marizal formations were the subject of previous studies, which made possible the comparison of Ground Penetrating Radar survey to previous stratigraphic studies in order to identify the best combination of resolution, penetration and antenna frequency
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8

Huggenberger, Peter. "Radar facies: recognition of facies patterns and heterogeneities within Pleistocene Rhine gravels, NE Switzerland." Geological Society, London, Special Publications 75, no. 1 (1993): 163–76. http://dx.doi.org/10.1144/gsl.sp.1993.075.01.10.

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9

Moysey, Stephen, Rosemary J. Knight, and Harry M. Jol. "Texture-based classification of ground-penetrating radar images." GEOPHYSICS 71, no. 6 (2006): K111—K118. http://dx.doi.org/10.1190/1.2356114.

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Image texture is one of the key features used for the interpretation of radar facies in ground-penetrating radar (GPR) data. Establishing quantitative measures of texture is therefore a critical step in the effective development of advanced techniques for the interpretation of GPR images. This study presents the first effort to evaluate whether different measures of a GPR image capture the features of the data that, when coupled with a neural network classifier, are able to reproduce a human interpretation. The measures compared in this study are instantaneous amplitude and frequency, as well
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10

Ribolini, Adriano, Duccio Bertoni, Monica Bini, and Giovanni Sarti. "Ground-Penetrating Radar Prospections to Image the Inner Structure of Coastal Dunes at Sites Characterized by Erosion and Accretion (Northern Tuscany, Italy)." Applied Sciences 11, no. 23 (2021): 11260. http://dx.doi.org/10.3390/app112311260.

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In this study we aimed to gain insights into dune formation and evolution from select coastal tracts of Northern Tuscany by inspecting their internal sedimentary architecture with Ground-Penetrating Radar (GPR) analysis. Erosion, equilibrium and accretion characterize the selected coastal tracts, and this analysis remarks on some GPR features consistently associated with specific coastal evolution states. A standard sequence of data processing made it possible to trace several radar surfaces and reflectors in the GPR profile, eventually interpreted in terms of depositional processes and erosiv
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11

Staggs, Julie G., Roger Adams Young, and Roger M. Slatt. "Ground-penetrating radar facies characterization of deepwater turbidite outcrops." Leading Edge 22, no. 9 (2003): 888–91. http://dx.doi.org/10.1190/1.1614163.

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12

Moysey, S., J. Caers, R. Knight, and R. M. Allen-King. "Stochastic estimation of facies using ground penetrating radar data." Stochastic Environmental Research and Risk Assessment (SERRA) 17, no. 5 (2003): 306–18. http://dx.doi.org/10.1007/s00477-003-0152-6.

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13

Menezes, Paulo T. L., Jandyr M. Travassos, Marco A. M. Medeiros, and Patricia Takayama. "High-resolution facies modeling of presalt lacustrine carbonates reservoir analog: Morro do Chaves Formation example, Sergipe-Alagoas Basin, Brazil." Interpretation 4, no. 2 (2016): SE63—SE74. http://dx.doi.org/10.1190/int-2014-0213.1.

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Barremian lacustrine carbonates, mainly coquinas, are the reservoir rocks of the large presalt petroleum discoveries in deep to ultradeepwaters, at the southeast Brazilian margin, namely, the Santos, Campos, and Espirito Santo Basins. The complex geologic setting of those discoveries, with massive overburden of salt bodies, makes the seismic imaging of the carbonate reservoirs an expensive and challenging issue. In this setting, accurate facies models are a requirement to the predictability of the carbonate reservoir intervals. We have developed an analog high-resolution coquinas facies model
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14

Bindschadler, R. A., and P. L. Vornberger. "Determination Of Snow Facies and Ice Velocity Using Synthetic Aperture Radar Imagery." Annals of Glaciology 14 (1990): 330. http://dx.doi.org/10.1017/s0260305500008880.

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The properties of synthetic aperture radar (SAR) imagery are appropriate for its use to map snow facies. These facies, defined by Benson (1962), are subdivisions of the accumulation area of an ice sheet or polar glacier and represent the interaction of the ice mass with the climate through the processes of snow accumulation and melting. Changes in these climatic parameters are expected to cause changes in the extent and character of these facies. The ability of SAR to discriminate these facies is due to the significant amount of sub-surface volume scattering in the measured radar backscatter s
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15

Bindschadler, R. A., and P. L. Vornberger. "Determination Of Snow Facies and Ice Velocity Using Synthetic Aperture Radar Imagery." Annals of Glaciology 14 (1990): 330. http://dx.doi.org/10.3189/s0260305500008880.

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The properties of synthetic aperture radar (SAR) imagery are appropriate for its use to map snow facies. These facies, defined by Benson (1962), are subdivisions of the accumulation area of an ice sheet or polar glacier and represent the interaction of the ice mass with the climate through the processes of snow accumulation and melting. Changes in these climatic parameters are expected to cause changes in the extent and character of these facies. The ability of SAR to discriminate these facies is due to the significant amount of sub-surface volume scattering in the measured radar backscatter s
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16

van Overmeeren, R. A. "Radar facies of unconsolidated sediments in The Netherlands: A radar stratigraphy interpretation method for hydrogeology." Journal of Applied Geophysics 40, no. 1-3 (1998): 1–18. http://dx.doi.org/10.1016/s0926-9851(97)00033-5.

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17

Fedorova, Larisa, Anna Lejzerowicz, Gavril Kulyandin, Denis Savvin, and Maksim Fedorov. "Ground penetrating radar investigations of the geological structure of loose sediments at solid mineral deposits." E3S Web of Conferences 192 (2020): 04005. http://dx.doi.org/10.1051/e3sconf/202019204005.

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For effective commercial development of deposits, an increase in the information content of operational exploration is required. In recent years, the range of methods used to obtain complete and reliable information about the structure and properties of the rock mass of a developed field include remote methods of high-frequency electrical prospecting, in particular, the ground penetrating radar (GPR) method. The paper presents a methodological experience in the interpretation of GPR data of sandy river sediments based on the identification of radar facies. In the considered area, four types of
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18

Partington, K. C. "Discrimination of glacier facies using multi-temporal SAR data." Journal of Glaciology 44, no. 146 (1998): 42–53. http://dx.doi.org/10.3189/s0022143000002331.

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AbstractGlacier facies from the Greenland ice sheet and the Wrangell-St Elias Mountains, Alaska, are analyzed using multi-temporal synthetic aperture radar (SAR) data from the European Space Agency ERS-1 satellite. Distinct zones and facies are visible in multi-temporal SAR data, including the dry-snow facies, the combined percolation and wet-snow facies, the ice facies, transient melt areas and moraine. In Greenland and south-central Alaska, very similar multi-temporal signatures are evident for the same facies, although these facies are found at lower altitude in West Greenland where the equ
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19

Partington, K. C. "Discrimination of glacier facies using multi-temporal SAR data." Journal of Glaciology 44, no. 146 (1998): 42–53. http://dx.doi.org/10.1017/s0022143000002331.

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AbstractGlacier facies from the Greenland ice sheet and the Wrangell-St Elias Mountains, Alaska, are analyzed using multi-temporal synthetic aperture radar (SAR) data from the European Space Agency ERS-1 satellite. Distinct zones and facies are visible in multi-temporal SAR data, including the dry-snow facies, the combined percolation and wet-snow facies, the ice facies, transient melt areas and moraine. In Greenland and south-central Alaska, very similar multi-temporal signatures are evident for the same facies, although these facies are found at lower altitude in West Greenland where the equ
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20

Hickin, Edward J. "Fluvial facies models: a review of Canadian research." Progress in Physical Geography: Earth and Environment 17, no. 2 (1993): 205–22. http://dx.doi.org/10.1177/030913339301700207.

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Canadian river scientists made significant contributions to the early development (1960-80) of fluvial facies models, particularly to those for braided rivers. More recent Canadian studies (1980-92) have centred on understanding the facies sedimentology of anastomosed and wandering gravel-bed rivers. River planform facies models are distinctly limited as indicators of fluvial style because of: (1) spurious environmental correlations; (2) the difficulty of river planform definition; (3) differential preservation potential of facies; (4) inadequate and unsystematic field sampling; (5) flawed sta
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21

Heteren, Sytze Van, Duncan M. Fitzgerald, Paul A. Mckinlay, and Ilya V. Buynevich. "Radar facies of paraglacial barrier systems: coastal New England, USA." Sedimentology 45, no. 1 (1998): 181–200. http://dx.doi.org/10.1046/j.1365-3091.1998.00150.x.

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22

BRISTOW, CHARLIE. "Facies analysis in the Lower Greensand using ground-penetrating radar." Journal of the Geological Society 152, no. 4 (1995): 591–98. http://dx.doi.org/10.1144/gsjgs.152.4.0591.

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23

Yue, Dali, Wei Li, Wurong Wang, et al. "Analyzing the architecture of point bar of meandering fluvial river using ground penetration radar: A case study from Hulun Lake Depression, China." Interpretation 7, no. 2 (2019): T437—T454. http://dx.doi.org/10.1190/int-2018-0144.1.

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The point bar is one of the most important reservoirs in a meandering depositional system, and accurately building a 3D architecture model for point bars is crucial to predict hydrocarbon distribution within the reservoir. Unfortunately, we can only obtain a qualitative description about the internal architecture of the point bar due to the limited information or the low resolution of available data (such as reflection seismic data). To build a 3D prototype point bar reservoir model, we analyze the architecture of point bars by integrating high-resolution ground penetrating radar (GPR) data an
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24

Brown, Joel, Joel Harper, W. Tad Pfeffer, Neil Humphrey, and John Bradford. "High-resolution study of layering within the percolation and soaked facies of the Greenland ice sheet." Annals of Glaciology 52, no. 59 (2011): 35–42. http://dx.doi.org/10.3189/172756411799096286.

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AbstractWithin the percolation and soaked facies of the Greenland ice sheet, the relationship between radar-derived internal reflection horizons and the layered structure of the firn column is unclear. We conducted two small-scale ground-penetrating radar (GPR) surveys in conjunction with 10 m firn cores that we collected within the percolation and soaked facies of the Greenland ice sheet. The two surveys were separated by a distance of ~50 km and ~340m of elevation leading to ~40 days of difference in the duration of average annual melt. At the higher site (~1997ma.s.l.), which receives less
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25

Miller, Julie Z., Riley Culberg, David G. Long, Christopher A. Shuman, Dustin M. Schroeder, and Mary J. Brodzik. "An empirical algorithm to map perennial firn aquifers and ice slabs within the Greenland Ice Sheet using satellite L-band microwave radiometry." Cryosphere 16, no. 1 (2022): 103–25. http://dx.doi.org/10.5194/tc-16-103-2022.

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Abstract. Perennial firn aquifers are subsurface meltwater reservoirs consisting of a meters-thick water-saturated firn layer that can form on spatial scales as large as tens of kilometers. They have been observed within the percolation facies of glaciated regions experiencing intense seasonal surface melting and high snow accumulation. Widespread perennial firn aquifers have been identified within the Greenland Ice Sheet (GrIS) via field expeditions, airborne ice-penetrating radar surveys, and satellite microwave sensors. In contrast, ice slabs are nearly continuous ice layers that can also f
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26

Mahmood, Ahmed, Surendra Parashar, and Satish Srivastava. "RADARSAT data applications: radar backscatter of granitic facies, the Zaer pluton, Morocco." Journal of Geochemical Exploration 66, no. 1-2 (1999): 413–20. http://dx.doi.org/10.1016/s0375-6742(99)00009-6.

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27

Zabel, I. H. H., K. C. Jezek, P. A. Baggeroer, and S. P. Gogineni. "Ground-based radar observations of snow stratigraphy and melt processes in the percolation facies of the Greenland ice sheet." Annals of Glaciology 21 (1995): 40–44. http://dx.doi.org/10.1017/s0260305500015573.

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Summer melt is a primary source of mass loss on the Greenland ice sheet. An understanding of melt processes on the ice sheet, their connection with atmospheric processes, and the redistribution of meltwater is important for ascertaining the mass balance of the ice sheet. High-resolution radar measurements made in the percolation zone of the Greenland ice sheet reveal the evolving radar signature of summer surface melting and subsequent refreezing of meltwater. A traverse over the snow surface has resulted in the first radar map of snow stratigraphy over an extended distance. The dominant sourc
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28

Zabel, I. H. H., K. C. Jezek, P. A. Baggeroer, and S. P. Gogineni. "Ground-based radar observations of snow stratigraphy and melt processes in the percolation facies of the Greenland ice sheet." Annals of Glaciology 21 (1995): 40–44. http://dx.doi.org/10.3189/s0260305500015573.

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Summer melt is a primary source of mass loss on the Greenland ice sheet. An understanding of melt processes on the ice sheet, their connection with atmospheric processes, and the redistribution of meltwater is important for ascertaining the mass balance of the ice sheet. High-resolution radar measurements made in the percolation zone of the Greenland ice sheet reveal the evolving radar signature of summer surface melting and subsequent refreezing of meltwater. A traverse over the snow surface has resulted in the first radar map of snow stratigraphy over an extended distance. The dominant sourc
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29

Ékes, Csaba, and Edward J. Hickin. "Ground penetrating radar facies of the paraglacial Cheekye Fan, southwestern British Columbia, Canada." Sedimentary Geology 143, no. 3-4 (2001): 199–217. http://dx.doi.org/10.1016/s0037-0738(01)00059-8.

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30

Munk, J., K. C. Jezek, R. R. Forster, and S. P. Gogineni. "An accumulation map for the Greenland dry-snow facies derived from spaceborne radar." Journal of Geophysical Research: Atmospheres 108, no. D9 (2003): n/a. http://dx.doi.org/10.1029/2002jd002481.

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31

Long, David G., and Mark R. Drinkwater. "Greenland ice-sheet surface properties observed by the Seasat-A scatterometer at enhanced resolution." Journal of Glaciology 40, no. 135 (1994): 213–30. http://dx.doi.org/10.1017/s0022143000007310.

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AbstractFor 3 months in 1978, the 14.6 GHz Seasat-A scatterometer (SASS) measured the normalized microwave-radar back-scatter coefficient of the Earth’s surface for the purpose of estimating near-surface vector winds over the ocean. SASS also made back-scatter measurements over land and ice regions; however, the application of this data has been limited due to the low (50 km) resolution of the measurements. Using a new technique for generating 6 km enhanced-resolution SASS images of the radar back-scatter characteristics, we present a study of the 1978 condition of the Greenland ice sheet. We
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32

Long, David G., and Mark R. Drinkwater. "Greenland ice-sheet surface properties observed by the Seasat-A scatterometer at enhanced resolution." Journal of Glaciology 40, no. 135 (1994): 213–30. http://dx.doi.org/10.3189/s0022143000007310.

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AbstractFor 3 months in 1978, the 14.6 GHz Seasat-A scatterometer (SASS) measured the normalized microwave-radar back-scatter coefficient of the Earth’s surface for the purpose of estimating near-surface vector winds over the ocean. SASS also made back-scatter measurements over land and ice regions; however, the application of this data has been limited due to the low (50 km) resolution of the measurements. Using a new technique for generating 6 km enhanced-resolution SASS images of the radar back-scatter characteristics, we present a study of the 1978 condition of the Greenland ice sheet. We
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33

Sheng, Yongwei, Laurence C. Smith, Karen E. Frey, and Douglas E. Alsdorf. "A high temporal resolution data set of ERS scatterometer radar backscatter for research in Arctic and sub-Arctic regions." Polar Record 38, no. 205 (2002): 115–20. http://dx.doi.org/10.1017/s0032247400017502.

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AbstractRadar backscatter in Arctic and sub-Arctic regions is temporally dynamic and reflects changes in sea ice, glacier facies, soil thaw state, vegetation cover, and moisture content. Wind scatterometers on the ERS-1 and ERS-2 satellites have amassed a global archive of C-band radar backscatter data since 1991. This paper derives three high temporal resolution data products from this archive that are designed to facilitate scatterometer research in high-latitude environments. Radar backscatter data have a grid spacing of 25 km and are mapped northwards from 60°N latitude over intervals of o
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34

Pribyl, Paul, and Bryan N. Shuman. "A computational approach to Quaternary lake-level reconstruction applied in the central Rocky Mountains, Wyoming, USA." Quaternary Research 82, no. 1 (2014): 249–59. http://dx.doi.org/10.1016/j.yqres.2014.01.012.

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AbstractSediment-based reconstructions of late-Quaternary lake levels provide direct evidence of hydrologic responses to climate change, but many studies only provide approximate lake-elevation curves. Here, we demonstrate a new method for producing quantitative time series of lake elevation based on the facies and elevations of multiple cores collected from a lake's margin. The approach determines the facies represented in each core using diagnostic data, such as sand content, and then compares the results across cores to determine the elevation of the littoral zone over time. By applying the
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35

McMechan, George A., Robert G. Loucks, Paul Mescher, and Xiaoxian Zeng. "Characterization of a coalesced, collapsed paleocave reservoir analog using GPR and well‐core data." GEOPHYSICS 67, no. 4 (2002): 1148–58. http://dx.doi.org/10.1190/1.1500376.

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The three‐dimensional architecture, spatial complexity, and pore‐type distribution are mapped in a near‐surface analog of a coalesced, collapsed paleocave system in the Lower Ordovician Ellenburger Group near the city of Marble Falls in central Texas. The surface area of the site has dimensions of about 350 × 1000 m. The data collected include about 12 km of 50‐MHz ground‐penetrating radar (GPR) data arranged in a grid of orthogonal lines, 29 cores of about 15‐m length, and detailed facies maps of an adjacent quarry face. Electrical property measurements along with detailed core descriptions w
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36

Tercier, Paulette, Rosemary Knight, and Harry Jol. "A comparison of the correlation structure in GPR images of deltaic and barrier‐spit depositional environments." GEOPHYSICS 65, no. 4 (2000): 1142–53. http://dx.doi.org/10.1190/1.1444807.

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We have used geostatistical analysis of radar reflections to quantify the correlation structures found in 2-D ground‐penetrating radar (GPR) images. We find that the experimental semivariogram, the product of the geostatistical analysis of the GPR data, is well‐defined and can be modeled using standard geostatistical models to obtain an estimate of the range or correlation length, and the maximum correlation direction, in the 2-D GPR image. When we compare the results from geostatistical analysis of GPR data from selected deltaic and barrier‐spit depositional environments we find different cor
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37

Everett, Mark E., Timothy S. DeSmet, Robert R. Warden, Henry A. Ruiz-Guzman, Peter Gavette, and Jason Hagin. "The Fortress Beneath: Ground Penetrating Radar Imaging of the Citadel at Alcatraz: 1. A Guide for Interpretation." Heritage 4, no. 3 (2021): 1328–47. http://dx.doi.org/10.3390/heritage4030072.

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Ground-penetrating radar has emerged as a prominent non-destructive evaluation tool for the study of inaccessible subsurface elements of cultural heritage structures. Often of central interest is the desire to image the remains of a pre-existing historic structure that is located directly beneath a more recently built one. The interpretation of GPR images in such cases is usually difficult due to ambiguities caused by the presence of pervasive clutter, environmental noise, and overlapping target signatures. Sites with abundant ground truth allow for more confident interpretations and serve as
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38

Cooper, Matthew, and Laurence Smith. "Satellite Remote Sensing of the Greenland Ice Sheet Ablation Zone: A Review." Remote Sensing 11, no. 20 (2019): 2405. http://dx.doi.org/10.3390/rs11202405.

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The Greenland Ice Sheet is now the largest land ice contributor to global sea level rise, largely driven by increased surface meltwater runoff from the ablation zone, i.e., areas of the ice sheet where annual mass losses exceed gains. This small but critically important area of the ice sheet has expanded in size by ~50% since the early 1960s, and satellite remote sensing is a powerful tool for monitoring the physical processes that influence its surface mass balance. This review synthesizes key remote sensing methods and scientific findings from satellite remote sensing of the Greenland Ice Sh
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39

Roberts, M. C., H. P. Niller, and N. Helmstetter. "Sedimentary architecture and radar facies of a fan delta, Cypress Creek, West Vancouver, British Columbia." Geological Society, London, Special Publications 211, no. 1 (2003): 111–26. http://dx.doi.org/10.1144/gsl.sp.2001.211.01.10.

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40

Ziekur, Regine, Gösta Hoffmann, and Thomas Grelle. "Facies architecture of the subsurface of the Holocene coastal lowlands on the SW Baltic Sea (Germany) insights from ground penetrating radar surveys." Zeitschrift der Deutschen Gesellschaft für Geowissenschaften 160, no. 1 (2009): 79–91. http://dx.doi.org/10.1127/1860-1804/2009/0160-0079.

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41

Isla, Manuel F., Ernesto Schwarz, and Gonzalo D. Veiga. "Record of a nonbarred clastic shoreline." Geology 48, no. 4 (2020): 338–42. http://dx.doi.org/10.1130/g46800.1.

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Abstract The morphology of wave-dominated clastic shorelines (i.e., foreshore and upper-shoreface sediments) can vary from barred to nonbarred, though the ancient record of nonbarred, sand-dominated shorelines has yet to be recognized. Here, a facies and quantitative architectural analysis of a clastic succession characterized by sandy inclined beds is presented and interpreted as the record of a high-gradient, nonbarred shoreline. Inclined beds dip seaward, have a tangential geometry (<3 m height, <40 m length, <11° dip), and are composed of planar lamination along the fo
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42

Clement, William P., Warren Barrash, and Michael D. Knoll. "Reflectivity modeling of a ground-penetrating-radar profile of a saturated fluvial formation." GEOPHYSICS 71, no. 3 (2006): K59—K66. http://dx.doi.org/10.1190/1.2194528.

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Major horizons in radar reflection profiles may correlate with contacts between stratigraphic units or with structural breaks such as fault surfaces. Minor reflections may be caused by clutter or, in some cases, may indicate material properties or structure within stratigraphic units. In this study, we examine the physical basis for major and minor reflections observed in a shallow, unconfined, fluvial aquifer near Boise, Idaho, U. S. A. We compare a 2D profile from a surface ground-penetrating-radar reflection transect with the 1D modeled reflection profiles at three wells adjacent to the sur
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43

Johannessen, Peter N., Lars Henrik Nielsen, Lars Nielsen, et al. "Sedimentary facies and architecture of the Holocene to Recent Rømø barrier island in the Danish Wadden Sea." Geological Survey of Denmark and Greenland (GEUS) Bulletin 15 (July 10, 2008): 49–52. http://dx.doi.org/10.34194/geusb.v15.5042.

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This paper describes an ongoing multidisciplinary study on the development of the barrier islands in the Danish Wadden Sea (Vadehavet), carried out by the Department of Geography and Geology at the University of Copenhagen and the Geolo gical Survey of Denmark and Greenland (GEUS). Nine sediment cores each c. 25 m long and a total of c. 45 km ground penetrating radar (GPR) profiles have been acquired on the islands of Rømø and Fanø. Geochemical and palaeontological analyses and dating of 150 core samples using optically stimulated luminescence (OSL) are in progress. This multidisciplinary appr
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44

Ross, Neil, Hugh Corr, and Martin Siegert. "Large-scale englacial folding and deep-ice stratigraphy within the West Antarctic Ice Sheet." Cryosphere 14, no. 6 (2020): 2103–14. http://dx.doi.org/10.5194/tc-14-2103-2020.

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Abstract. It has been hypothesized that complex englacial structures identified within the East Antarctic and Greenland ice sheets are generated by (i) water freezing to the ice sheet base and evolving under ice flow, (ii) deformation of ice of varying rheology, or (iii) entrainment of basal material. Using ice-penetrating radar, we identify a widespread complex of deep-ice facies in West Antarctica that exist in the absence of basal water. These deep-ice units are extensive, thick (>500 m), and incorporate multiple highly reflective englacial layers. At the lateral margin of an enhanced fl
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45

Fahnestock, Mark A., and Robert A. Bindschadler. "Description of a program for SAR investigation of the Greenland ice sheet and an example of margin change detection using SAR." Annals of Glaciology 17 (1993): 332–36. http://dx.doi.org/10.1017/s0260305500013069.

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In order to interpret changes in the Greenland ice sheet as indications of climatic variation, it is necessary to place observations of local changes in a regional context. This requires a comprehensive monitoring effort which addresses both the inland ice and changes in the ice margin. This paper describes the design of a program for regional investigation of the Greenland ice sheet using synthetic aperture radar (SAR), and discusses the utility of SAR data for detection of change in the ice sheet margin. Comprehensive coverage of the Greenland ice sheet by ERS-1 SAR will allow us to map the
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46

Fahnestock, Mark A., and Robert A. Bindschadler. "Description of a program for SAR investigation of the Greenland ice sheet and an example of margin change detection using SAR." Annals of Glaciology 17 (1993): 332–36. http://dx.doi.org/10.3189/s0260305500013069.

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In order to interpret changes in the Greenland ice sheet as indications of climatic variation, it is necessary to place observations of local changes in a regional context. This requires a comprehensive monitoring effort which addresses both the inland ice and changes in the ice margin. This paper describes the design of a program for regional investigation of the Greenland ice sheet using synthetic aperture radar (SAR), and discusses the utility of SAR data for detection of change in the ice sheet margin.Comprehensive coverage of the Greenland ice sheet by ERS-1 SAR will allow us to map the b
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47

Tronicke, Jens, and Niklas Allroggen. "Toward automated delineation of ground-penetrating radar facies in clastic sediments: An example from stratified glaciofluvial deposits." GEOPHYSICS 80, no. 4 (2015): A89—A94. http://dx.doi.org/10.1190/geo2015-0188.1.

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48

Møller, Ingelise, and Henrik Vosgerau. "Testing ground-penetrating radar for resolving facies architecture changes - a radar stratigraphic and sedimentological analysis along a 30 km profile on the Karup Outwash Plain, Denmark." Near Surface Geophysics 4, no. 1 (2005): 57–68. http://dx.doi.org/10.3997/1873-0604.2005032.

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49

Jezek, K. C., M. R. Drinkwater, J. P. Crawford, R. Bindschadler, and R. Kwok. "Analysis of synthetic aperture radar Data collected over the southwestern Greenland ice sheet." Journal of Glaciology 39, no. 131 (1993): 119–32. http://dx.doi.org/10.1017/s002214300001577x.

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AbstractAnalyses of the first aircraft multi-frequency, Polarimetric synthetic aperture radar (SAR) data acquired over the southwestern Greenland ice sheet are presented. Data were collected on 31 August 1989 by the Jet Propulsion Laboratory SAR using the NASA DC-8 aircraft. Along with curvilinear patterns associated with large-scale morphologic features such as crevasses, lakes and streams, frequency and polarization dependencies are observed in the P-, L-and C-band image products. Model calculations that include firn grain-size and volumetric water content suggest that tonal variations in an
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50

Jezek, K. C., M. R. Drinkwater, J. P. Crawford, R. Bindschadler, and R. Kwok. "Analysis of synthetic aperture radar Data collected over the southwestern Greenland ice sheet." Journal of Glaciology 39, no. 131 (1993): 119–32. http://dx.doi.org/10.3189/s002214300001577x.

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AbstractAnalyses of the first aircraft multi-frequency, Polarimetric synthetic aperture radar (SAR) data acquired over the southwestern Greenland ice sheet are presented. Data were collected on 31 August 1989 by the Jet Propulsion Laboratory SAR using the NASA DC-8 aircraft. Along with curvilinear patterns associated with large-scale morphologic features such as crevasses, lakes and streams, frequency and polarization dependencies are observed in the P-, L-and C-band image products. Model calculations that include firn grain-size and volumetric water content suggest that tonal variations in an
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