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    Wyświetlanie 1-11 z 11
    Tytuł:
    Unknown Ancient Funerary Structures Discovered in West Saqqara (Egypt) Using Ground-Penetrating Radar (GPR)
    Autorzy:
    Welc, Fabian
    Mieszkowski, Radosław
    Powiązania:
    https://bibliotekanauki.pl/articles/484148.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Kultur Śródziemnomorskich i Orientalnych PAN
    Tematy:
    ground-penetrating radar (GPR)
    funerary architecture
    Saqqara
    Old Kingdom Egypt
    Opis:
    The ground-penetrating radar (GPR) survey conducted in the south-eastern part of the Polish archaeological concession in West Saqqara confirmed the high usability of the GPR method in non-invasive prospecting of desert archaeological sites. The survey has allowed to confirm the location of one and the discovery of two so far unknown funerary structures characterized by significantly large dimensions. Analysis of the reflection profiles allow to conclude that these anomalies are generated by rock-hewn burial shafts. Only one of these tombs can be dated with high confidence to the end of the Old Kingdom. Precise determination of the chronology of the two other structures is not possible without archaeological verification.
    Źródło:
    Études et Travaux (Institut des Cultures Méditerranéennes et Orientales de l’Académie Polonaise des Sciences); 2015, 28; 201-215
    2084-6762
    2449-9579
    Pojawia się w:
    Études et Travaux (Institut des Cultures Méditerranéennes et Orientales de l’Académie Polonaise des Sciences)
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Complex analysis of GPR signals for the delineation of subsurface subtle features
    Autorzy:
    Akinsunmade, Akinniyi
    Tomecka-Suchoń, Sylwia
    Pysz, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/184601.pdf
    Data publikacji:
    2019
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    Ground Penetrating Radar (GPR)
    electromagnetic energy
    signal attributes
    soil
    compaction
    Opis:
    In this paper, complex signal analyses of ground penetrating radar (GPR) field data over an area of farmland in Krakow were interpreted alongside the basic filtered field data. The farmland was simulated with varying degrees of soil compaction induced by tractor movement. The focus of the study was the delineation of inherent characteristics of media through which the electromagnetic energy travelled. Fourteen GPR profiles were acquired from the area. The field data were subjected to pre- and post-processing prior to its the presentation and interpretation. Advance analysis operations on the field data which resorted in different attributes reveal more about the effects of the compaction on the soil than indicated by the basic filtered field data. Better resolution of subsurface layers boundary and lateral variation in the physical properties of the traversing media were well elucidated. The results have demonstrated that an advanced signal processing such as used in the study has ability to depict subtle characteristics of the propagating media.
    Źródło:
    Geology, Geophysics and Environment; 2019, 45, 4; 257-267
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of geophysical surveys in the identification of water escape zones from retention lakes: a case study on a selected object in Upper Silesia
    Autorzy:
    Mieszkowski, Radosław
    Wójcik, Emilia
    Kozłowski, Mikołaj
    Popielski, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/2025248.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ground penetrating radar (GPR) method
    electrical resistivity tomography (ERT) method
    retention lake
    water reservoir
    Opis:
    The main scientific goal of this work is the presentation of the role of selected geophysical methods (Ground-Penetrating Radar GPR and Electrical Resistivity Tomography ERT) to identify water escape zones from retention reservoirs. The paper proposes a methodology of geophysical investigations for the identification of water escape zones from a retention fresh water lake (low mineralised water). The study was performed in a lake reservoir in Upper Silesia. Since a number of years the administrators of the lake have observed a decreasing water level, a phenomenon that is not related to the exploitation of the object. The analysed retention lake has a maximal depth between 6 and 10 m, depending on the season. It is located on Triassic carbonate rocks of the Muschelkalk facies. Geophysical surveys included measurements on the water surface using ground penetration radar (GPR) and electrical resistivity tomography (ERT) methods. The measurements were performed from watercrafts made of non-metal materials. The prospection reached a depth of about 1 to 5 m below the reservoir bottom. Due to large difficulties of conducting investigations in the lake, a fragment with an area of about 5,300 m2, where service activities and sealing works were already commenced, was selected for the geophysical survey. The scope of this work was: (1) field geophysical research (Ground-Penetrating Radar GPR and Electrical Resistivity Tomography ERT with geodesic service), (2) processing of the obtained geophysical research results, (3) modelling of GPR and ERT anomalies on a fractured water reservoir bottom, and (4) interpretation of the obtained results based on the modelled geophysical anomalies. The geophysical surveys allowed for distinguishing a zone with anomalous physical parameters in the area of the analysed part of the retention lake. ERT surveys have shown that the water escape zone from the reservoir was characterised by significantly decreased electrical resistivities. Diffraction hyperboles and a zone of wave attenuation were observed on the GPR images in the lake bottom within the water escape zone indicating cracks in the bottom of the water reservoir. The proposed methodology of geophysical surveys seems effective in solving untypical issues such as measurements on the water surface.
    Źródło:
    Studia Quaternaria; 2018, 35; 121-129
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Review on Impulse RADAR
    Autorzy:
    Kumar, Saket
    Kumar, Amit
    Singh, Vikrant
    Singh, Abhishek Kumar
    Powiązania:
    https://bibliotekanauki.pl/articles/2055207.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    radar
    impulse radar
    ground penetrating radar
    GPR
    Opis:
    RADAR plays a vital role in military applications since its origin in the 2nd world war. Recently it has been used in surface inception, health monitoring, infrastructure health monitoring, etc. In these applications, Ultra-wideband RADAR systems are more popular than traditional RADAR systems. Impulse RADAR is a special kind of ultra-wideband RADAR, which is mostly used for surface penetration, through-wall imaging, antimissile detection, anti-stealth technology, etc. because of its high resolution and low center frequency. Out of all these applications, impulse RADAR has been used intensively as a ground-penetrating RADAR for the detection of land mines, underlying pipelines, buried objects, etc. This report has attempted to provide the steps for designing the impulse ground penetrating RADAR (GPR) as well as provides the value of crucial parameters required in the design process of commercial GPR systems.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 4; 579--587
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coastal dune dynamics along the northern Curonian Spit, Lithuania : toward an integrated database
    Autorzy:
    Bitinas, A.
    Dobrotin, N.
    Buynevich, I. V.
    Molodkov, A.
    Damušytė, A.
    Pupienis, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060456.pdf
    Data publikacji:
    2018
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    palaeosols
    ground-penetrating radar
    GPR
    IR-OSL
    radiocarbon
    magnetic susceptibility
    Opis:
    Sand dunes are the most prominent subjects of geological and geomorphological interest along the Curonian Spit - a mega-barrier that separates the Curonian Lagoon from the Baltic Sea. To date, an assessment of various parameters of migrating dunes along the spit has been based on comparative analysis of old maps or aerial and satellite images, as well as geodetic measurements. These investigations have allowed assessment of dune dynamics over a relatively short historical period (~1700s to present). The most recent detailed investigations of the Dead (Grey) Dunes along the Lithuanian part of the spit using ground-penetrating radar (GPR) and magnetic susceptibility (MS) surveys, supported by a radiocarbon (14C) chronological framework of palaeosols and infrared optically stimulated luminescence (IR-OSL) ages of sand horizons, have advanced our understanding of aeolian landscape evolution. The interpretation of dune activity and stability phases has been generally based on IR-OSL dating results of the sand layers located between radiocarbon-dated palaeosols. However, the influence of soil-forming processes on the IR-OSL dating results related to possible migration of natural radioactive isotopes via aeolian sand layers has not been previously considered. Hypotheses of dune reactivation and migration caused by abrupt regional climate shifts, catastrophic forest fires, anthropogenic influence, and more local forcings have been tested. An integrated approach to dune investigations has offered an estimate of the rates of sand accumulation and key phases of aeolian dynamics during both stormy and calm periods, as well as helped to extend the record of dune evolution to the mid-Holocene. The palaeoenvironmental and palaeodynamic reconstructions of the Dead Dunes suggest that this mid-Holocene phase of dune activity was of a local character and likely did not exceed several centuries.
    Źródło:
    Geological Quarterly; 2018, 62, 3; 553--562
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface NMR survey on Hansbreen Glacier, Hornsund, SW Spitsbergen (Norway)
    Autorzy:
    Turu, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/295114.pdf
    Data publikacji:
    2012
    Wydawca:
    Stowarzyszenie Geomorfologów Polskich
    Tematy:
    Polythermal glacier
    Surface nuclear magnetic resonance sounding (MRS)
    GPR (Ground Penetrating Radar)
    englacial water content
    subglacial meltwater
    subglacial aquifers
    free water content
    Opis:
    Glaciers are widely spread on polar and sub-polar regions but also on middle latitude mountains, where cold-dry type glaciers, polythermal glaciers and temperate-wet glaciers are respectively present. Polythermal glaciers have a cold-ice layer (temperature below the pressure melting point) overriding a temperate-ice layer. Nineteen magneticc resonance soundings were done following a 3 Kmprofile on Hansbreen front. Resistivity on the glacier surface, magnetic susceptibility of rocks, electromagnetic noise and total earth's magnetic field measurements confirm that the MRS survey took place in the best conditions. MRS data show different signals amplitudes at the Larmor frequency according to the loop dimension. In a very high electrical resistive context (greater than 2 Mega Ohms meter for glacier ice) the surveyed depth is directly related to the loop area. For small loops (30msquare loop) amplitudes around 50 nV are common as well as some decay time (T*2) above 300 ms. Enlarging the loop size (60 m square loop) it is possible to observe a decrease of the signal amplitude at the Larmor frequency (E0 less than 20 nV) but also the time decay (100 ms greater than =T*2 greater than 40 ms). Increasing loop sizes (90 and 120msquare loops), a slight increase in amplitude at the Larmor frequency, close to 30 nV, is observed with very high time decays (T*2 greater than 500 ms). Ground Penetrating Radar surveys were carried out in Hansbreen at the same location as theMRSsurveyed zone. Available GPR data show a water content of 2,5% on the cold-ice layer (the first 35 m depth) and 2% of water content on the temperate- ice layer but a 4%of water content can also be detected. Both geophysical methods are not convergent because some water content on ice has too short relaxation times being undetectable with conventionalMRSdevices. In that sense the low T*2 time decays data from large MRS loops elucidates that at the temperate-ice layer water flows by seepage through veins and microfractures at a very low rate toward the glacier bottom and a large amount of free water is close to the cold/temperate transition surface. In the cold-ice layer large T*2 time decays are common because water flows through fissures or karstic like conduits. In summary, combining the MRS and GPR techniques gives glaciologists a powerful toolkit to elucidate water flow-paths on glaciers, supercooled meltwater content and subglacial water or aquifers.
    Źródło:
    Landform Analysis; 2012, 21; 57-74
    1429-799X
    Pojawia się w:
    Landform Analysis
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Feasibility analysis of using GPR method for the examination of post-glacial deposits in mountainous geological environment
    Analiza możliwości użycia metody GPR do badania utworów postglacjalnych w rejonach górskich
    Autorzy:
    Tomecka-Suchoń, S.
    Gołębiowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/183407.pdf
    Data publikacji:
    2011
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    GPR
    utwory postglacjalne
    osady czwartorzędowe
    ground penetrating radar
    post-glacjal sediments
    Quaternary deposits
    Opis:
    The Ground Penetrating Radar (GPR) measurements presented in this paper had two main objectives. The first was to analize the possibility of using GPR method in examination of sediments in a mountainous geological environment and the second objective was to assess the special distribution of post-glacial sediments and their thickness at a selected site. The experimental measurements were carried out on in the alp of Ornak in the western part of Tatra Mountains This article provides a brief theoretical analysis of possible use of the georadar method in post-glacial sediment examination. The results of GPR surveys done in the reflection profiling mode enable the distinction of zones with different amount of till, clay, sand, gravel and rock debris in the post-glacial sediments.
    Badania GPR prezentowane w artykule miały dwa cele: pierwszym było określenie możliwości zastosowania metody GPR do badania utworów osadowych w górskich warunkach geologicznych, a drugim - określenie przestrzennego rozkładu i miąższości utworów postglacjalnych w wybranym miejscu w górach. Badania eksperymentalne przeprowadzono na hali Ornak we wschodniej części Tatr. W artykule zamieszczono krótką dyskusję teoretyczną na temat możliwości zastosowania metody georadarowej do badania osadów postglacjalnych. Zaprezentowane w artykule wyniki badań GPR wykonanych w technice refleksyjnej pozwoliły na wyróżnienie w osadach postglacjalnych stref z różnym nagromadzeniem glin, piasków, żwirów oraz odłamków skalnych.
    Źródło:
    Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie; 2011, 37, 3; 375-382
    0138-0974
    Pojawia się w:
    Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quaternary fault activity in the SW Pannonian Basin : GPR surveying in the Bilogora Mt. (NE Croatia)
    Autorzy:
    Matoš, B.
    Zajc, M.
    Kordić, B.
    Tomljenović, B.
    Gosar, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060357.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Ground Penetrating Radar
    GPR
    Quaternary
    SW Pannonian Basin
    NE Croatia
    Bilogora Mt
    neotectonics
    Opis:
    In areas experiencing low deformation rates, landscapes provide limited evidence of ongoing tectonic activity, being either masked or altered by exogenic processes. Accordingly, the identification of fault activity and near surface deformation is commonly accomplished by multidisciplinary research combining geological, geophysical and geomorphic methods. In this study, Quaternary fault activity in the SW Pannonian Basin is investigated in the region of Bilogora, NE Croatia. The study area is positioned along the SW margin of the Drava Depression that was uplifted during the Pliocene and Quaternary within the Drava Depression Boundary Fault Zone. In this fault zone six GPR profiles were recorded. Reflection patterns, radar facies and truncations determined fault activity and near-surface deformation at four locations with vertical displacements of ≤1 m. At two sites, profiles did not show truncation of the shallowest reflections, however, an elevation difference of ca. 10 m between two palaeostream channels along one of the profiles suggests Quaternary uplift accommodated by a mapped fault. Considering the importance of the seismogenic potential of active faults and their correlation with the seismicity of Bilogora, this research will be followed by additional studies of near-surface strata deformation and palaeoseismological fault properties.
    Źródło:
    Geological Quarterly; 2017, 61, 1; 19--38
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Agricultural Tile Drainage Detection within the Year Using Ground Penetrating Radar
    Autorzy:
    Karásek, Petr
    Nováková, Eva
    Powiązania:
    https://bibliotekanauki.pl/articles/123157.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    tile drainage detection
    tile drain
    ground penetrating radar
    GPR
    geophysical method
    soil amelioration
    Opis:
    The aim of this study was to identify the tile drainage systems within the year (from spring to autumn) using the ground penetrating radar (GPR) geophysical method. The measurements were performed in the experimental locality Dehtáře in the Bohemo-Moravian Highland (Czech Republic) in the years 2016 and 2017. The profiles located in the drained area were repeatedly measured together with the drainage discharges, soil moisture and groundwater level. The best visibility of tile drains was observed during snowmelt (in March and April) when the drainage discharges usually reach their maximum. In other months, the visibility of the drains was variable, but mostly worse. For a reliable detection of individual drains, the measurements above the drainage must be performed in several profiles. Under the conditions of the Czech Republic, the best results were obtained by a 500 MHz frequency antenna.
    Źródło:
    Journal of Ecological Engineering; 2020, 21, 4; 203-211
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ground Penetrating Radar’s (GPR) Imaging and Applications to Pavement Structural Assessment: a Case of Malaysia
    Autorzy:
    Muslim, N. H.
    Mohamed, M. I.
    Amin, Z. M.
    Shafaghat, A.
    Ismail, M.
    Keyyanfar, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/224097.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pavement
    assessment pavements
    geophysical tools
    ground penetrating radar
    GPR
    REFLEX 2D software
    nawierzchnia
    ocena nawierzchni
    narzędzia geofizyczne
    georadar
    oprogramowanie REFLEX 2D
    REFLEX 2D
    Opis:
    Traditionally, pavement distress evaluations were carried out by visual observation. Traditional practice requires a person to walk along the stretch of the pavement to conduct distress survey, take photo and measure defects occurred at deteriorated surfaces. However, this approach is too subjective, generates inconsistencies of information, less reliable and time-consuming. Due to these shortcomings, the transportation practitioners in pavement maintenance seek for other alternative tools and techniques to arrest incapability of traditional practices. One of the tools available in the market is Ground Penetrating Radar (GPR). GPR is a geophysical tool known by ability to accommodate extensive data in pavement assessment, geotechnical investigation and structural assessment. The application of GPR is such new to most of road maintenance industry in Malaysia. Therefore, this study has been undertaken to evaluate the benefits of using GPR imaging and its application in assessing pavement structures in Malaysia. The GPR survey was conducted in Meranti street located at UTM (Universiti Teknologi Malaysia) campus, and then analyzed using REFLEX 2D simulation software. The finding shows there are three (3) types of information obtained from GPR survey included; identification of raw image and processed image, identification of pavement segments thickness, and identification of GPR response towards surface and subsurface conditions, which illustrated in radargram images. Furthermore, the GPR can perform at high speed and can save time. It is also beneficial for long-term investment due to ability to provide extensive information at a greater depth. The research indicates that interpretation of GPR’s radargram images consumes time due to the low resolution. Therefore, selection of GPR system is subject to level of accuracy and clarity of radar images needed in a project.
    Źródło:
    Archives of Transport; 2017, 42, 2; 39-51
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    GPR as a support tool in determining the causes of failure of objects built in the “white box” technology
    GPR jako narzędzie wspierające w określaniu przyczyn awarii obiektów zbudowanych w technologii "białej wanny"
    Autorzy:
    Lejzerowicz, A.
    Wutke, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/231334.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    badanie nieinwazyjne
    metoda georadarowa
    GPR
    technologia białej wanny
    stała dielektryczna
    amplituda fali
    fala elektromagnetyczna
    non-destructive testing
    ground penetrating radar
    white box technology
    dielectric constant
    wave amplitude
    electromagnetic wave
    Opis:
    From the construction made in the “white box” technology, first of all tightness is required - on the structural elements there should not be any cracks or scratches, through which water could penetrate, which in consequence may lead to deformation of structural elements and even loosing of their load-bearing capacity. Among the methods enabling the location of weakened places in watertight concrete, the ground penetrating radar (GPR) method is effective because the local occurrence of water in the structure evokes a clear and unambiguous anomaly on the radargram. In addition, the GPR method allows you to indicate places where water flows without the necessity of excluding the object from use and interference in the construction layers. The designation of such locations will make it possible to undertake technical activities that can facilitate the takeover of water and thus ensure the desired load-bearing capacity and usability of the object. Using the GPR method, you can also designate places that have already been deformed – discontinuities or breaking. The article presents a case study of investigations that determine the causes of leakage of tunnels made in the “white box” technology in: twice within the bottom slab of the tunnel (1 GHz air-coupled and 400 MHz ground-coupled antenna) and once in the case of tunnel walls (1.6 GHz ground-coupled antenna).
    Od konstrukcji wykonanej w technologii "białej wanny" wymagana jest przede wszystkim szczelność - na elementach konstrukcyjnych nie powinno być żadnych pęknięć ani zadrapań, przez które woda może przenikać, ponieważ to w konsekwencji może prowadzić do deformacji elementów konstrukcyjnych, a nawet utraty ich nośności. Wśród metod umożliwiających lokalizację osłabionych miejsc w wodoszczelnym betonie, metoda georadarowa (ang. ground penetrating radar - GPR), jest skuteczna, ponieważ lokalne występowanie wody w strukturze wywołuje wyraźną i jednoznaczną anomalię na otrzymanym obrazie (radargramie). Ponadto metoda GPR pozwala wskazać miejsca, w których woda przepływa bez konieczności wyłączania obiektu z użytkowania i bez ingerowania w warstwy konstrukcyjne. Wyznaczenie takich miejsc umożliwia podjęcie działań technicznych, które mogą ułatwić przejęcie wody, a tym samym zapewnić pożądaną nośność i użyteczność obiektu. Za pomocą metody GPR można również wyznaczyć miejsca, które zostały już zdeformowane – miejsca nieciągłości lub ugięć czy spękań. Artykuł przedstawia studium przypadku oraz badania, które umożliwiły określenie przyczyny wycieku w obrębie tunelu wykonanego w technologii "białej wanny" - w obrębie płyty dennej tunelu (z wykorzystaniem anteny o częstotliwości 1 GHz sprzężonej z powietrzem oraz z wykorzystaniem anteny o częstotliwości 400 MHz sprzężonej z ziemią), jak również w przypadku ścian tunelu (antena o częstotliwości 1,6 GHz sprzężona z ziemią).
    Źródło:
    Archives of Civil Engineering; 2020, 66, 3; 173-189
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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