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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:
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:
Zastosowanie metody georadarowej do identyfikacji stref erozji dna rzecznego na przykładzie wybranego odcinka doliny Wisły w Warszawie
Application of GPR method for identifying riverbed erosion zones on the example of selected section of the Vistula valley in Warsaw
Autorzy:
Mieszkowski, R.
Wójcik, E.
Żmudzin, D.
Szwarc, A.
Sosnowska, A.
Popielski, P.
Powiązania:
https://bibliotekanauki.pl/articles/2075716.pdf
Data publikacji:
2017
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
metoda georadarowa
GPR
dolina Wisły
erozja
ground penetrating radar method
Vistula riverbed
erosion processes
Opis:
In the article the occurrence ofseveral natural thresholds in Vistula River valley was discussed. These forms are stabilizing river channel regime and impeding shipping at the same time. The example of application of ground penetrating radar (GPR) for detecting and identifying the erosion zones in the bottom of the river valley was presented. The investigations were carried out along the chosen section of Vistula River in the vicinity of Gdansk Bridge (Most Gdański) in Warsaw. The survey was conductedfrom a motorboat with the MALA GroundExplorer (GX) georadar system installed with 160 MHz screen antenna. The prospection down to 7.5 m below the water surface was obtained. The applied methodology allowed to obtain radar echograms indicating the following anomalies: from the river bottom, from cohesive soil (includingNeogene clays) andfrom thresholds (noticeably elevatedforms in the bottom). In identifying and interpreting georadar anomalies, archival boreholes data were used.
Źródło:
Przegląd Geologiczny; 2017, 65, 10/2; 785--789
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rozpoznanie budowy geologicznej podłoża obiektu ARENA w Krakowie-Czyżynach metodami geofizycznymi pod kątem występowania gruntów organicznych
Astudy of bedrock geological structure of the ARENA object in Kraków-Czyżyny using geophysical methods to detect the presence of organic soil
Autorzy:
Pasierb, B.
Nawrocki, W.
Powiązania:
https://bibliotekanauki.pl/articles/2075329.pdf
Data publikacji:
2015
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
tomografia elektryczna
rezystywność
ERT
georadar
GPR
gleby organiczne
electrical resistivity tomography
Ground Penetrating Radar
organic soil
Opis:
Geophysical research assists in clarifying the methodology of future building work. The geological structure in terms of lithological variation of Quaternary and older formations was identified in the area of the proposed garage near the ARENAobject in Krakow. In particular, the possibility of the presence of inserts of organic soils was determined. Ground Penetrating Radar (GPR) and Electrical Resistivity Tomography (ERT) were used for more complete and comprehensive recognition of the ground. As a result of the study of the subsurface, thin interbeds of weak bearing organic soils have been found just outside the outline of the planned building. It was found that the Quaternary formations which were identified by geophysical and geotechnical methods are an appropriate ground for direct foundation of the object.
Źródło:
Przegląd Geologiczny; 2015, 63, 5; 289--294
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakterystyka technologii georadarowej i możliwe kierunki jej doskonalenia
Characteristic of geo-radar technology and possible directions for its improviement
Autorzy:
Wutke, M.
Powiązania:
https://bibliotekanauki.pl/articles/143892.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Komunikacji Rzeczpospolitej Polskiej
Tematy:
georadar
GPR
stała dielektryczna
współczynnik odbicia
długość fali
Ground Penetrating Radar
dielectric constant
reflection coefficient
wave length
Opis:
Technologia georadarowa (GPR) jest powszechnie stosowana do obrazowania obszarów podpowierzchniowych m.in. nawierzchni drogowych. Jest to metoda nieniszcząca, wykorzystująca do wykrywania sygnałów odbitych od konstrukcji podpowierzchniowych promieniowanie elektromagnetyczne w paśmie mikrofalowym. GPR transmituje do ziemi fale elektromagnetyczne, a gdy te uderzą w zakopany obiekt lub granicę materiałów o różnych stałych dielektrycznych, antena odbiorcza rejestruje zmiany w sygnale zwrotnym. Ważne jest, aby mieć podstawową wiedzę na temat działania georadaru, ponieważ jego możliwości, ale i ograniczenia są bezpośrednio skorelowane z nauką. W artykule charakteryzowano technologię georadarową ze zwróceniem szczególnej uwagi na ograniczenia stosowania metodologii. Opisuje możliwości zwiększenia efektywności pomiarów georadarowych i nowe obszary zastosowań.
Ground Penetrating Radar (GPR) technology is widely used for imaging the subsurface areas, including road structures. It is a non-destructive method that uses electromagnetic waves to detect signals reflected from sub-surface constructions. GPR transmits electromagnetic waves to the ground, and when these hit a buried object or boundary of materials with different dielectric parameters, the receiving antenna registers changes in the reflected signal. It is important to have a basic knowledge related to the operation of GPR, because its capabilities, but also limitations are directly correlated with science. The article describes GPR technology with particular attention to the limitations of the methodology. It describes the possibilities of increasing the GPR efficiency and new areas of applications.
Źródło:
Drogownictwo; 2018, 9; 276-280
0012-6357
Pojawia się w:
Drogownictwo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ERT i GPR – geofizyczne metody badań podłoża wykorzystywane w budownictwie liniowym
Geophysical methods ERT and GPR of subgrade identification in road and railway engineering
Autorzy:
Maślakowski, M.
Józefiak, K.
Brzeziński, K.
Superczyńska, M.
Powiązania:
https://bibliotekanauki.pl/articles/2075727.pdf
Data publikacji:
2017
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
obrazowanie elektrooporowe
ERT
mobilna metoda geofizyczna
GPR
geofizyczny test w terenie
electrical resistivity tomography
Ground Penetrating Radar
geophysical field tests
Opis:
Correct determination of subgrade layers and properties is fundamental for later design and construction stages. Results obtained using traditional geotechnical tests are always of an overly specific nature - information is only provided in certain points in the field. Number of test points and the accuracy of results’ interpretation among them influence the design of an engineering structure foundation, which greatly impacts the cost of a project. Also, the lack of soil testing or insufficient investigation of soil conditions can be the reason for all kinds of legal claims from contractors which often exceed the whole investment budget by several or even several dozen percent. In order to prevent that situation new directives for geotechnical testing include additional geophysical methods such as electrical resistivity tomography (ERT) and ground penetrating radar (GPR). These non-invasive methods can give a spatial image and thus improve the accuracy of soil strata identification. However, these methods have also disadvantages and inaccuracies related to the measurement principles and interpretation of the results. This paper presents limitations and possible errors of geophysical methods ERT and GPR based on example tests carried out for road and railway engineering structures.
Źródło:
Przegląd Geologiczny; 2017, 65, 10/2; 765--771
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rozpoznanie złoża piaskowców budowlanych z wykorzystaniem geofizycznych badań elektrooporowych i georadarowych
Recognition of building sandstone deposit with the use of geophysical resistivity sounding and georadar methods
Autorzy:
Klityński, W.
Stelmach, K.
Stefaniuk, M.
Karczewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/2074262.pdf
Data publikacji:
2014
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
sondowania elektrooporowe
VES
elektrooporowość
metoda inwersji Occama
pomiary georadarowe
GPR
piaskowce
Vertical Electrical Sounding
resistivity
Occam inversion
ground penetrating radar
sandstone complex
Opis:
The paper presents the application of Vertical Electrical Sounding (VES) and Ground Penetrating Radar (GPR) into recognition of the geometry and vertical differentiation of a deposit of color sandstones that are commonly used as elevation stones in building industry. The investigations covered sandstones of Lower Cretaceous age (Albian) that occur at the foothills of the Che³mo Mt. near Kolonia Grabowie (Radomsko district, £ódŸ province). The former quarry of Grabowie is situated in the forest area of the landscape park and this blocked further exploitation from the documented deposit. On a limited scale sandstone is still quarried form the southern edge of the old quarry. However, poor recognition of the deposit hampers the effective exploitation. The objective of the geological investigations was to examine a new part of the deposit including identification of the roof and the bottom of sandstone complex, the thickness of overlying rocks, location of faults and weathered zones, as well as recognition of the lithology down to a depth of 8 m below ground surface. Resistivity distribution in the study area was assessed with the use of VES. Much higher resistivity of sandstones as compared to surrounding rocks was advantageous. Owing to high resolution GPR, the deposit boundaries could be delineated and the stratification within the sandstone complex could be represented. The investigations resulted in construction of 2D models of the deposit and surrounding rocks and gave information on the lithology.
Źródło:
Przegląd Geologiczny; 2014, 62, 10/2; 621--628
0033-2151
Pojawia się w:
Przegląd Geologiczny
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:
Analiza porównawcza wyników badań geofizycznych i geologiczno inżynierskich na potrzeby ustalania modelu geologicznego – na przykładzie poligonu badawczego Kępa Włocławska
Comparative analysis of the results of geophysical and geological- -engineering methods on the example of Włocławek River-islet investigative testing ground
Autorzy:
Gańko, M.
Mieszkowski, R
Gańko, A.
Powiązania:
https://bibliotekanauki.pl/articles/2075284.pdf
Data publikacji:
2015
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
georadar
GPR
pionowe sondowanie elektrooporowe
VES
tomografia elektrooporowa
ERT
refrakcja
sejsmika
sondowania statyczne
CPT
ground penetrating radar
vertical electrical sounding
electrical resistivity tomography
refraction
seismics
cone penetration test
Opis:
The paper present the correlation of geophysical method with geological-engineering data. As an experimental testing ground, a terrain with simple soil conditions was selected, located on the W³oc³awek River-islet. This is a large alluvial area on the Vistula River, downstream of the W³oc³awek Dam. In the study, the following geophysical methods were applied: vertical electrical sounding (VES), refraction seismic, ground penetrating radar (GPR) and electrical resistivity tomography (ERT). The evaluation of geological-engineering conditions was executed by using the following methods: drilling, cone penetration test (CPT sounding), measurements of the underground water level and macroscopic and laboratory analyses of soils samples. The results obtained were described and presented in a graphic form.
Źródło:
Przegląd Geologiczny; 2015, 63, 2; 121--130
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie metody georadarowej do określania położenia swobodnego zwierciadła wód podziemnych w trakcie próbnego pompowania
On application of ground penetriation radar method in defining position of the free aquifer during of the test pumping
Autorzy:
Gańko, M.
Mieszkowski, R.
Gańko, A.
Powiązania:
https://bibliotekanauki.pl/articles/2075387.pdf
Data publikacji:
2015
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
wody podziemne
piezometr
lej depresji
pompowanie
sondowanie statyczne
CPT
metoda georadarowa
GPR
free aquifer
piezometer
depression cone
pumping well with observation weels
cone penetration test
ground penetrating radar
Opis:
In this paper were verify the possibilities of use the ground penetrating radar method to defining the range of depression cone during pumping test the first free aquifer. On the experimental area there were: pumping well with observation weels, geotechnical weels and cone penetration tests. This made possible the credible interpretation of the results with GPR investigations. GPR measurements were executed before pumping and after stabilizing the depression. On the echograms there were clearly appeared the free aquifer before and during of the pumping. On the basis of geophisical investigations it was successful to interpret the position of free aquifer and the range of depression cone.
Źródło:
Przegląd Geologiczny; 2015, 63, 10/1; 721--726
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena możliwości zastosowania metody georadarowej i elektrooporowej do identyfikacji rozluźnionych stref gruntów niespoistych
Evaluation of the applicability of GPR and resistivity methods for identifying loose zones in non-cohesive soils
Autorzy:
Mieszkowski, R.
Zawrzykraj, P.
Żmudzin, D.
Wójcik, E.
Popielski, P.
Powiązania:
https://bibliotekanauki.pl/articles/2075707.pdf
Data publikacji:
2017
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
metoda georadarowa
GPR
metoda elektrooporowa
ERT
sondowanie dynamiczne
DPL
zagęszczenie nasypu
wskaźnik zagęszczenia
ground penetrating radar method
electrical resistivity tomography method
dynamic sounding
relative density
degree of compaction
Opis:
The results of the possibility of geophysical methods application (such as geoelectrical ones, including ground penetrating radar and electrical resistivity tomography) to identify areas of loose sands were presented in the article. Registered anomalies obtained from geophysical survey have been verified by geological and engineering tests (drillings and dynamic probing). Measurements were carried out along the part of the lateral earth dam, consisting of man-made soils with a thickness of approximately 7 m and underlying alluvial medium grained sands. The results obtained from the geophysical survey and direct assessment of density by means of dynamic probing allowed to demonstrate the relationship between a specific type of geophysical anomalies and the density of non-cohesive man-made soils.
Źródło:
Przegląd Geologiczny; 2017, 65, 10/2; 779--784
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geometryzacja form zjawisk krasowych na podstawie badań metodą georadarową
Geometrization of karst phenomena based on GPR research
Autorzy:
Ortyl, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/2075956.pdf
Data publikacji:
2019
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
metoda georadarowa
kras
wapienie
jaskinia
pustki
modelowanie danych
naziemne skanowanie laserowe
ground penetrating radar
GPR
karst
limestones
cave
voids
finite differential time domain
FDTD
terrestrial laser scanning
TLS
Opis:
Recognition of subsoil in areas threatened with discontinuous deformation associated with the existence of natural and mining voids can be implemented by various geophysical methods. The purpose of such research, apart from confirming the existence of voids, is to determine their spatial extent. This is not a simple issue, regardless of the geophysical method used. This paper discusses the possibilities of geometrization of karst phenomenon localization using the ground penetrating radar (GPR) method by the example of a karst cave as a natural void. The area of data acquisition is located on limestone formations with numerous karstforms. The study object is the main hall of the karst cave with a height of up to 3 m, located at a depth of 3 to 7 m below the surface. Such location and shape of the subsurface structure made it possible for the author to perform a wide range of research. Their original aspects are presented in this paper. The shape of the hall was obtained using terrestrial laser scanning (TLS). The GPR data were obtained employing the 250 MHz shielded antenna that was directly positioned using a robotized total station with the option of automatic target tracking. Thus, the GPR and geodetic data were immediately achieved in a uniform coordinate system. The accuracy of the data obtained in this way is discussed in this paper. The author’s original algorithm for processing of GPR data into a point cloud is presented. Based on the results obtained, it was possible to compare the GPR signal, which represents the shape of the cave hall, in relation to its image in the form of a point cloud from terrestrial laser scanning. A unique part of this paper is the selection of filtration procedures and their parameters in optimal GPR data processing, which were widely discussed and documented in a way beyond the standard filtration procedures. A significant contribution is the analysis that was carried out on the data obtained in the field and on the model data generated using the finite difference method. Modeling was carried out for two wave sources: exploding reflector and point. The presented methodology and discrimination between the actual shape of the cave, GPR field data and model data made it possible for the author to draw many conclusions related to the possibilities of shape geometrization of the subsurface voids determined by the GPR method.
Źródło:
Przegląd Geologiczny; 2019, 67, 4; 252--269
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 17

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