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Tytuł:
Electrical resistivity tomography to delineate greenhouse soil variability
Autorzy:
Rossi, R.
Amato, M.
Bitella, G.
Bochicchio, R.
Powiązania:
https://bibliotekanauki.pl/articles/24838.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Opis:
Appropriate management of soil spatial variability is an important tool for optimizing farming inputs, with the result of yield increase and reduction of the environmental impact in field crops. Under greenhouses, several factors such as non-uniform irrigation and localized soil compaction can severely affect yield and quality. Additionally, if soil spatial variability is not taken into account, yield deficiencies are often compensated by extra-volumes of crop inputs; as a result, over-irrigation and overfertilization in some parts of the field may occur. Technology for spatially sound management of greenhouse crops is therefore needed to increase yield and quality and to address sustainability. In this experiment, 2D-electrical resistivity tomography was used as an exploratory tool to characterize greenhouse soil variability and its relations to wild rocket yield. Soil resistivity well matched biomass variation (R2=0.70), and was linked to differences in soil bulk density (R2=0.90), and clay content (R2=0.77). Electrical resistivity tomography shows a great potential in horticulture where there is a growing demand of sustainability coupled with the necessity of stabilizing yield and product quality.
Źródło:
International Agrophysics; 2013, 27, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of electrical resistivity tomography in assessing complex soil conditions
Autorzy:
Kowalczyk, S.
Zawrzykraj, P.
Mieszkowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/2060284.pdf
Data publikacji:
2015
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
electrical resistivity tomography
ERT
resistivity cone penetration test
RCPT
peat
Opis:
Appropriate assessment of spatial variation of soil and hydrogeological conditions is a crucial issue in recognizing foundation soil. The best methods to achieve this goal are those that supply continuous rather than scattered data on soil medium variation. Electrical resistivity was measured with the resistivity cone penetration test (RCPT) and electrical resistance tomography (ERT) with electrodes spaced at 1 and 3 m in order to discriminate peat layers beneath low-resistivity clays. Soil conditions determined by drillings and ERT were not concordant, therefore resistivity modelling of the medium was conducted based on geological units determined by drillings and values of apparent resistivity obtained from RCPT. The strata thickness and electrode spacing is shown to have influence on resistivity imaging in complex soil conditions.
Źródło:
Geological Quarterly; 2015, 59, 2; 367--372
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Karstic landscape detection using electrical resistivity tomography in northeast Algerian
Autorzy:
Brahmi, Serhane
Hadji, Riheb
Chemseddine, Fehdi
Brahmi, Smail
Hamad, Amor
Hamed, Younes
Powiązania:
https://bibliotekanauki.pl/articles/2175182.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie
Tematy:
natural hazards
doline
geophysical survey
resistivity
underground void
zagrożenia naturalne
dolina
badanie geofizyczne
rezystywność
pustka podziemna
Opis:
Sinkhole (doline) collapse is one of the major natural hazards threatening people and property in the Middle East and North Africa (MENA) region, especially if the bedrock structure is epi-karstic, covered by encrusted material. Many dolines-avens collapses have been recorded in urban and rural areas in Northeast Algeria. Our study identifies localized deformation that may be caused by a sinkhole activity based on the electrical resistivity tomography (ERT) imaging in Setifian high plains. For this task, we conducted 2-D Wenner and Wenner-Schlumberger transects profiles. The geological and hydrogeological study helped to calibrate the resistivity model, and in this regard, expound on the proneness of the limestone layer to collapse. The obtained model highlights the heterogeneity of the subsurface. The inverted transects allowed the investigation of 20 m depth with Wenner array and 52 m with Wenner-Schlumberger. The Wenner inverted models imaged the chimney and different karst networks until 20 m depth; even as the Wenner-Schlumberger models imaged a new karstic cavity in the limestone layer. ERT imaging has once again proven its effectiveness in mapping sinkholes based on its ability to detect resistivity. Our research can certainly benefit karst collapse monitoring in other areas of the high plain region.
Źródło:
Geomatics, Landmanagement and Landscape; 2022, 3; 103--115
2300-1496
Pojawia się w:
Geomatics, Landmanagement and Landscape
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Case study of electrical resistivity tomography measurements used in landslides investigation, Southern Poland
Autorzy:
Mita, M.
Glazer, M.
Kaczmarzyk, R.
Dąbrowski, M.
Mita, K.
Powiązania:
https://bibliotekanauki.pl/articles/100780.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Śląski. Wydział Nauk o Ziemi
Tematy:
electrical resistivity tomography
ERT
numerical modelling
landslide
mass movements
elektryczna tomografia rezystywnościowa
modelowanie numeryczne
osuwisko
ruchy masowe
Opis:
Mass movements are an ever present threat to building construction, water management, vegetation formation and biodiversity. This paper presents an approach to landslides research based on non-invasive geoelectrical method - Electrical Resistivity Tomography (ERT). Mapping and displacement monitoring of unstable slopes is crucial for the hazards prevention and assessment. The ERT technique is an effective tool to obtain structural differentiation of geological medium through interpretation of 2D electrical resistivity models. The main advantage of the method is a wide range of applicability what makes its useful during field works on a landslide. It is commonly used for measurements of slope instability, determination of shear surface, landslide susceptibility, depth of bedrock, slip plane geometry. The aim of the work is to identify the geological structures underneath three selected landslides in south Poland: in Racibórz, Milówka and Porąbka. Attempts have been focused on determination of the usefulness of the proposed ERT methodology for evaluation of possible further development of mass movements. On two investigation sites two different arrays have been used: Wenner-Schlumberger and dipole-dipole which allowed to prepare combined data set and resistivity models based on them. Forward modelling of synthetic models based on a priori information allowed to understand anomalies present on resistivity models. Applied approach ensured quality increase of final interpretation of resistivity models.
Źródło:
Contemporary Trends in Geoscience; 2018, 7, 1; 110-126
2299-8179
Pojawia się w:
Contemporary Trends in Geoscience
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrical resistivity tomography for spatiotemporal variations of soil moisture in a precision irrigation experiment
Autorzy:
Mertzanides, Y.
Tsakmakis, I.
Kargiotis, E.
Sylaios, G.
Powiązania:
https://bibliotekanauki.pl/articles/2082914.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
electrical resistivity tomography
non-intrusive
soil measurements
soil moisture determination
heterogeneous
clay-rich soils
water-saving technology
Opis:
Soil moisture temporal variations play a key role in the hydrological processes occurring in the unsaturated zone, which are critical for annual crop yields. The electrical resistivity tomography technique was applied in a field cultivated with cotton in northern Greece, thereby investigating its potential to serve as a reliable soil moisture-monitoring tool for precision irrigation in highly heterogeneous, clay-rich soils. Repeated surface resistivity measurements were made along two plant lines combined with soil water content measurements conducted with a reference gravimetric method and an electromagnetic sensor. Resistivity pseudo-sections were inverted to produce 2D resistivity models, and time-lapse inversion algorithms were also used, to better calculate the temporal changes in subsurface soil resistivity. The results showed clear spatial and temporal changes in resistivity transects in accordance with rainfall/irrigation and dry periods. The soil resistivity data exhibited a power model relationship with gravimetric soil moisture point measurements and a fair correlation with electromagnetic sensor profiles.
Źródło:
International Agrophysics; 2020, 34, 3; 309-319
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
2D Electrical Resistivity Tomography interpretation ambiguity - example of field studies supported with analogue and numerical modelling
Autorzy:
Bania, G.
Ćwiklik, M.
Powiązania:
https://bibliotekanauki.pl/articles/184445.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
electrical resistivity tomography ERT
ambiguity
2D inversion
analogue modelling
numerical modelling
Opis:
Single Electrical Resistivity Tomography (ERT) survey was carried out in the Manor and Park Complex in Nowa Huta (Krakow Branice, Poland). It was applied at a small distance and parallel to the longer wall of a monumental building containing an empty 3 m deep basement. Analogue modelling was performed in order to recreate the field study at the proper scale. The laboratory set-up consisted of a water tank where electrodes were mounted to the particular plate, which rested on water surface. The basement model was made out of a non-conducting material. The default and robust inversions were tested and these variants were also considered with the use of numerical modelling. Laboratory experiments have confirmed that zones visible in the interpreted field section are caused by the influence of the building cellar located next to the survey line. Zones of this kind are additionally disturbed by the local geological structure. The experiment has pointed out, among others, that as the distance between the survey line and the underground body increases, the inversion results are still burdened by an object influence. Thus, similar situations can be verified with the use of analogue modelling presented in this paper or 3D numerical one.
Źródło:
Geology, Geophysics and Environment; 2013, 39, 4; 331-339
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using Electrical Resistivity Tomography (ERT) as a tool in geotechnical investigation of the substrate of a highway
Autorzy:
Maślakowski, Maciej
Kowalczyk, Sebastian
Mieszkowski, Radosław
Józefiak, Kazimierz
Powiązania:
https://bibliotekanauki.pl/articles/2027103.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electrical resistivity tomography (ERT)
expressway
field testing
geotechnical engineering
organic soils
peat
Opis:
Geo log i cal and geotechnical en gi neer ing field tests, like struc ture drillings and dy namic (DPL, DPSH) or static probing (CPT), are con sid ered for a fun da men tal source of in for ma tion about soil and wa ter en vi ron ments. Since Eurocode 7 has been in tro duced, it has be come more com mon to use also dilatometers (DMT) or pres sure me ters (PMT). Re sults ob tained us ing all the men tioned tests are al ways of a dis crete na ture – in for ma tion is pro vided in cer tain points in the field. How ever, they de ter mine the ba sis for cre at ing spa tial mod els of geo log i cal struc ture and geotechnical con di - tions of a sub stra tum. The range and num ber of in ves ti ga tions con ducted (in clud ing drill ing, prob ing and lab o ra tory tests) in flu ence pre ci sion, in which a geo log i cal struc ture is iden ti fied and thus, also af fect prob a bil ity of com pat i bil ity be tween spa tial model and real geo log i cal con di tions of a sub stra tum. In the pa per, re sults of non-in va sive elec tri cal re sis tiv ity to mog ra phy (ERT) method are pre sented, com pris ing 2-di men sional im age of a soil me dium re sis tance. Elec tri cal re sis tance is a pa ram e ter that re flects di ver si fi ca tion of a soil me dium, con sid er ing its lithological as pect. In ad di tion, when com bined with drill ing re sults, it can be used to ac cu rate de ter mi na tion of bound aries be tween soil lay - ers. Car ry ing out of ERT tests in the field dur ing ex press way con struc tion con trib uted to iden ti fi ca tion of weak, low-strength soils like or ganic soils (peat, aggradated mud) and of soft con sis tency co he sive soils. These kinds of soil are the main cause for un ac cept able de for ma tions ap pear ing in the new road en gi neer ing struc ture.
Źródło:
Studia Quaternaria; 2014, 31; 83-89
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Saltwater monitoring with long-electrode electrical resistivity tomography
Monitoring wód zasolonych przy użyciu metody tomografii elektrooporowej długich elektrod
Autorzy:
Voß, T.
Ronczka, M.
Gunther, T.
Powiązania:
https://bibliotekanauki.pl/articles/2062349.pdf
Data publikacji:
2013
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
electrical resistivity tomography ERT
long electrodes
saltwater monitoring
environmental safety of CO2-storage
complete electrode model
tomografia elektrooporowa
długie elektrody
monitoring wód zasolonych
bezpieczeństwo środowiskowe
magazynowanie CO2
kompletny model elektrodowy
Opis:
Since 2011 the German well logging company Bohrlochmessung – Storkow GmbH and the German Leibniz Institute for Applied Geophysics are engaged in the joint research project ‘SAMOLEG – Saltwater monitoring with long electrode geoelectrics’ (electrical resistivity tomography – ERT), with a grant of the German Federal Ministry of Education and Research. The basic concept of SAMOLEG is to use the existing networks of old steel-cased groundwater measuring wells as current injection and voltage electrodes for electrical resistivity tomography measurements in order to obtain deeper access to salt water bearing aquifers than with conventional surface ERT. Permanent wiring of several old wells would give the opportunity to conduct cost-efficient ERT measurements for saltwater monitoring with a high temporal sampling on sites that are threatened by saltwater rise due to anthropogenic (e.g. natural gas /CO2-storage, water production from wells) or natural causes (e.g. decreasing precipitation due to climate change). First model tank and numerical modelling experiments reveal different sensitivities of ‘equal-length’ and ‘unequal-length’ combinations of wells to rising or laterally inflowing saltwater. Field measurements on a test site in Eastern Brandenburg with known groundwater salinization demonstrate the monitoring potential of the SAMOLEG concept.
Od 2011 roku niemieckie przedsiębiorstwo geofizyki otworowej Blm–storkowgmbh wspólnie z Instytutem Leibniza ds. Geofizyki Stosowanej są zaangażowane w projekt badawczy pt. „SAMOLEG – Monitorowanie zasolenia wód podziemnych za pomocą elektrooporowej metody długich elektrod” (tomografia elektrooporowa) – grant Niemieckiego Federalnego Ministerstwa Edukacjii Badań Naukowych. Zasadniczą ideą projektu SAMOLEG jest wykorzystanie istniejącej sieci starych stalowych studni i piezometrów jako elektrod prądowych i pomiarowych w technice tomografii elektrooporowej, w celu dostępu do głębszych zasolonych poziomów wodonośnych, niż mogłoby to mieć miejsce, bazując na konwencjonalnych powierzchniowych metodach elektrooporowych. Trwałe okablowanie kilku studni w wybranej sieci badawczej dałoby możliwość przeprowadzania częstego niskonakładowego monitoringu zasolenia wód w miejscach, które z przyczyn antropogenicznych (np. Magazynowanie gazu lub CO2, zintensyfikowane ujmowanie wód podziemnych) oraz naturalnych (np. Niewielkie opady atmosferycznewywołane zmianami klimatycznymi) zagrożone są podniesieniem się poziomu wód zasolonych. Pierwsze badania laboratoryjne oraz modelowanie numeryczne ujawniły zmienne czułości kombinacji elektrod o równej i różnej długości względem wznosu lub bocznego dopływu wód, natomiast pomiary terenowe we wschodniej Brandenburgii, na polu testowym o znanym zasoleniu wód podziemnych, potwierdziły zakładany potencjał monitoringowy koncepcji SAMOLEG.
Źródło:
Biuletyn Państwowego Instytutu Geologicznego; 2013, 456 Hydrogeologia z. 14/2; 621--626
0867-6143
Pojawia się w:
Biuletyn Państwowego Instytutu Geologicznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrical resistivity tomography (ERT) of pit-and-mound microrelief, Mt Rogowa Kopa case study, the Stołowe Mountains, SW Poland
Autorzy:
Pawlik, Ł.
Kasprzak, M.
Powiązania:
https://bibliotekanauki.pl/articles/294410.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Tematy:
2D electrical resistivity tomography (ERT)
pit-and-mound microtopography
tree uprooting
Stołowe Mountains
Sudety
Opis:
This article presents results of geophysical analyses based on electrical imaging of slope mantles with pit-and-mound microtopography developed on the Rogowa Kopa hillslope in the Stołowe Mountains, SW Poland. The use of two dimensional electrical resistivity tomography (2D ERT) to non-invasive analyses of the hillslope microrelief allowed completing previous results of geomorphological and soil studies. The tomograms (inversion results) acquired across individual forms of treethrow pits and mounds can be interpreted according to regolith thickness and its wetness, but also smaller features such as relict and fresh tree root systems detected in the mounds. These features were compared to a general picture of geoelectrical resistivity measured in the main cross-section of the analyzed hillslope. The differences in slope cover characteristics observed on the tomograms confirm important role of the tree uprooting process in formation of some basic features of the regolith and soils, including their uneven redistribution across the hillslope.
Źródło:
Landform Analysis; 2015, 29; 41-47
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Practical aspects of field work carried out by Electrical Resistivity Tomography
Praktyczne aspekty prac polowych wykonywanych metodą tomografii elektrooporowej
Autorzy:
Pacanowski, Grzegorz
Maślakowski, Maciej
Lejzerowicz, Anna
Powiązania:
https://bibliotekanauki.pl/articles/2174088.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The following article collects and describes several practical problems that can be encountered when performing geophysical field measurements using the electrical resistivity tomography (ERT) method. The methodology of work carried out with the Terrameter LS apparatus of the Swedish company ABEM (currently the company has changed its name to GUIDELINE GEO) was presented and discussed. The attention was paid to interesting solutions that increase the efficiency of works, especially in works related to linear investments. Errors that may appear during the use of the roll-along method are indicated, in particular, those appearing in measurements where too long measurement sections are transferred, as well as problems resulting from high electrode earthing, nonlinear profile traces and variable morphology. It describes how the use of different measurement systems affects the depth of prospecting, and which systems cope well in the area with disturbances. The article also emphasizes that the work should be properly planned before starting field research.
W niniejszym artykule zebrano i opisano kilka praktycznych problemów, z którymi można się spotkać w trakcie wykonywania geofizycznych pomiarów polowych, stosując metodę tomografii elektrooporowej (ERT).Przedstawiono i omówiono metodykę prac wykonywanych aparaturą Terrameter LS szwedzkiej firmy ABEM (obecnie firma zmieniła nazwę na GUIDELINE GEO). Zwrócono uwagę na ciekawe rozwiązania, które zwiększają efektywność prac, szczególnie w pracach związanych inwestycjami liniowymi. Wskazano błędy jakie mogą pojawić się podczas stosowania metody roll-along, w szczególności pojawiające się w pomiarach gdzie przenoszone są zbyt długie sekcje pomiarowe, a także problemy wynikające z wysokich uziomów elektrod. Opisano jak stosowanie różnych układów pomiarowych wpływa na głębokość prospekcji, a także które układy radzą sobie dobrze w obszarze z zakłóceniami. W artykule zwrócono uwagę na to by w odpowiedni sposób planować prace przed przystąpieniem do badań terenowych.
Źródło:
Archives of Civil Engineering; 2022, 68, 4; 331--346
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural setting of the Čertovka landslide (Ústí nad Labem, Czech Republic) analysed by morphostructural analysis and electrical resistivity tomography
Autorzy:
Raska, P.
Hartvich, F.
Cajz, V.
Adamovič, J.
Powiązania:
https://bibliotekanauki.pl/articles/2059970.pdf
Data publikacji:
2014
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
landslide
structural setting
faults
volcanic complex
geophysics
Ústí nad Labem
Opis:
The Čertovka landslide at Vaňov south of Ústí nad Labem, Czech Republic, is developed in a steep slope of the Labe River Valley (LRV). A major episode of landsliding occurred in the first months of 1995, and the slope at Vaňov has been subjected to geological and geomorphological investigation since then. This paper presents structural setting of the Čertovka landslide based on the latest geological survey, detailed geomorphological mapping, morphostructural analysis and results of electrical resistivity tomography. The landslide was found to be initiated at the boundary between Late Eocene to Oligocene basaltic lavas above and volcaniclastics below, with bedding dipping against the slope (anaclinal slope). The underlying volcaniclastics show tendency to argillization and have a much lower rock strength, which acts as an important factor of slope instability at the site. The Čertovka landslide is a complex slope deformation consisting of several landslides and flowslides, with boulder streams merging into a boulder accumulation further downslope. The headscarp area of the landslide developed at one of the structural levels built by basaltic lavas and forming step-like morphology of the valley slope. The headscarp coincides with the course of a regional E–W-striking Vaňov Fault which underwent multiple tectonic history and is associated with a dense fracture system including smooth slickensides on the headscarp. Structural observations combined with detailed knowledge of the anatomy of the landslide based on airborne data, surface data and geophysical data permitted to conclude on structural controls of landsliding and predict future evolution of the slope deformation. Future landsliding will be initiated at structural levels of basaltic rocks, with the headscarps developed along fractures parallel to the Vaňov Fault. The probable gradual retreat of headscarps at the individual structural levels along the slope profile denotes a retrogressive landslide style.
Źródło:
Geological Quarterly; 2014, 58, 1; 85--98
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recognition of the flysch substrate using the electrical resistivity tomography (ERT) method to assess the effectiveness of the injection process
Autorzy:
Ćwiklik, Michał
Pasierb, Bernadetta
Porzucek, Slawomir
Powiązania:
https://bibliotekanauki.pl/articles/27310120.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
electrical resistivity tomography ERT
monitoring
Carpathian flysch
injection
Opis:
During the construction of a section of the S-7 Lubień – Rabka-Zdrój dual expressway, located in the area of the Carpathian flysch (Carpathian Flysch Belt, South Poland), damage to the embankment was observed, as well as cracks and depressions in the new pavement. An analysis of the geological and engineering conditions in the area of the road section under construction showed the existence of a complex tectonic structure of the flysch formations, a shallow groundwater table, and numerous landslides. In order to stabilize the road substrate, it was decided to carry out injections, and the locations of these injections were initially geotechnically tested. However, due to the high variability of the geological structure, the target method employed was electrical resistivity tomography (ERT), which performed the survey in two stages. In Stage I, the geoelectrical/geochemical structure of the near-surface zone was identified, and the probable causes of road damage were indicated. This stage was completed by performing the stabilization and sealing process of the ground with an injection mixture. In Stage II, studies were carried out to evaluate the effectiveness of the injection process. The ERT method effectively identified the shallow geological structure and, in particular, delineated the zone of strong fractures in the flysch and areas associated with faults. Using the electrical resistivity tomography method, it was also possible to determine the injection mixture’s approximate penetration depth and the loosening zone’s degree of filling.
Źródło:
Geology, Geophysics and Environment; 2023, 49, 2; 197--202
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of near-surface sediments based on Electrical Resistivity Tomography measurements in the vicinity of the Wawel Hill (Krakow, Poland)
Autorzy:
Ćwiklik, M.
Powiązania:
https://bibliotekanauki.pl/articles/955197.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
applied geophysics
electrical resistivity tomography
near-surface
Wawel Hill
Opis:
The Electrical Resistivity Tomography (ERT) method was applied at the SW foot of the Wawel Hill was applied. The survey was carried out along five survey lines (P1-P5), 50 m long each. The Wenner alpha array with spacing a = 0.5 m, 1.0 m, 1.5 m, 2.0 m, 2.5 m, 4.0 m, 5.5 m, 7.5 m, and 10.0 m was used. The basic electrode spacing was 0.5 m. In apparent resistivity contours and sections we can distinguish two zones, which have noticeably different resistivity values. The low resistivity zone dominates in the deeper part of the section on all survey lines, especially on the profiles located in the close neighbourhood of the Vistula River. The relative high resistivity zone is probably the effect of complex local geology, as well as the influence of the limestone of the Wawel Hill. Based on ERT inversion results, three resistivity zones were distinguished. Then the probable lithological or/and anthropogenic character was assigned to them. The shallowest zone has the thickness of about 0.5 m and results probably from accumulation of weathered limestone fragments derived from the Wawel Hill. It may be that high resistivity zones have anthropogenic character. Below, a zone of water-bearing sands was recorded, which may result from redevelopment and reclamation of this area. Thickness of this zone increases towards the Vistula River. Another zone, which can be identified with limestone, was identified on survey lines P4 and P5. This could also be result of accumulation of the calcareous debris for the purpose of planation of the area. In order to generalize and simplify the characterization of the quaternary sediments, ID interpretation was made. The method allows us to estimate the depth of groundwater, which in that place is about 5 m.
Źródło:
Geology, Geophysics and Environment; 2013, 39, 4; 351-361
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrical resistivity tomography for geo-engineering investigation of subsurface defects: a case study of Etioro-Akoko highway, Ondo State, southwestern Nigeria
Autorzy:
Akingboye, Adedibu Sunny
Osazuwa, Isaac Babatunde
Mohammed, Muraina Zaid
Powiązania:
https://bibliotekanauki.pl/articles/2024721.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electrical resistivity tomography (ERT)
geo-engineering
deep weathered troughs
multiple fractures
pavement failure
highway
Etioro-Akoko
Opis:
The durability of roads is dependent on the proper screening of the variations in subsurface geological characteristics and conditions through geo-engineering investigations and good construction practices. In this study, electrical resistivity tomography (ERT) technique was used to investigate the subsurface defects and potential failures along the substrate of Etioro-Akoko highway, Ondo State, southwestern Nigeria. Results of the inverse model resistivity sections generated for the two investigated traverses showed four distinct subsurface layers. The shallow clayey topsoil, weathered layer, and partially weathered/fractured bedrock have resistivity values ranging from 4–150 ohm-m, 10–325 ohm-m, and 205–800 ohm-m, with thickness values of 0–2 m, 0.5–12.5 m, and less than few meters to > 24 m, respectively. The fresh bedrock is characterised by resistivity generally in excess of 1000 ohm-m. The bedrock mirrored gently to rapidly oscillating bedrock troughs and relatively inclined deep penetrating multiple fractures: F1–F’1, F2–F’2 and F3–F’3, with floater in-between the first two fractures. These delineated subsurface characteristic features were envisaged as potential threats to the pavement of the highway. Pavement failures in the area could be attributed to the incompetent clayey sub-base/substrate materials and the imposed stresses on the low load-bearing fractured bedrock and deep weathered troughs by heavy traffics. Anticipatory construction designs that included the use of competent sub-base materials and bridges for the failed segments and fractured zones along the highway, respectively, were recommended.
Źródło:
Studia Quaternaria; 2020, 37; 101-107
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Electrical Resistivity Tomography (ERT) in the investigation ofQuaternary land slide zones, based on the selected regions of Płock slope
Autorzy:
Kaczmarek, Łukasz
Mieszkowski, Radosław
Kołpaczyński, Marcin
Pacanowski, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/2027107.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
slope sta bil ity
the P³ock slope
Electrical Resistiv ity Tomography (ERT)
quaternary
Opis:
The article shows the results of geophysical surveys performed by using Electrical Resistivity Tomography (ERT) method on se lected ragion of P³ock slope of a Tumski hill near Ba sil ica of As sump tion of the Blessed Vir gin Mary in P³ock and in Maszewo by the Vistula River a few ki lo me ters north of P³ock. The above-men tioned sec tions were se - lected due to land slide phe nom ena ob served there. Geo phys i cal sur veys were con ducted in or der to ver ify the state of the dis tri bu tion of elec tri cal re sis tiv ity in the sec tors where mass move ment was iden ti fied. The electrofusion crosssec tion near Ca the dral Ba sil ica shows clays and sands. Also in ERT prospection a zone of loose soils with high re sis - tance is clearly vis i ble. The re sults of the ERT method from Maszewo, in di cates his tor i cal land sur face of a land slide and that the slope in Maszewo con sists of co he sive de pos its. In or der to de scribe these par tic u lar is sues, geo log i cal cross-sec tions and safety fac tor ob tained by cal cu la tion are pre sented for the an a lyzed parts of the slope. The safety factor shows that prob a bil ity of land slide ac tiv ity near Ca the dral Ba sil ica is very un likely and in Maszewo is very high.
Źródło:
Studia Quaternaria; 2014, 31; 101-107
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
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