Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 7
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

The analysis of climate changes in of the Tarfala valley and Kebnekaise Mts area, and changes within the range of the Scandinavian Glaciation shows that even in the warmest period of Holocene there were favourable environmental conditions for permafrost of the Pleistocene origin to be preserved in this area. The results of electrical resistivity surveys together with analysis of available publications indicate that two layers of permafrost can be distinguished in the Storglaciären forefield. The shallower, discountinuous, with thickness ca. 2–6 meters is connected to the current climate, The second, deeper located layer of permafrost, separated with talik, is older. Its thickness can reach dozens of metres and is probably the result of permafrost formation during Pleistocene. The occurrence of two-layered permafrost in the Tarfala valley in Kebnekaise area shows the evolution of mountain permafrost may be seen as analogous to that in Western Siberia. This means that the effect of climate changes gives a similar effect in permafrost formation and evolution in both altitudinal and latitudinal extent. The occurrence of two-layered permafrost in Scandes and Western Siberia plain indicates possible analogy in climatic evolution, and gives opportunity to understand them in uniform way.
Go to article

Authors and Affiliations

Wojciech Dobiński
Michał Glazer
Download PDF Download RIS Download Bibtex

Abstract

The article presents the method of identifying surface damage by measuring changes in resistance in graphitebased sensing skin. The research focused on analysis of conductivity anomalies caused by surface damage. Sensitivity maps obtained with Finite Element Method (FEM) in conjunction with the analytical damage model were used to build the coating evaluation algorithm. The experiment confirmed the ability of this method to identify a single elliptical-shape damage. Eight electrodes were enough to locate the damage that covered about 0.1‰ of the examined area. The proposed algorithm can prove useful in simple applications for surface condition monitoring. It can be implemented wherever it is possible to apply a thin layer of conductor to a non-conductive surface.
Go to article

Authors and Affiliations

Marek Stepnowski
1
Daniel Janczak
2
Małgorzata Jakubowska
2
Paweł Pyrzanowski
1
ORCID: ORCID

  1. Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics, Nowowiejska 24, 00-665 Warsaw, Poland
  2. Warsaw University of Technology, Institute of Metrology and Biomedical Engineering, Sw. Andrzeja Boboli 8, 02-525 Warsaw, Poland
Download PDF Download RIS Download Bibtex

Abstract

Ukraine is characterised by active natural hazards processes within different structural, tectonic and landscape zones. In Middle Dnieper basin region mass movement processes have great impact on people’s livelihoods and infrastructure. These processes occur on the slopes with different geological structure. The determining causes include lithologic and stratigraphic conditions, hydrogeological regime, structural and textural peculiarities of rocks and the geomorphology of the slopes. Landslide inventory database has been developed based on long-term observations of more than 400 landslides and landslide-prone areas. This paper takes efforts forward by combining different geological and geophysical methods to advance the current understanding of landslide phenomena and contributing towards a better informed assessment of landslide hazard and risk. The developed methodology is implemented in a test sites of Kyiv region, covering an area of 18.3 km2 situated in the Middle Dnieper basin. Electrical Resistivity Tomography, Self-Potential and Infrared Thermography techniques were employed to investigate the lithostratigraphic sequences, the geometry of landslide body and potential mass movement. The results presented here confirm the potential of using an integrated approach that combines different field data to better plan mitigation activities and measures for the effective land management. This study will be useful in increasing the safety aspects of the infrastructures and lives and also for planning of research and developmental activities.
Go to article

Bibliography

DAHLIN T. 1996. 2D resistivity surveying for environmental and engineering applications. First Break. Vol. 14. Iss. 7 p. 275–284. DOI 10.3997/1365-2397.1996014.
FOSTER C., GIBSON A., WILDMAN G. 2008. The new national Landslide Database and Landslide hazard assessment of Great Britain [online]. First World Landslide Forum. Tokyo, Japan 18–21 November 2008 p. 203–206. [Access 05.09.2020]. Available at: http://nora.nerc.ac.uk/4694/
FRODELLA W., FIDOLINI F., MORELLI S., PAZZI V. 2015. Application of Infrared Thermography for landslide mapping: the Rotolon DSGDS case study. Rendiconti Online della Società Geologica Italiana. No. 35 p. 144–147. DOI 10.3301/ROL.2015.85.
FRODELLA W., GIGLI G., MORELLI S., LOMBARDI L., CASAGLI N. 2017. Landslide mapping and characterization through Infrared Thermography (IRT): Suggestions for a methodological approach from some case studies. Remote Sensing. Vol. 9(12), 1281. DOI 10.3390/rs9121281.
FRODELLA W., MORELLI S., GIGLI G., CASAGLI N. 2014. Contribution of infrared thermography to the slope instability characterization. [online] Proceedings of World Landslide Forum 3. Beijing, China 2–6 June 2014. [Access 05.09.2020]. Available at: http://hdl.handle.net/11576/2690166
GARCÍA-RODRÍGUEZ M.J., MALPICA J.A., BENITO B., DIAZ M. 2008. Susceptibility assessment of earthquake-triggered landslides in El Salvador using logistic regression. Geomorphology. Vol. 95. Iss. 3 p. 172–191. DOI 10.1016/j.geomorph.2007.06.001.
GIGLI G., FRODELLA W., GARFAGNOLI F., MORELLI S., MUGNAI F., MENNA F., CASAGLI N. 2014. 3-D geomechanical rock mass characterization for the evaluation of rockslide susceptibility scenarios. Land-slides. Vol. 11 p. 131–140. DOI 10.1007/s10346-013-0424-2.
IVANIK O., SHEVCHUK V., KRAVCHENKO D., YANCHENKO V., SHPYRKO S., GADIATSKA K. 2019. Geological and geomorphological factors of natural hazards in Ukrainian Carpathians. Journal of Ecological Engineering. Vol. 20. Iss. 4 p. 177–186. DOI 10.12911/22998993/102964.
JABOYEDOFF M., OPPIKOFER T., ABELLÁN A., DERRON M.-H., LOYE A., METZGER R., PEDRAZZINI A. 2012. Use of LIDAR in landslide investigations: A review. Natural Hazards. No. 61 p. 5–28. DOI 10.1007/s11069-010-9634-2.
MARESCOT L., MONNET R., CHAPELLIER D. 2008. Resistivity and induced polarization surveys for slope instability studies in the Swiss Alps. Engineering Geology. Vol. 98(1) p. 18–28. DOI 10.1016/j.enggeo.2008.01.010.
MENSHOV O., SHEVCHENKO O., ANDREEVA O. 2020. Integration of magnetic and hydrogeological studies for landslides and soil erosion assessment. Case study from area Lake Glinka (Kyiv, Ukraine). Geoinformatics: Theoretical and Applied Aspects 2020. Conference Proceedings. Vol. 2020. 11–14.05.2020. Kyiv p. 1–5. European Association of Geoscientists & Engineers. DOI 10.3997/2214-4609.2020geo122.
MYKOLAENKO O.A., ZHYRNOV P.V., TOMCHENKO O.V., PIDLISETSKA I.O. 2020. Exogenic processes’ remote monitoring of Kanivske Reservoir’s right bank. Geoinformatics: Theoretical and Applied Aspects 2020. Conference Proceedings. Vol. 2020. 11–14.05.2020. Kyiv p. 1–5. European Association of Geoscientists & Engineers. DOI 10.3997/2214-4609.2020geo099.
PATELLA D. 1997. Introduction to ground surface self-potential tomography. Geophysical Prospecting. Vol. 45. Iss. 4 p. 653– 681. DOI 10.1046/j.1365-2478.1997.430277.x.
PERRONE A., LAPENNA V., PISCITELLI S. 2014. Electrical resistivity tomography technique for landslide investigation: A review. Earth-Science Reviews. Vol. 135 p. 65–82. DOI 10.1016/j.earscirev.2014.04.002.
REYNOLDS J. M. 2011. An introduction to applied and environmental geophysics. Chichester. John Wiley and Sons Ltd. ISBN 978-0- 471-48535-3 (pbk) pp. 710.
SANTOSO B., HASANAH M.U., SETIANTO 2019. Landslide investigation using self potential method and electrical resistivity tomography (Pasanggrahan, South Sumedang, Indonesia). IOP Conference Series: Earth and Environmental Science. Vol. 311 p. 1–9. International Symposium on Geophysical Issues. 2–4.06.2018, Bandung, Indonesia. DOI 10.1088/1755-1315/311/1/012068.
TELFORD W.M., GELDART L.P., SHERIFF R.E. 1990. Applied geophysics. Cambridge. Cambridge University Press. ISBN 9780521339384 pp. 792. DOI 10.1017/CBO9781139167932.
TEZA G., MARCATO G., CASTELLI E., GALGARO A. 2012. IRTROCK: A Matlab toolbox for contactless recognition of surface and shallow weakness traces of a rock mass by infrared thermo-graphy. Computers & Geosciences. Vol. 45 p. 109–118. DOI 10.1016/j.cageo.2011.10.022.
VYZHVA S., ONYSHCHUK V., ONYSHCHUK I., REVA M., SHABATURA O. 2019. Application of geophysical methods in the study of landslides. 18th International Conference on Geoinformatics – Theoretical and Applied Aspects. Kyiv, May 2019. European Association of Geoscientists & Engineers Source p. 1–5. DOI 10.3997/2214-4609.201902066.
WU J.H., LIN H.M., LEE D.H., FANG S.C. 2015. Integrity assessment of rock mass behind the shotcreted slope using thermography. Engineering Geology. Vol. 80. No. 1–2 p. 164–173. DOI 10.1016/j.enggeo.2005.04.005.
Go to article

Authors and Affiliations

Olena Ivanik
1
ORCID: ORCID
Joana Fonseca
2
ORCID: ORCID
Oleksandr Shabatura
1
ORCID: ORCID
Ruslan Khomenko
1
ORCID: ORCID
Kateryna Hadiatska
1
ORCID: ORCID
Dmytro Kravchenko
1
ORCID: ORCID

  1. Taras Shevchenko National University of Kyiv, Institute of Geology, 60, Volodymyrska str., Kyiv, 03001, Ukraine
  2. City, University of London, School of Mathematics, Computer Science and Engineering, Department of Civil Engineering, London, United Kingdom
Download PDF Download RIS Download Bibtex

Abstract

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.
Go to article

Authors and Affiliations

Grzegorz Pacanowski
1
ORCID: ORCID
Maciej Maślakowski
2
ORCID: ORCID
Anna Lejzerowicz
2
ORCID: ORCID

  1. Polish Geological Institute – National Research Institute, Rakowiecka 4, 00-975 Warsaw, Poland
  2. Warsaw University of Technology, Faculty of Civil Engineering, Al. Armii Ludowej 16, 00-637 Warsaw, Poland
Download PDF Download RIS Download Bibtex

Abstract

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.

Go to article

Authors and Affiliations

Adedibu Sunny Akingboye
Isaac Babatunde Osazuwa
Muraina Zaid Mohammed
Download PDF Download RIS Download Bibtex

Abstract

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 m 2, 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.

Go to article

Authors and Affiliations

Radosław Mieszkowski
ORCID: ORCID
Emilia Wójcik
Mikołaj Kozłowski
Paweł Popielski
ORCID: ORCID

This page uses 'cookies'. Learn more