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THE ANALYSIS OF MULTIELECTRODE RESISTIVITY MEASUREMENTS IN CASE OF SUBHORIZONTAL BOUNDARIES
Michálek, Jan ; Zima, Ladislav (advisor) ; Kněz, Jaroslav (referee)
5 The analysis of multielectrode resistivity measurements in case of subhorizontal boundaries Abstract: The aim of the diploma thesis is to analyse resolution of multielectrode resistivity measurements in case of subhorizontal boundaries. In many cases the position of horizontal boundaries from the 2D inverted section is not definitely determined. For this reason is looked for new methods to specify the localization of the boundaries. New parameters - reflection coefficient and longitudinal conductance - which were not used in these connections before are examined. Characteristics of these parameters for horizontally layered sections are studied by means of forward modelling. In addition, usability of these parameters is tested by applying them to measured field data on a profile which geological section is known from the boreholes. Attention is also payed to 1D inversion of measured field data. Key words : multielectrode resistivity measurements, horizontal boundaries, data inversion, reflection coefficient, longitudinal conductance
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Contactless conductometry for shallow parts of geological medium
Podolník, Jan ; Dohnal, Jiří (advisor) ; Kněz, Jaroslav (referee)
The task is focused on the issue of contactless conductometry for shallow parts of geological medium and it consists of two connected parts, search and experimental. The first part includes fundamental theoretical principles of contactless conductivity measurement, summary of presently manufactured electromagnetic devices (ground conductivity meters) and finally it presents the potentialities of using conductometry for detection and monitoring of contaminants. The basis of the second part comprises the field test measurements with the instrument CMD (producer GF Instruments, s.r.o. Brno) on the selected locality, namely for several depth levels. The contents of this part include the field measurement, data processing and complex interpretation of the results in connection with geological conditions of the locality, petrophysical knowledge and with the stability of the device.
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Magnetic susceptibility survey within the archaeological prospection
Lázničková, Eva ; Dohnal, Jiří (advisor) ; Kněz, Jaroslav (referee)
Title: Magnetic susceptibility survey within the archaeological prospection Author: Eva Laznickova Department: Institute of Hydrogeology, Engineering Geology and Applied Geophysics Supervisor: PhDr. RNDr. Jiri Dohnal The work is focused on the use of magnetic susceptibility measurement in archaeological prospection and consists of two interconnected parts. The core of the first one is the background research including basic theoretical and practical knowledge of magnetic susceptibility measurement, with an emphasis on field prospecting and the application of this method in archaeological research. The theme of the second part comprises the areal geophysical survey of the segment of the Hussite siege camp by Novy hrad u Kunratic realized by means of magnetic susceptibility measurement and other selected geophysical methods (magnetometry, conductometry). The contents of this part includes the field measurement, data processing and complex interpretation of the results in connection with all other available information.
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Time-lapse monitoring of active slope deformations using electrical resistivity tomography
Belov, Tomáš ; Tábořík, Petr (advisor) ; Kněz, Jaroslav (referee)
The diploma thesis deals with time-lapse electrical resistivity tomography (TL-ERT) of active slope deformations. Slope deformations represent one of the important land-forming processes. Frequently, they can cause considerable property damages and can endanger health and lives of inhabitants. Therefore, we can consider them as potentially dangerous so complete understanding of their dynamics, and their mechanisms of origin, is essential. Electrical resistivity tomography (ERT) then represents an effective geophysical tool for slope deformation investigation. Within diploma thesis, the evaluation of the several different time-series of the ERT measurements was performed. Based on findings of the one- year (August 1013 to July 2014) monitoring of resistivity changes by ERT, and also, based on daily and hourly recurrences of measured resistivity data, the optimum measuring interval has been determined, namely 12 hours. The most applicable electrode arrays and their combinations were suggested based on a testing of different electrode configurations. The results of detailed measurement with 1 m electrode spacing offered the idea of shortening of the total length of the present permanent TL-ERT profile as well as shortening the electrode spacing. These conclusions and proposed adjustments then resulted in...
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The geophysical survey in area of the mediaeval fortress in Popovice (township Benešov)
Vovsová, Jana ; Dohnal, Jiří (advisor) ; Kněz, Jaroslav (referee)
The Master's thesis "Geophysical survey in the area of the mediaeval fortress in Popovice" is divided into two parts. The first part is theoretical and summarizes the possibilities of using electrical resistivity tomography method (ERT) in archaeology. The second part deals with the actual geophysical prospecting in the area of the mediaeval fortress in Popovice (Benešov county). General information on the locality including geological setting, past geophysical exploration in the area, history of the object, archaeological findings and overview of construction development are addressed in this part, prior to the description of the field measurements. Methods used on the site are then specified: symmetrical resistivity profiling, dipole electromagnetic profiling, electrical resistivity tomography and ground penetrating radar. Subsequently, the process of field measuring in the area of the fortress is described and the data processing methods are discussed. The results of these measurements and their interpretation on the basis of compiled geophysical maps and sections are presented finally. Key words: geophysical survey, archaeology, fortress in Popovice (Benešov county).
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The geophysical survey on archaeological locality on the Malý Blaník hill
Málková, Kamila ; Dohnal, Jiří (advisor) ; Kněz, Jaroslav (referee)
Summary: The bachelor's work consists of two parts. The contents of the first one is the detailed background research of existing information about the archaeological locality on the Malý Blaník hill (geology, petrophysics, history, archaeology and other), supplemented by analysis of prospecting potentiality of different geophysical methods. The core of the second part is the areal geophysical survey of the mentioned locality by means of selected geophysical methods (geoelectrical and magnetometric methods). The contents of this part includes the field measurement, data processing and complex interpretation of the results.
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