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Volcanic rocks and possibilities of their research using geophysical methods
Votrubcová, Kristýna ; Valenta, Jan (advisor) ; Vlček, Josef (referee)
5 Abstrakt (EN) The research focuses on the application of geophysical methods and subsequent data processing for the prospecting of igneous rocks and the search for volcanic structures. The literature review summarizes the physical and petrological foundations of various physical methods that can be utilized in the search for volcanic rocks, and discusses their most appropriate uses. The greatest emphasis is placed on the method of magnetometry, which is significant in identifying volcanoes. The work also explores the use of geoelectrical and seismic methods, radiometry, and gravimetry. In the practical section, geophysical measurements were conducted in the field to map the extent of the Tertiary volcano and other geological structures in the Elbe Sandstone Mountains. The extent of the volcanic body was successfully mapped using magnetic measurements. The results of the measured Electrical Resistivity Tomography (ERT) profile corresponded to the extent of the volcanite body and showed that the body was significantly fractured. Other findings include the mapping of a fault zone, to which the volcanic body ascend could be linked, and the mapping of another fault zone in a nearby valley, which is assumed to have a fault character. Key words: igneous rocks, volcanism, geophysics, magnetometry, VLF, ERT
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Structural and tectonic analysis of the mesa in Polická basin
Dergunova, Alexandra ; Hartvich, Filip (advisor) ; Mertlík, Jan (referee)
The area of the Polická basin is in fault and tectonic structures region. Neotectonic and recent long-term movements occur along the geomorphological systems. Endogenous and exogenous processes are the main reason of tectonic activity in the area. Polická basin and its look is influenced by geomorphological processes and represents a perfect region for the study of active fault structures. This area is influenced by physical-geographic characteristics of the region and reflects with long-term processes which determine the development of this area. Two large systems of Polický and Skalský fault run across the selected area. The course of these systems is confirmed by previous studies, and it is indicated in geological maps. The area of faults crosses is area with the most affected geomorphological elements of the relief. Ostaš, Hejda and Kočičí skaly mesas is greatly influenced by Polický fault zone, mainly due to fault close location to the selected geomorphological surface forms. Result of the fault zones pressure is observed on various structures and their form. During the relief and surface features analysis and examination were used various methods, which confirmed the influence of fault zones. The fracture systems showed the same orientation as the Polický fault orientation (SSE - NNW)....
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Structural tectonic and morphometric characteristics of the Upper Otava river basin
Burkytová, Šárka ; Hartvich, Filip (advisor) ; Stemberk, Jakub (referee)
The thesis deals with the structural-geomorphological characteristics and morphometric analysis of the Upper Otava River basin, located in the Šumava Mountains. The introductory part is focused on the literature search, in which the area of interest is evaluated in terms of physical-geographical characteristics. The review also deals with an overview of methods of structural geomorphological research with a focus on morphostructural analysis of relief. The structural-geomorphological characterization was established by means of a joint analysis of selected sites where the direction of the joint surfaces and their slope were measured. A morpholineament analysis and fault tectonics analysis were also done to define the morphostructures. The individual morphostructures were evaluated using morphometric analysis methods and compared using morphostructure synthesis in terms of their similarities or differences. Finally, the geomorphological evolution in the area of interest was outlined. Keywords Morphostructural analysis, structural measurements, Šumava mountains, morphometry, morpholineaments
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Escalation of the crisis in Greek public broadcasting television in 2013-2014
Srpová, Zuzana ; Köppl, Daniel (advisor) ; Štoll, Martin (referee)
The main topic of this thesis is the functioning of the public service media, especially public service television broadcasters. After general definitions of the basic terms associated with this topic, the thesis highlights the differences between the media in the private and the public sectors, and characterizes the public service media in the previously selected European countries: the United Kingdom, Germany, Italy and the Czech Republic. The choice of these particular states was based on their different economic, political and media systems. The history, the development and the crisis of the Greek public service media are subjected to a thorough analysis. Regarding the inclusion of the historical context the thesis moves onto the crisis which occurred in June 2013 due to inconsistent government interferences in the media field, which led to a suspension of the transmission of the Greek public broadcaster ERT. The practical part is dedicated to a detailed analysis of the viewership of the Greek television, focusing on the period before, during and after the crisis had occurred. The main objective of the thesis is to point out whether the government interferences had influenced the viewership of the Greek television.
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Application of electrical resistivity tomography technique to detect underground cavities
Kučera, Radek ; Hartvich, Filip (advisor) ; Široký, Jakub (referee)
The electrical resistivity tomography (ERT) method is widely used to detect underground cavities because their air, water or clay infill often has a significant geoelectrical contrast to the surrounding rock. The review part of this study summarizes properties of the method and presents examples of investigation of underground cavities in various geological settings, mainly the crevice-type and karst caves and old mining objects. The case study from the Amatérská cave in the Moravian Karst proved the ability of the technique to detect air and clay filled underground cavities above the depth of 40 m. The resolution of the method is lower at greater depths but some indication of deeply situated Pustožlebská Zazděná and Amatérská caves was captured. Keywords: ERT, underground cavities, caves, Moravian Karst
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Escalation of the crisis in Greek public broadcasting television in 2013-2014
Srpová, Zuzana ; Köppl, Daniel (advisor) ; Štoll, Martin (referee)
The main topic of this thesis is the functioning of the public service media, especially public service television broadcasters. After general definitions of the basic terms associated with this topic, the thesis highlights the differences between the media in the private and the public sectors, and characterizes the public service media in the previously selected European countries: the United Kingdom, Germany, Italy and the Czech Republic. The choice of these particular states was based on their different economic, political and media systems. The history, the development and the crisis of the Greek public service media are subjected to a thorough analysis. Regarding the inclusion of the historical context the thesis moves onto the crisis which occurred in June 2013 due to inconsistent government interferences in the media field, which led to a suspension of the transmission of the Greek public broadcaster ERT. The practical part is dedicated to a detailed analysis of the viewership of the Greek television, focusing on the period before, during and after the crisis had occurred. The main objective of the thesis is to point out whether the government interferences had influenced the viewership of the Greek television.
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Using ERT and GPR in polygonal patterned ground analysis
Široký, Jakub ; Křížek, Marek (advisor) ; Hartvich, Filip (referee)
Polygonal cryogenic structures cannot be investigated with conventional methods as they could be harmed during measurement. A real3D GPR and ERT non-destructive surveys were used to examine and prove applicability for topsoil covered ice-wedge pseudomorphs and coarse-grained sorted polygons (patterned ground). A list of processing tools and algorithm suitable for such environments was created and tested. The benefits of 3D measurements are illustrated on horizontal slices and pseudo3D visualisation of 3D Cube. Basic morphometry characteristics of both forms were collected. Abilities of geophysical imaging for advanced shape characterisations are discussed, too. The low-frequency measurements gave better results at both sites. Pseudomorphs, 2 wide and up to 6,5 long, were found penetrating depth bigger than 3,5 . Sorted polygons, 2,5 wide in diameter, were depicted locked by stony ring of width around 1 . Sorting depth extends up to 0,54 depth for sure, perhaps more.
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Analysis of the subsurface struckutes location in representative transections of the research catchments
DUBEC, Štěpán
This theses is focused on the description of subsurface in the area of interest - Kopaninský and Jenínský stream catchment - and consequently thy most accurate interpretation depth of impermeable bedrock. Geophysical multicable metod (ERT - electrical resistivity tomography") was selected for field measurements. This method of geophysical survey provides the information on subsurface structures, verifies hypotheses and brings new information on the lithological and structural conditions below the surface. ERT measurements were performed automatically by geoelektrical ARES device in combination with inteligent electrodes. The data obtained by field measurements were plotter in the form of resistive sections (using ReS2DInv software) which were used for the later interpretation. The given results determine the depth and process of impermeable bedrock which are important for more accurate data inputs like for modeling rainfall-runoff processes especially in the field of calibration and validation of each adjustment of models as well as for the next other hydrogical analyzes and studies carried out in the research projects. The purpose of this work is to determine the depth of impermeable bedrock and could serve as a data input for MIKE SHE hydrological modeling.
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