National Repository of Grey Literature 15 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
Verification of the "Čirá - Kopanina" fault existence using morphostructural analysis and geophysical surveying
Findžová, Leona ; Tábořík, Petr (advisor) ; Kašing, Martin (referee)
This thesis focuses on the verification of the Čirá-Kopanina fault existence using morphostructural analysis and geophysical surveying. The verification of the fault zone was based on the analyses of the digital relief model, river network parameters and selected relief features that indicate tectonic activity with a high probability. Based on these analyses, the fault was identified and subsequently verified using geophysical methods. The searched tectonic line passes through the village of Čirá in the Jindřichovice upland district (Krušné hory Mts), continues east of the village of Kopanina and heads south into the Cheb Basin along the Libocký Brook. The direction of the Čirá-Kopanina fault was determined as approximately north-south (348ř - 168ř) and thus corresponds to the north-south orientation of the hypocentres of the West Bohemian earthquake swarms. The Čirá-Kopanina fault zone could thus be a potential source area for the earthquake swarms at the boundary of the Cheb Basin and the Krušné hory Mts. crystalline complex. However, its activity needs to be verified by a further research. Keywords fault, tectonics, digital elevation model, morphostructural analysis, geophysical surveying, Jindřichovice uplands, Krušné hory Mountains
Ground-penetrating radar in peri/glacial environments
Bartůšek, Filip ; Engel, Zbyněk (advisor) ; Tábořík, Petr (referee)
Ground penetrating radar (GPR) technique is a non-invasive geophysical method based on sending an electromagnetic signal into the ground and evaluating it after reflection from subsurface structures. The Georadar method is used to study a large number of geomorphological phenomena. This paper focuses on defining the potential applications of GPR in periglacial and glacial environments. Based on a literature search, an overview of GPR applications in periglacial and glacial environments was developed. Attention was also paid to the suitability of individual environments for GPR surveys and the advantages and limitations of GPR method in cryogenic phenomena research. In periglacial environments, GPR is most commonly used for active layer delineation and ground ice detection, but the depth range is limited by the presence of liquid water in the active layer. In glacial environments, GPR is most often used to measure the thickness of glaciers and to image their structure. Ice is the most suitable of all materials (except air) for radio signal propagation and the depth range of the signal in ice is many times greater than in other materials. Key words: Ground penetrating radar, electromagnetic waves, periglacial environments, glacial environments, permafrost, glaciers
ANALYSIS OF A SLOPE DEFORMATION OF THE D11 MOTORWAY CUT
Rotová, Petra ; Tábořík, Petr (advisor) ; Blahůt, Jan (referee)
This diploma thesis consists of a research and a practical part. The research part summarises the problem of slopes movements. The practical part deals with the determination of the slope deformation causes, at the 76th km of the D11 motorway. Causes determination was based on laboratory tests of soil samples taken from the disrupted motorway cut, made at PřF UK soil mechanics lab. Tests of grain size composition were done, plasticity of the L 26 sample was determined and critical strength of the reconstituted L26 and L27 samples was found out in the Translational apparatus box. Soils were categorized due to the according standards and the acquired data were evaluated. In the BricsCAD software, a well arranged locality situation and the slope deformation crosscut underlayed with the geophysical ERT cut were illustrated. In the GEO5 software, slope stability models were created using the Spencer Method of Slices. The slip surface and the groundwater level during the disruption were determined. The practical part also covers a proposal of a remediation appropriate for this deformation and it's modelling in GEO5. For the remediation, the slope stability level is determined. The work is based on the specialized literature, articles, research reports and standards. Powered by TCPDF (www.tcpdf.org)
Field determination of unconfined compressive strength of rocks according to ISO 14689-1
Kuře, Tomáš ; Král, Jan (advisor) ; Tábořík, Petr (referee)
Abstrakt/Summary The aim of the following bachelor thesis is to determine the strength under the uniaxial compression, according to the norm ČSN EN ISO 14689-1. This norm as replaced the norm ČSN 73 1001. Several changes in the rock classification take place in the chapter entitled The Field Determination of Strength Under Uniaxial Compression. Moreover, my own research also address the issue of rock identification and classification. The comparison of the own measurements with the data of laboratory reported in the literature results take place thorough the thesis.
Joint interpretations of geophysical measurements as the key to understand landscape evolution
Tábořík, Petr ; Fischer, Tomáš (advisor) ; Kněz, Jaroslav (referee) ; Putiška, René (referee)
Užitá geofyzika představuje rychlý, efektivní a nedestruktivní způsob získávání informací o složení a stavu horninového prostředí, jakož i o studovaných geologických či geomorfologických procesech. Kombinování různých metod geofyzikálního průzkumu přináší ve srovnání s použitím pouze jedné geofyzikální metody výrazně širší rozsah měřených fyzikálních parametrů, což umožňuje získání mnohem podrobnějších informací o zkoumaném geologickém prostředí. K interpretacím geofyzikálních dat je vždy potřeba přistupovat obezřetně, protože jde mnohdy jen o jedno z pravděpodobných, nikoli však jediných možných řešení. Předkládaná disertační práce na několika vybraných případech ilustruje, jak snadno může dojít k nepřesné, nebo dokonce mylné interpretaci. V řadě případů přitom nemusí jít o problém kvality dat nebo chybného nastavení parametrů výpočetního modelu. Problém nastává při interpretaci výsledků, kdy dochází k přiřazení určité geologické kvality ke konkrétní měřené nebo modelované hodnotě nebo pozorované anomálii. Sdružené interpretace geofyzikálních metod (ideálně doplněné informacemi "negeofyzikálního" charakteru) mohou nejen přinést zásadní informace o studovaných geologických či geomorfologických fenoménech, ale také přispět metodickými poznatky, a to jak k metodám jednotlivým, tak zejména k jejich...
Complex geophysical survey for archaeological purposes in the area of the Chateau Garden in Teplice
Vošvrdová, Eliška ; Dohnal, Jiří (advisor) ; Tábořík, Petr (referee)
This diploma thesis deals with application of geophysical methods in archeology, in the first part by an overview of the methods used for localization and analysis of historical anthropogenic cavities for archeological purposes. In the second part of the thesis, the application of selected methods on a specific locality is described. The initial part of the work summarizes information regarding the geophysical localization of historical anthropogenic cavities, thus underground objects, created by human activity. Their general and physical characteristics are introduced, as well as the specifics associated with their geophysical search, and the principles for choosing a method based on the parameters of the given object. The most frequently used methods in the survey of anthropogenic cavities include gravimetry, geoelectrical DC resistivity methods (symmetric resistivity profiling and electrical resistivity tomography), electromagnetic methods (ground penetrating radar and dipole electromagnetic profiling) and thermometry. A fundamental part of the diploma thesis is devoted to a comprehensive geophysical examination of the archaeological site. The location of the exploration work was the Chateau Garden in Teplice (North Bohemia), below which there are historical cellars. Ground penetrating radar,...
Geophysical imaging of landslides in various geological settings
Haile, Ezra Tadesse ; Valenta, Jan (advisor) ; Tábořík, Petr (referee)
A geophysical survey using the seismic refraction tomography(SRT) was carried out to study a landslide areas in Mekele, Northern Ethiopia as a part of large investigation. The study area is characterized by steep topography and a road cut of Addis Ababa-Tigray main road which has a high economic benefit for the country. In the study areas landslides are one of the most frequent geo-hazard phenomena. They are frequently damaging the road as well as the farming land, mainly during the rainy seasons. The main objective of this investigation is to produce explanatory report providing information about geotechnical properties of rocks and soils and the cause of landslides in the area. The information is utilized for planning a land use and for various kinds of engineering constructions. In addition, the obtained data and interpretation models provides information about construction material resources, identification and remediation of another geo-hazards with impact on the location, design and construction of engineering structures, and selection of potential sites for the ongoing constructions. The landslide material was characterized by a low seismic velocity. A layer of consolidated clastic rocks are considered to be the landslide bedrock and it is represented by a relatively high velocity. The...
Valley evolution of the Biala Lądecka drainage network during late Cenozoic, Lower Silesia, Poland
Stemberk, Jakub ; Štěpančíková, Petra ; Tábořík, Petr ; Coubal, Miroslav
Biala Lądecka (Biala Kłodzka) river is located in Lower Silesia (Poland) and its valley separates Góry Złote Mts.\n(Rychlebské hory Mts.) on the NE from Góry Bialskie Mts. on the SW. We conducted geomorphic investigations on the Biala\nLądecka river basin, in order to determine if Quarternary tectonic activity at the Bělský fault (or near Marginal Sudetic fault) is\ncontributing to the river’s asymmetry. Our research was focused on analysis of selected landforms, DEM parameters,\nmorphometric indexes and their spatial distribution which could potentially indicate recent tectonic activity in the area. At\nselected places geophysical measures were used to discover proper location and structure of Bělský fault or presence of\nsuggested morpholineaments. Preliminary results suggest a Quaternary tectonic activity for the Bělský fault. Moreover we tried\nto clarify nowadays stress regime in study area based striae measurement on fault planes and precise monitoring of selected\nfaults using TM-71 device.
Late Quaternary activity of slow-slip intraplate Mariánské Lázně fault as revealed by trenching and shallow geophysical survey; Bohemian Massif (Czech Republic, central Europe)
Štěpančíková, Petra ; Fischer, T. ; Hartvich, Filip ; Tábořík, Petr ; Rockwell, T. ; Stemberk, Jakub ; Široký, J. ; Sana, Hamid
The NNW-SSE trending Mariánské Lázně Fault (MLF) zone is situated in the western part of the Bohemian Massif (Czech\nRepublic, central Europe) where it intersects NE-trending Cenozoic Eger rift. The northern segment of the MLF controls the\nmorphologically pronounced mountain front of Krušné hory Mts. and eastern limit of Cenozoic Cheb basin, which is famous for\nearthquake swarms (max. ML=4.6) and CO2 emanation. We performed 2D and 3D geophysical survey (electric resistivity\ntomography, ground penetration radar) and 3D trenching to look for large surface-rupturing prehistoric earthquake responsible\nfor pronounced moutain range front. Seven excavated and six hand-dug trenches revealed a complex geology and deformation\nat the study site probably as a result of right-lateral transpression during Late Quaternary. Two Holocene earthquakes 1150-590\nBC and 780-1000 AD were inferred from 14C dating of faulted Holocene colluvium with corresponding magnitudes Mw=6.7-7.0.\nThe latter one is the youngest documented surface-rupturing event in central Europe.\n
GPR data interpretation with use of a combined geoelectrical survey
Široký, Jakub ; Tábořík, Petr (advisor) ; Valenta, Jan (referee)
GPR data interpretation is often difficult due to complex geological environments, reflections ambiguity and time-depth conversion uncertainty. Thanks to the geophysical fields interoperability it is possible to compare results of related survey methods. Radargrams from three model sites were processed and interpreted in an usual way to uniformly amplify all recorded reflections. Results were compared with ERT and EM (DEMP) data within integrated interpretation. GPR data interpretation was extended and new geological and geomorphological interpretations were uncovered. The GPR processing sequence was modified and simplified following outcomes from the integrated interpretation to ease different methods results comparison. Adapting a velocity model to precise time- depth conversion hasn't showed improvements. Key words: ground penetrating radar, electrical resistivity tomography, dipole electromagnetic profiling, integrated interpretation, integrated inversion, GPR processing optimization, sedimentary environment, velocity model

National Repository of Grey Literature : 15 records found   1 - 10next  jump to record:
Interested in being notified about new results for this query?
Subscribe to the RSS feed.