|
|
Relative age dating of moraines in selected High Tatras valleys
Procházková, Barbora ; Křížek, Marek (advisor) ; Vočadlová, Klára (referee)
The submitted diploma thesis deals with relative dating of the youngest glacigenic sediments (moraines) in the upper parts of some selected valleys in the High Tatra Mountains. These moraines were stabilized after the last cold events of the last glaciation cycle. The Schmidt hammer (SH) test was used for the assessment of their relative age. This method is based on the assumption that there is a mutual relation between the degree of weathering of a tested surface and the duration of its exposure. Information about the degree of weathering is expressed by the Rebound (R) value. The measurements were taken on fifteen moraines in four valleys in the High Tatra Mountains (Mengusovská, Velká Studená, Malá Studená and Litvorova valley). A large statistical population of measurements obtained from moraine surfaces were used to analyse the variability of R values means in the same lithology. The moraines were divided on the base of SH measurements into two groups of different age. R value means and standard deviation for these groups (SK_1: R=53,5±1,2 a SK_2: R=58,6±1,5) are significantly statistically different. The results of the weathering indexes were used for the reconstruction of the pattern of deglaciation in selected upper parts of valleys (cirques). Key words: relative dating, the Schmidt Hammer,...
|
|
|
The main forms of Martian relief and their relevance to observing the dynamics and development of Martian surface
Žížalová, Ivana ; Křížek, Marek (advisor) ; Kalvoda, Jan (referee)
Bachelor thesis deals with the main forms of Martian surface and with the processes which have or used to have an impact on the planet. Using various scientific publications and articles a creative research was done in order to briefly introduce the forms of surface of Mars. How and when were these forms created, what condition is the surface in today and how it differs from equivalent forms on planet Earth or other terrestrial bodies. A certain analogy was discovered between the shapes found on Mars and on planet Earth, as well as certain differences - Mars only has eolian, periglacial and glacial processes forming its relief. The distinctions are caused both by the characteristics of the environments and by a different geological development.Since there is not many publications dealing with this issue in Czech language, the main benefit of this work is to mediate information on the surface of Mars to the general public which does not dispose of knowledge of foreign languages. Key words: Mars, surface of Mars, endogenous processes, exogenetic processes
|
|
|
Spatial distribution of erosion and accumulation landforms within the river channel depending on the channel course and barriers for various large river
Marková, Jana ; Křížek, Marek (advisor) ; Hartvich, Filip (referee)
The subject of the diploma thesis is the change in the spatial distribution of erosion and sediment deposition landforms within the channel of four different-size rivers, and is based on the morphology of the river channel and presence of barriers. The objective of this thesis was to 1) map the spatial distribution of channel bars and locations of bank scour, 2) define the morphologic characteristics including the position with respect to the location of bends and obstructions in the channel of the individual river reaches, and 3) define common patterns, and explain potential differences between the patterns in the rivers of different size. For the purpose of this study a field reconnaissance was carried out on selected reaches of Sazava River, Litavka River, Kocaba River and Lodenice River. The selected sections represent relatively natural parts of river channels with similar geomorphic conditions. The field survey was carried out in two campaigns - in spring and in summer 2015. The results of the survey indicate that channel bends do not play a primary role in the position and morphology of channel bars and locations of bank scour. However, significant sediment deposition or erosion activity was identified near run-of-river dams. In the surveyed reaches of the Sazava and Litavka rivers, channel...
|
|
|
Morphometric variability of selected types of valley networks
Albert, Daniel ; Křížek, Marek (advisor) ; Hartvich, Filip (referee)
The bachelor thesis is engaged in morphometric characteristics used for valley nets analysis and comparing values of this characteristics for individual types of valley networks. Based on the search of the books and articles there was created a summary of morphometric characteristics and then, for compare purposes, there were selected these features: weighted bifurcation ratio, mean length ratio, drainage density, drainage texture, form factor and circularity ratio. These features were calculated for real types of valley networks in different parts of the world. The data were obtained from vectorization of these nets in ArcGIS programme. In conclusion there are results confronted with morphometric analysis of selected types of valley networks in Czech republic. Key words: valley, valley network, types of valley nets, geomorphometry, morphometric analysis, morphometric charasteristics, bifuraciton ratio, lenght ratio, drainage density, drainage texture, form factor, circularity ratio
|
|
| |
|
|
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.
|
|
|
Spatial distribution of vegetation species on the earth hummocks on Mt. Keprník and Mt. Praděd in the Hrubý Jeseník Mts.
Kodríková, Anna ; Křížek, Marek (advisor) ; Sklenář, Petr (referee)
This thesis focuses on spatial distribution of vegetation species on the earth hummocks on Mt. Keprník and Mt. Praděd in the Hrubý Jeseník Mts., the relationship of the spatial distribution of vegetation to windward and leeward effect, and also on the morphological characteristics of earth hummocks. The windward and leeward effect was studied not only on the earth hummocks themselves, but also in the whole study area. The succession of vegetation, which reflects an activity of earth hummock and a level of their development, was also concerned. Earth hummocks are nonsorted patterned ground types. Vegetation on earth hummocks affects not only their formation, but also their shape and internal characteristics. Further,vegetation reflects certain properties of earth hummocks (moisture, soil characteristics etc.), and also ecological conditions which affect earth hummocks (wind impact, distribution of snow cover etc). Each studied earth hummock was first measured (length, width and height) in the field and then was divided into quadrants according to the efect of wind (windward quadrant oriented SW, windward quadrant oriented NE, and two remaining quadrants oriented NE, NW) in which phytocenological surveys were carried out. The results show that the vegetation on earth hummocks is strongly efected by...
|
|
|
GEOMORPHOLOGICAL TERMS IN THE CONTERPORARY CZECH TEXTBOOK FOR HIGHER CLASSES OF SECONDARY GRAMMER SCHOOLS AND HIGH SCHOOLS
Lukášová, Vendula ; Křížek, Marek (advisor) ; Matějček, Tomáš (referee)
With a various geomorphological terms meets each of us, for everybody it is good to know at least a basic geomorphological terms. In Czech schools geomorphology is taught in geography. This work studies the geomorphological terms in Czech secondary school geographical textbooks. The aim of this work was to evaluate textbooks in terms of quantity, but also quality of geomorphological terms. Selected books were from year 1989 till today, had different topics and they were designed for different types of secondary schools. The book evaluation was based on several criteria, subsequently was made a simple statistical analysis. The results of the work can help middle-school teachers to decide for the right textbook used for teaching geomorphology. Keywords: geomorphological terms, textbooks, evaluation.
|
|
|
Relief evolution in region of the Siljan impact crater
Lulák, Martin ; Kalvoda, Jan (advisor) ; Křížek, Marek (referee)
Impact events and associated processes can significantly reshape the natural environment of the Earth and other bodies in the Solar system. The Siljan impact crater in the middle of Sweden was created in late Devonian and it is the biggest known morphostructure of this kind in Europe. The presented paper aims at the relief evolution of the Siljan impact crater area. Landforms of the region are studied, including relicts of the impact event, and main stages of relief evolution from the Paleozoic to the present are determined. Special attention is focused to discussion about the range and types of erosional and denudational processes in relation to the level of preservation of morphological and geological indices about the Devonian impact. Ascertained knowledge about relicts of the Siljan impact event are compared with selected impact craters on the Earth, the Moon and Mars.
|
|
|
Variability of glaciofluvial sediments micromorphology
Krbcová, Klára ; Křížek, Marek (advisor) ; Lisá, Lenka (referee)
Micromorphology of glaciofluvial sediments were only partially shown by Mahaney et al. (2001). This paper deals with the main diagnostic textures of glaciofluvial sediments and changes of their micromorphology caused fluvial transport. The samples were collected. All samples were collected by Peter Mida and Martin Hanáček in Svalbard in August 2012. Two glacial samples and six glaciofluvial samples were taken near the glacier Bertilbreen and one glacial sample and seven glaciofluvial samples were taken near the glacier Hørbyebreen. Samples were examined under electron microscope. The correlation analyses was used to set the main glaciofluvial microtextures. Similarity of the samples was tested by one-way ANOVA. Increasing numbers of V-shaped pits, rounded grains, meandering ridges and microblocks are typical for characteristic microtextures of glaciofluvial grains which had greater rate of fluvial transport. But the grains mainly transported by glacier had a greater percentage occurence of subangular grains, straight steps, straight and curved grooves, adhering particles, pitting and V-shaped etch pits. Keywords: exoscopy, quartz grains micromorphology, glaciofluvial sediments
|
guest ::
RSS feed.