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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Spatial and morphometric features of thermal contraction crack polygons on Mars
 Žížalová, Ivana ; Křížek, Marek (advisor) ; Brož, Petr (referee)
The aim of this thesis is to analyze zonality of the thermal contraction crack polygons on the surface of Mars. Their morphology and its variation are analyzed in relation to the latitude of Mars. For spatial and morphological analysis were selected 64 images from the HiRISE (Mars Reconnaissance Orbiter) polychromatic camera dataset, images are covering the bandwidths proportionally. Images were first visually analyzed using HiView. 258 areas containing the thermal contraction crack polygons (with total area of 1184 km2 ) and 1036 well developed thermal contraction crack polygons were further vectorized using ArcMap. The thermal contraction crack polygons were found in every searched latitude which proves the ubiquity of permafrost. The largest amount of the thermal contraction crack polygons have been found in latitudes ±60ř and 45ř. In these latitudes were also found the largest and probably the deepest thermal contraction crack polygons (average length ranges from 42,1 - 73,6 m). The smallest polygons (average length 7,7 m) were found around the equator. "Altitude" has no effect on the spread of the thermal contraction crack polygons on Mars; however it has the effect on its morphology. The most widespread are pentagonal polygons, which occur mainly in the southern hemisphere. The next most...
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Paleoenvironmental significance of frost and ice wedges
 Friedlová, Zuzana ; Křížek, Marek (advisor) ; Engel, Zbyněk (referee)
- Paleoenvironmental significance of ice and frost wedges This bachelor thesis deal with frost wedge and ice wedge pseudomorphs. At first part is summarized how and from are pseudomorphs formed. Therefore there is describe distribution and structure of permafrost, frost cracking, definition of ice wedges, their kinds and their transformation to pseudomorphs. Next part of this bachelor thesis describes morfological characteristic of polygons of frost wedge pseudomorphs at study area Šaratice. This polygons were compared with european pseudomorphs a then was deduced paleoclimatical and paleoenvironmetal reconstruction of their formation. Pseudomorphs are compared from their morphological characteristics too. Keywords: ice wedges, frost wedges, pseudomorphs of wedges
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