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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
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Automatic classification of valley-networks types in the Czech Republic
Albert, Daniel ; Křížek, Marek (advisor) ; Lysák, Jakub (referee)
Valley-network type is a system of valleys forming some specific planform pattern. The pattern itself gives an information about the character of the terrain - rectangular type of network indicates tectonic disruption, trellis type indicates layers of different rock resistance, parallel type indicates steep slope and dendritic type indicates homogeneous lithology. These predispositions are general and are not valid for every single type of valley network, but classification of some compact area based on those four basic types could reveal its lithological-tectonic conditions. In order to make such classification correct and minimize the degree of subjectivity, an automatic classification is the best option. Valley networks in the area of the Czech republic have not been classified yet. So main aim of this master thesis is to create a suitable method of an automatic classification of the focused area. This classification method works with concrete geometric and topologic indicators which are: junction angle, sinuosity, length ratio, catchment elongation and elongation ratio. Key words: valley, valley network, drainage pattern, dendritic pattern, parallel pattern, trellis pattern, rectangular pattern, geomorphometry, terrain analysis, ArcHydro, automatic classification, morphometric indicators,...
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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
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