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Sapping- its field features and studies focused on detail description of the process
Soukup, Jan ; Bruthans, Jiří (advisor) ; Schweigstillová, Jana (referee)
The study discuss about groundwater sapping erosion, whereas is upon process looked from various points of view. In small scale it observes difference between sapping drainage network and network formed by surface runoff. Further forms of the sapping weathering are described and are mentioned examples of sapping valleys from different places around the world. Partially are mentioned actual knowledge in evolution of deep incised valleys on the Mars surface, which are obviously also formed partly by sapping. In the second part, study describes some experiments focused on evolution of sapping valleys in laboratory environment.
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The analysis of river network evolution in Ethiopian Highland
Maca, Vít ; Vilímek, Vít (advisor) ; Kliment, Zdeněk (referee)
Ethiopian highlands is one of the most various tectonic areas in the world. It lies in close proximity to Ethiopian rift system in areas with volcanic landscape. As the main factors involved in development of river networks have been identified: volcanism, tectonics, erosion. The most important factor is the erosion, that work pays closer. Using the methods of remote sensing, GIS analysis and documenting the longitudinal and transverse river profiles were surveyed area of differentiation in the types of river networks, deep of river valleys, geological strata, etc. GIS and remote sensing analysis provided more supporting data. Crucial is the analysis of the longitudinal profiles. Five rivers was profiled: Guder, Muger, Jemma, Birr, Blue Nile. Knickpoints in profiles were identified and were divided into three types according to the majority factor involved in the formation: Active uplift entire Ethiopian highlands which activizate river erosion, active uplift smaller areas, lithological. Crucial for next outputs are knickpoints linked to active uplift entire Ethiopian Highland. Lokalization of thats, were profiles divided into subprofiles, representing phasis of erosion development of entire area. During the past 31 million years, were identified 3 phases with increasing incision rates. Furthermore,...
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Optimization of digital river network and its impact on catchment water management
Hošek, Zdeněk ; Matoušková, Milada (advisor) ; Šípek, Václav (referee)
Digital river network dataset is an important source of information in any aspect of water management decision making. It is also a base for modelling or scientific research in many different fields. Development of the dataset in the Czech Republic had been fragmented in a past and as a result three different datasets have been developed that cover the whole of the state's territory. The datasets contain different geometries, different and often conflicting attributes and serve different purposes. Today the time has come that water management decision makers have realised that the situation is no longer sustainable and make effort to merge the datasets into one. The task brings in several technical issues and a potential for severe legal consequences. The aim of this study is to develop a methodological approach to merging the existing datasets into one. This methodological approach to decision which of the conflicting or different attributes should be adopted is based on assumption that the existing datasets will be merged into one consisting the best of all. Comparison of features in the existing dataset will inevitably lead to many conflicts when it will be necessary to decide which of the considered features should be adopted to the resulting dataset. The study considers the main purposes which...
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Assessment of anthropogenic modification of the river network using hydromorphological survey as an example of the upper Metuje River
Kavalír, Václav ; Matoušková, Milada (advisor) ; Kujanová, Kateřina (referee)
Human modifications and related pressure on watercourses of its ecosystem became greatly discussed problematic in the latest dry years. The translated bachelor's thesis deals with these encroachments on watercourses as well as with its impact on hydromorphological quality. In recherché there are discussed basic hydromorphological knowledge and modifications of watercourses with its negative and positive effects on the watercourse along with its surrounding. For the evaluation of the hydromorphological condition was used HEM methodology (Langhammer 2014) applied on upper course of the Metuje River. Overall, based on the outcome of the HEM methodology the upper stream of the Metuje River is evaluated as a weakly modified. Less disturbed sections can be found in the area of the National Nature Reserve Adršpašsko-Teplické skály. The largest modifications can be seen in the build-up areas of Teplice nad Metují, where these modifications come particularly from the period of the First Republic. The area of the floodplain, is the most affected area. Trace of the rivercourse was overall shorted by 1 569 meters, therefore 7,5 % since mid-19th century, chiefly in the surrounding of Teplice nad Metují. The greatest concentration of diverse modifications is in the build-up zones. Key Words: Hydromorphology,...
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Optimization of digital river network and its impact on catchment water management
Hošek, Zdeněk ; Matoušková, Milada (advisor) ; Šípek, Václav (referee)
Digital river network dataset is an important source of information in any aspect of water management decision making. It is also a base for modelling or scientific research in many different fields. Development of the dataset in the Czech Republic had been fragmented in a past and as a result three different datasets have been developed that cover the whole of the state's territory. The datasets contain different geometries, different and often conflicting attributes and serve different purposes. Today the time has come that water management decision makers have realised that the situation is no longer sustainable and make effort to merge the datasets into one. The task brings in several technical issues and a potential for severe legal consequences. The aim of this study is to develop a methodological approach to merging the existing datasets into one. This methodological approach to decision which of the conflicting or different attributes should be adopted is based on assumption that the existing datasets will be merged into one consisting the best of all. Comparison of features in the existing dataset will inevitably lead to many conflicts when it will be necessary to decide which of the considered features should be adopted to the resulting dataset. The study considers the main purposes which...
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Keeping linear objects of transport and river networks
Vojtíšková, Zuzana ; Šára, Pavel (advisor) ; Kufner, Jan (referee)
The goal of this work is to describe and evaluate keeping linear objects of transport and river networks. The first part is devoted to objects with line geometry in some Czech and foreign databases, the method of keeping them is described and evaluated using examples of some Czech databases. Some terms related with the topic of the bachelor thesis are described before the practical part in which a way of keeping the networks is suggested and realized.
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The analysis of river network evolution in Ethiopian Highland
Maca, Vít ; Vilímek, Vít (advisor) ; Kliment, Zdeněk (referee)
Ethiopian highlands is one of the most various tectonic areas in the world. It lies in close proximity to Ethiopian rift system in areas with volcanic landscape. As the main factors involved in development of river networks have been identified: volcanism, tectonics, erosion. The most important factor is the erosion, that work pays closer. Using the methods of remote sensing, GIS analysis and documenting the longitudinal and transverse river profiles were surveyed area of differentiation in the types of river networks, deep of river valleys, geological strata, etc. GIS and remote sensing analysis provided more supporting data. Crucial is the analysis of the longitudinal profiles. Five rivers was profiled: Guder, Muger, Jemma, Birr, Blue Nile. Knickpoints in profiles were identified and were divided into three types according to the majority factor involved in the formation: Active uplift entire Ethiopian highlands which activizate river erosion, active uplift smaller areas, lithological. Crucial for next outputs are knickpoints linked to active uplift entire Ethiopian Highland. Lokalization of thats, were profiles divided into subprofiles, representing phasis of erosion development of entire area. During the past 31 million years, were identified 3 phases with increasing incision rates. Furthermore,...
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Morphostructural analysis of the Hřibovská hornatina
Stemberk, Jakub ; Štěpančíková, Petra (advisor) ; Roštínský, Pavel (referee)
Morphostructural analysis of the Hřibovská hornatina Mts. This work deals with morphostructure analyses of the Hřibovská hornatina Mts., part of the Rychlebské hory Mts. Northeastern border of the studied area is created by the mountain front slope controlled by the Sudetic Marginal fault, which is one of the most conspicuous tectonic structures in central Europe. This is the main reason why works were focused on the analyses of stream network parameters and spatial distribution of those selected landforms which could potentially indicate recent tectonic activity in the studied area. As a result, supposed courses of faults marked in morphology were suggested. Fault activity assessment was considered on changes in erosion intensity indicated in longitudinal and crosswise profiles of stream valleys. Based on the values of Stream-Length index the areas with recent tectonic activity were delimited. The final output of this work is the morphostructure map of the Hřibovská hornatina Mts. and the adjacent area. Key words: Morphostructural analysis, active tectonics, Sudetic Marginal Fault, Hřibovská hornatina Mts.
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Differences in morphology of the valleys in the Jizerské hory Mts.
Hložek, Martin ; Engel, Zbyněk (advisor) ; Hartvich, Filip (referee)
This Master thesis focuses on a river network characteristics in the Jizerské hory Mts., northern Bohemia. This part of the Czech Republic represents an area, which was during Tertiary and Pleistocene affected by neotectonic movements. Therefore, 30 longitudinal profiles of selected rivers were constructed to determine areas influenced by tectonics most intensively. These profiles were classified into four categories according to shape of profile curve. Also valley cross sections were made on five selected rivers. Additionally, the Jizera and Jizerka rivers were studied to assess changes of their streams in the period of 19382012. On the north-western (the Jeřice river catchment) and northern (the Smědá river catchment) slopes of the Jizerské hory Mts., areas most affected by neotectonic movements were detected. Tectonically controlled valley cross sections are distinctive on the Smědá, Jizera and Kwisa rivers. On the Jizerka and Jizera rivers, lateral erosion rate ranges up to 0,5 m/year.
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Sapping- its field features and studies focused on detail description of the process
Soukup, Jan ; Bruthans, Jiří (advisor) ; Schweigstillová, Jana (referee)
The study discuss about groundwater sapping erosion, whereas is upon process looked from various points of view. In small scale it observes difference between sapping drainage network and network formed by surface runoff. Further forms of the sapping weathering are described and are mentioned examples of sapping valleys from different places around the world. Partially are mentioned actual knowledge in evolution of deep incised valleys on the Mars surface, which are obviously also formed partly by sapping. In the second part, study describes some experiments focused on evolution of sapping valleys in laboratory environment.
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