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Evaluation of the river system of the Odlezelské (Mladotické) Lake basin as a potential source for sediment transport
Mužák, Petr ; Kliment, Zdeněk (advisor) ; Šobr, Miroslav (referee)
The status of the river network is essential to understanding the fluvial system of the basin. Erosion and accumulation activities of the river system led to changes in the river channel which caused the increased sediment transport and contributed to the silting of the Odlezelské (Mladotické) Lake. This study aimed to evaluate the status of the river system of the Odlezelské Lake basin and to identify and characterize its erosion and accumulation of landforms. The field survey of the Odlezelské Lake basin applied the hydro morphological characteristics monitoring (HEM) method extended by the record of erosion and accumulative landforms. The Mladotický stream recorded the highest representation and area concentration of erosion landforms. The Potvorovský stream showed the highest density of accumulation of landforms. Anthropogenic activity changed the mapped part of the lake basin in 47 percent of sections which exhibited a lower degree of erosion and accumulation of landforms. Beaver population activities also significantly influence the fluvial dynamics of the river system. Keywords: river channel, fluvial dynamics, sediment transport, Odlezelské (Mladotické) Lake
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Analysis of fluvial dynamics of montane stream using UAV
Šolc, Jakub ; Langhammer, Jakub (advisor) ; Hartvich, Filip (referee)
6 Abstract In recent decades the field of fluvial geomorphology has moved towards the most detailed and comprehensive description of the processes in fluvial systems. The recent development of UAVs (Unmanned Aerial Vehicles) has been a major contribution in analysis of fluvial processes, it provides very detailed data for change analysis. This thesis deals with the analysis of recent fluvial dynamics using UAV. The theoretical part of the thesis summarizes the current theoretical and methodological knowledge from the study of fluvial dynamics and also presents the general principles of UAV monitoring with its use in fluvial-geomorfological research. Recent fluvial dynamics was evaluated in the stretch of Javoří brook in Šumava Mountains where the long-term research is conducted by the Department of Physical Geography and Geoecology. Causal runoff events with an impact on fluvial dynamics were identified on the basis of the analysis of hydrometeorological data covering hydrological years from 2016 to 2020. A total of fourteen events exceeded the threshold of channel-forming discharge Q = 5,041 m3 ·s−1 in the investigated period. Geometrical, morphological and volume changes were evaluated based of the photogrammetric reconstruction of the riverbed during three successive scannings (2015, 2018, 2020). The...
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Extreme hydrological events in the Rolava River basin
Vlach, Vojtěch ; Matoušková, Milada (advisor) ; Blahušiaková, Andrea (referee)
6 Abstract This bachelor thesis deals with characteristics of extreme hydrological events in the Rolava river basin, which is located in the Ore Mountains in northwestern part of Czech Republic. The main aim of this study is a comparison of hydrological extremes in headwater catchments of Rolava River and Slatinný brook using data from the experimental monitoring of Department of Physical Geography and Geoecology, Faculty of Science, Charles University in Prague and Czech Hydrometeorological Institute. The other object is a field survey of the impacts of hydrological extremes on fluvial-morphological dynamics of the streams, focused on river-bed forming processes. The opening part of this thesis deals with the physical geographical and hydrographical characteristics. The main part is devoted to the comparison of extreme events in the monitored catchments focusing on floods and drought. As a final result, it was found out that Slatinný brook has a greater tendency to extremity of peak discharges. Another part of the results is an analysis of the five-year flood seasonality change on upper course of the Rolava River in two periods 1967-1990 and 1991-2014. Key words: extreme events, flood, drought, fluvial dynamics, Rolava, Slatinný brook
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