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Hydraulic Jump Energy Dissipation in the channel extension
Pospíšil, Radek ; Haluza,, Miloslav (referee) ; Šulc, Jan (advisor)
The diploma thesis is focused on the evaluation of the suppression of supercritical current energy in the area of the river bed extension. The hydraulic model was used to simulate current conditions for different variants of river bed arrangement. Individual variants were then evaluated according to the relevant criteria and compared with each other. Results can be applied in hydrotechnical practice based on model similarity.
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Assessment of macroinvertebrates diversity in contex of physical river habitat quality
Nováková, Barbora ; Matoušková, Milada (advisor) ; Havlíková, Petra (referee)
Research of macroinvertebrates is currently an important part of the assessment of stream quality. Basic characteristics influencing macroinvertebrates communities in the streams are elements from the external environment influencing streams, specifically basic geographic parameters of the site, land-use in the catchment and characteristics of the banks. These elements have a considerable influence on effect of the basic parameters in the stream, which are flow, sediment structure, input of organic material and pollution. Research part of the thesis is about the parameters influencing macroinvertebrates communities. Research area of this work includes three different catchments in the upper part of Blanice catchment area near Prachtice. There is one nature stream with forest in it's catchment, stream with a predominantly meadow basin and last stream is characterized by two distinct stretches - a revitalized section and a section with concrete bottom. The subject of this diploma thesis is evaluation of diversity of macroinvertebrates communities in all streams in the research area. Thesis evaluate communities of macroinvertebrate using a wide range of indexes (BMWP score, ASTP index, EPT index a diversity indexes) and compares their diversity by using rank-abundance graph. All results are summarized...
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UAV photogrammetry as tool for evaluation of fluvio-morphological changes of streams
Lörinc, Michal ; Langhammer, Jakub (advisor) ; Hartvich, Filip (referee)
This thesis is focused on a use of a technology that is relatively new and popular in geoscience applications, including the fluvial dynamics research. Unmanned aerial vehicles are becoming widely used in numerous geographical subdisciplines due to their capabilities and advantages of UAV imaging in comparison with other remote sensing techniques. These advantages and also limitations together with general characterization of UAVs are summarized in the secondchapter of the thesis. The following theoretical chapters deal with basics of UAV photogrammetry and also evaluate the potential of UAV imaging in fluvial geomorphology. The fifth chapter of the thesis comprises a case study that evaluates the use of an UAV equipped with a non-metric camera for fluvial environment reconstruction. Images of Javoří potok have been processed in Agisoft PhotoScan and ArcGIS to indicate geomorphological changes of the stream channel that happened during a 5 month period from November 2014 to April 2015. Keywords: UAV; photogrammetry; fluvial geomorphology; hydrology; channel
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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...
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Changes of physical river habitat in the Prague city area. Case study area of the Botič catchment.
Tichý, Vojtěch ; Matoušková, Milada (advisor) ; Kliment, Zdeněk (referee)
During the last 200 years third of all watercourses in Czech republic were modified, stress were massively degraded especialy in the urban areas. The increasing urbanization of the landscape has led in recent years to increased researsch ecology of urban environment, this created the need for quality assesment of watercourses. This bachelor thesis deals with anthropogenically modified flows, quality and change of physical habitat watercourses in urban areas. The main objective of this work is the evluation and presentation of the results of the field survey that was conducted in the Botič river basin using the metodology HEM and HEM-F. Field survey was conducted in the lower reaches of Botič below the Hostivař dam (river km 0,00 to 13,30 km). This section has been most modified in the past, notably in the context of urbanization. In addition to the hydromorphological condition were also mapped fluvial-morphological effects of flood 2013. Based on the evaluation results of the field survey the majority of segments were classified as poor or bad.
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Actions on bridges caused by the water flow and floating items
Řezník, Jindřich ; Duchan, David (referee) ; Špano, Miroslav (advisor)
The subject of this thesis is the enumeration and analysis methods applicable to the calculation of loads on bridges from water and water-borne objects. It involves a hydrodynamics loads, loads from captured debris and from impacts of the individual water-borne objects and their clusters. It includes an assessment of the current situation, the teoretical analysis and model calculations on the concrete bridge with the evaluation of usable methods.
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Studie protipovodňové ochrany části povodí Litavy
Slezák, Pavel
The thesis Study of flood prevention in a part of the Litava river catchment describes flood prevention built in May 2012, based on charting of the target location in the area of Slavkov u Brna town. The bulletin of the thesis describes characteristics of the flood, historical events of the most important flood in Czech republic and the topic of flood is debated as well. It also includes flood prevention characteristics. The next part of the thesis analyzes the target area and the flood which happened in Slavkov in 2010. It describes the catchment of Litava river which lies in South Moravia region. The main part if the thesis describes flood prevention systems built in the target area. The last part of the thesis describes current flood prevention systems, concept and suggestions of possible improvements in the Slavkov town.
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Production trough wiring
Broža, Pavel ; Císařová, Michaela (referee) ; Lidmila, Zdeněk (advisor)
The thesis introduce a proposal of technology production shape components by shearing and bending. The specified component will be made from galvanized sheet DX51D + Z 275 with a thickness of 2 mm. On the basis of literary studies and calculations was determined shearing by simple stamping and bending on press brake. For the production were selected eccentric press EZN 6 with a nominal force of 320 000 N and press brake MENGELE 50/2050 with a bending force 500 000 N. Technological proposal is supported by the attached drawings.
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Flood protection of Hustopeče nad Bečvou
Jauernig, Jan ; Petr, Jiří (referee) ; Jandora, Jan (advisor)
This thesis deals with flood protection of the Hustopeče nad Bečvou. The work is divided into three parts. The first part describes the data necessary for the design of flood protection measures. The second part describes the hydrotechnical calculations and the third part describes proposals for flood protection.
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Design of methodology for determining roughness coefficient of open channels
Smelík, Lukáš ; Havlík,, Aleš (referee) ; Šoltész,, Andrej (referee) ; Uhmannová, Hana (advisor)
Determination of immeasurable parameter, the Manning’s roughness coefficient, is a complex problem of open channel hydraulics for more than 200 years. Now it doesn’t exists a method for determining an exact value of 1D roughness coefficient for computation water levels in watercourses. Doctoral thesis is focused for comparing different approaches to determine a roughness coefficient, especially for empirical equations. It were sought empirical equations, which are suitable for wide spectrum of water stages, types of bed material, channel shapes and channel dimensions. Selected equations were sorted on the base of two methods by the best values of medians and standard deviations of measured and computed values of roughness coefficients. Furthermore, it were compared qualities of roughness coefficient determination by tables, by photographic catalogs, CES software and by Cowan’s method, which has been extended and recalibrated. The computed values of roughness coefficients by those four methods were compared with values from own measurements in 27 locations in watercourses near of Brno and Frýdek-Místek. Also it were compared the grain size curves determined by sieving, by Wolman’s method and by Subjective estimation. Doctoral thesis is marginally focused for beginning of sediment movement, roughness coefficient of bedforms (dunes), grass and trees.
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