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Establishment of bank slope retreat forecast
Čuda, Ondřej ; Pelikán,, Petr (referee) ; Šlezingr, Miloslav (advisor)
The diploma thesis deals with the assessment of the condition of the bank area of the flooded gravel sand pit Hulín, the subsequent design of active anti-abrasion structures and the determination of the point of maximum retreat of the bank line. As part of the assessment, a personal field trip was carried out, during which, in agreement with the supervisor, a shore section was designated for the subsequent proposal of a stabilization measure and its photo documentation. From the data provided by the supervisor, the characteristics of the waves, the starting length of the wind, the level of the heel of the highest abrasive log house were calculated and the point of maximum retreat of the shoreline in the focused transverse profile of the solved section was determined graphically. Part of the diploma thesis is the design of a total of six active anti-abrasive structures, the construction of which will prevent further retreat of the shoreline and support the creation of a habitat for local animals.
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Návrh stabilizace břehového území nádrže Osvětimany
Svoboda, František
Abstract The bank abrasion disruptive material constitutes banks by mechanical action of the wave, which is carried and deposited at the bottom of reservoir. This effect should be prevented by appropriate stabilization. This bachelor´s thesis is primarily focused on the draft biotechnical stabilization of banks of the selected locality of the Osvětimany water reservoir. The thesis is divided into accompanying report, where the wider territorial relations of water reservoir are addressed and the technical report, where the technical parameters of reservoir and concrete draft stabilizations are summarized. The last part, but not the least part of the thesis, are hydrotechnical calculations, in which the prognosis of bank line retreat was determined.
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Stabilizace břehů údolní nádrže Letovice
Alexová, Ludmila
This thesis is focused on proposals to stabilize the shores of the Letovice water reservoir, damaged by abrasion. Shore abrasion is caused by the action of wind waves and by fluctuations in water levels. Most damaged area is located on the left bank of the reservoir near the Svitavice recreation center. The work is evaluated statistically most frequent level in reservoir for the last ten years. Results of this thesis are determination of abrasion terminant, proposal in particular biotechnical methods of protecting the shores, which are designed to slow or stop the symptoms of abrasion.
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Abrazivní opotřebení termoplastů v zařízeních pro zpracování odpadních materiálů
Slabá, Monika
The thesis deals with abrasive wear of thermoplastics in waste processing equipment. The work describes properties of thermoplastics and abrasion. The extent of abrasion was determined using a unique research equipment called an abrazimeter. Part of the thesis assignment was also the design and construction of the measurement device. The experimental procedures of the thesis describe the measurement and analysis of an abrasive wear of selected materials, i.e., steel 11 373 and polyethylene UHMW from concrete-recycled material. The acquired data were continuously used for optimization of the methodological set up. The aim of this approach was to reproduce the conditions of the real operation. The weight loss of the UHMW polyethylene after 100 hours of operation was twice as high as that of steel 11 373. The measured data were evaluated and statistically processed. The output this thesis may serve as a basis for the further research.
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Development of abrasion-resistant concrete and testing methods
Procházka, David ; Bodnárová, Lenka (referee) ; Hela, Rudolf (advisor)
This diploma thesis deals with concrete abrasion resistance against abrasion. The constructions of transport and water management structures are most stressed by the action of abrasion by means of travel of vehicles and flowing water. Abrasion reduces the durability of the structures. The prerequisites for achieving the best possible abrasion resistance are examined. Furthermore, test methods that are currently used worldwide. The experimental part deals with the influence of individual types of aggregates amphibolite (Želešice), fecal gravel sand (Žabčice) and basalt (Bílčice) on abrasion resistance. Furthermore, the dependence between the strength of the concrete and the hardness of the surface for abrasion resistance. Abrasion resistance testing was determined by concrete abrasion, abrasion resistance by the Böhm method and by water jet.
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Proposal to revitalize the banks of the flooded Hulín sandstones - section 2
Čuda, Ondřej ; Pelikán,, Petr (referee) ; Šlezingr, Miloslav (advisor)
The subject of this bachelor’s thesis is to prevent the retreat of the bank line by the proposal of suitable biotechnical stabilization of the banks of the flooded Hulín sandstones on the specified section. Shore abrasion is mainly caused by the starting wind, which results in the formation of waves that subsequently spread the banks. The result of the thesis is the processing of biotechnical stabilization proposals, which are intended to reduce or slow down the retreat of the bank lines.
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Measurement of wear in shock absorber with magnetorheological fluid
Žáček, Jiří ; Strecker, Zbyněk (referee) ; Roupec, Jakub (advisor)
This bachelor thesis deals with measurement of abrasivity of magnetorheological fluids and its effect on hydraulic shock absorber. The abrasion could be measured and evaluated by many ways. The pin on block measurement method has been selected for this test. The pin was moving on a steel block while the whole system was surrounded by magnetorheological fluid. According to results, the lifetime of magnetorheological shock absorber is 4 times shorter than classical damper. Results of this thesis could be helpful in damper construction or in development of new magnetorheological fluids.
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Monitoring the influence of concrete composition on abrasion resistance
Černá, Hana ; Novosad, Petr (referee) ; Bodnárová, Lenka (advisor)
This diploma thesis focuses on the resistance of concrete to abrasion with regard to the raw materials used for their production. In the theoretical part of the thesis are described admixtures, different types of aggregate and aggregate composition which influence the resistance of concrete to abrasion. In the experimental part, 15 different C30 / 37, S4 concrete formulations were proposed. Different types of aggregates - fecal gravel (Žabčice), biotic granodiorite (Olbramovice) and amphibolite (Želešice) have always been used in the recipes. Fine ground limestone, micro-silica, high-temperature fly ash and finely ground slag were ingredients that were added to the proposed recipes. Consistency was determined by the method of cone seating and the density of fresh concrete. In the hardened state, concrete density, compressive strength, bending tensile strength, tensile strength, watertightness, concrete absorption, and abrasion resistance were determined using the Böhm method and wide wheel method. The test specimens were tested after 7, 28, and 90 days of maturation.
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Proposal to revitalize the banks of the flooded Hulín sand pit
Skřížala, Lukáš ; Pelikán,, Petr (referee) ; Šlezingr, Miloslav (advisor)
The master´s thesis deals with the assessment of the state of the shore territory on the Brno reservoir, in the Osada area and subsequently the proposal for shore stabilization. As part of a personal visit to the area of interest, photographic documentation, geodetic focus and subsequent assessment of the current state of the abraded shores were made. Using the geodetic focus and data of water heights on the reservoir provided by the Povodí Moravy, s.p. the most numerous in the reservoir was evaluated in 2007-2017, the coastline retreat and the proposed shore stabilization were determined. There was suggested totaly eight measures were proposed against the further retreat of the shore line, which were incorporated into schemes and visualizations.
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