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Realtime Weather in a Landscape Visualisation
Vlček, Adam ; Jošth, Radovan (referee) ; Seeman, Michal (advisor)
Thanks to the increasing computation power the complexity and dynamism of virtual reality is continuously improving. This work aims to examine influences of weather in a landscape and the means to simulate and dynamically visualize them in real time on the current personal computer hardware. The main goal is to find quick well looking approximations rather than a complex physically correct simulation. The work covers using modern programmable GPU not only for visualization but also as a powerful simulation instrument. The main topic is water movement in the terrain and its effects on it like erosion, snow melting and moisture impact on vegetation. This requires dynamic terrain texturing and algorithms supporting fast geometry and normals updates.
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Realistic Model of the Sky
Kussior, Zdeněk ; Bílek, Václav (referee) ; Drahanský, Martin (advisor)
The paper describes a theoretical base and realization of realistic volumetric clouds visualization in an environment of real-time simulator. The first part is concerned with a meteorological background of this problem. I show international classification of ten basic cloud types including a short description and cases of occurence. The following part is concerned with an interaction between cloudiness and simulation core, which is based on the fact, that each cloud acts as a mechanical or an electromagnetic obstacle. This should be considered on some way in simulation. The next part describes technologies and practical implementations of visualization and evaluates their characteristics. Finally, the last chapter describes my implementation and tries to outline project advancement.
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Atmospheric Phenomena
Radouš, Jakub ; Milet, Tomáš (referee) ; Kobrtek, Jozef (advisor)
This bachelor's thesis deals with a visualisation issue of several atmospheric phenomena by means of the OpenGL library. The work contains theoretical bases for rain, snowfall, lightning, fog, wind, tornado and rainbow, which are further converted to the form of algorithms. The outcome is an application with graphical user interface that is able to display seven natural phenomena set in a landscape.
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Measurement of the rain rate instantaneous value using acoustic method
Kresta, Daniel ; Poliak, Juraj (referee) ; Wilfert, Otakar (advisor)
This thesis deals with implementation of the rainfall rate measurement using an acoustic method. It is divided into four parts. In the first part of the thesis a necessary theoretical knowledge is analysed. The second part contains a design of a workplace used for the measurement. The third part presents and analyses important experimental recordings acquired in the workplace. Then all measured values are processed and applied in the measuring program. The last part summarizes results of the thesis, advantages and disadvantages of using the acoustic rainfall rate meter.
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Extreme hydrological events in the context of urban planning
Klimeš, Zdeněk ; Dráb, Aleš (referee) ; Duchan, David (advisor)
The purpose of the bachelor thesis was to describe known extreme hydrological events and potential attitudes to minimalize their negative impacts. The thesis was written as literature recherche from different points of view, not only from a one-sided technical or ecological point. It proceeds systematically from describing the historical evolution of the subject matter through the presentation of global ecological problems, outlining the legislative background and the findings from specialised literature, to the examples of current trends. In view of the fact that the issue is so broad, the thesis treats only certain parts in detail. The subject of interest is the demonstration of separate measures against floods and droughts and the effects of their synergy concerning the minimalization of the repercussions of extreme hydrological events.
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Automated area measurement of precipitation intensity via a network of microwave links
Bubniak, Milan ; Pospíšil, Ondřej (referee) ; Musil, Petr (advisor)
Point-to-point microwave links can be utilized as a large sensor network to measure rainfall. This work deals with the application of this procedure in practice. The first part of the thesis deals with atmospheric precipitation in general and standard methods of their measurement; and the propagation of the microwave signal and various causes of its attenuation, focusing on the attenuation caused by rain and the recommendation ITU-R P.838. This is followed by a state of the art summarization of the measurement of rainfall by microwave links. In the second part of the work, a manual procedure for calculating rainfall from microwave link data is performed, taking wet antenna attenuation into account. Then the creation of a support tool in the C# language is being described, which supply the data to the functions of the RAINLINK rainfall calculation library. Several rainfall calculations that are validated by physical rain gauges are performed. Furthermore, the own Telcorain application for rainfall calculation is created in the Python language, based on the pycomlink library. It has a graphical user interface created in PyQt. Several rainfall calculations validated by rain gauges are performed again, and the results are compared with the RAINLINK library.
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Rain Prediction Using Meteo-Radar
Gerych, Petr ; Hradiš, Michal (referee) ; Szőke, Igor (advisor)
This paper deal with the rain prediction in the short time interval. The static pictures from meteo-radar serves as input data. The principle of meteo-radar is explained. The possible methods of the object detection and registration, motion interpolation and extrapolation is described. The flood fill algorithm and Lagrange extrapolation is applied to rain prediction. Application is written in C++ language under OS Linux. The example of the software application results is included.
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Atmospheric Efects in WebGL
Brydl, Jaroslav ; Lysek, Tomáš (referee) ; Starka, Tomáš (advisor)
This thesis deals with the simulation and rendering of atmospheric effects in WebGL using Three.js application interface. The principles of functioning and implementation of the effects of altering day and night, clouds, snow, rain and shadows are described. Effects are mostly implemented with GLSL shaders that allow easy use across different platforms.
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Effect of operating conditions on tram noise in real traffic
Lounek, Kryštof ; Galas, Radovan (referee) ; Valena, Martin (advisor)
The bachelor's thesis investigates the influence of weather conditions on the squeal noise produced by the contact of the wheel with the top of the rail. Weather conditions are defined here as humidity, air temperature and the presence of rain. The thesis also compares specific trams in terms of their propensity to produce squeal noise and the parameters of the noise produced. The data sets used in the analysis come from a one-month period from a stationary module located near the track curve in the Brno-Komín tram loop. The graphical dependencies, which are the result of the work, describe a decreasing tendency of the average noise level depending on the humidity and an increasing tendency of the average noise level depending on the temperature. They also show a significant reduction in the occurrence of squeal noise during rain. As far as the tram comparisons are concerned, tram no. 1713 produces the most squeal noise, in fact in 86% of the cases. It also has one of the highest values of all noise parameters. The results of this work can help to explain the variable behaviour of squeal noise and can also be used to identify specific noisy trams.
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Research on Methods for Quantifying Attenuation due to the Wet Antenna Effect
Skoumal, Vladimír ; Dvořák, Radim (referee) ; Bubniak, Milan (advisor)
The topic is the calculation of precipitation using commercial microwave links. Since current techniques in meteorology are not perfect, this way of measurement can be a suitable complement to meteorological instruments. One of the current problems is wet antenna attenuation. This is an excess attenuation that affects the final precipitation calculation. In the first part of the thesis, microwave connections are generally described, how they look, how they are put into operation and their important parameters. Furthermore, this section contains a theoretical analysis of precipitation, various types of measurement of this quantity, and a description of the possibilities of measuring precipitation using microwave links. An important theoretical part is the description of the methods for calculating the WAA or wet antenna attenuation, where the Schleiss, Leijnse and Pastorek methods are described. Furthermore, freely usable libraries are described in the work, which contain functions for calculations of precipitation using microwave links. The last theoretical part describes the Telcorain application, which is used to calculate precipitation at this work. The second part of this work contains the changes made in the code of the Telcorain application. It also contains a comparison of WAA methods for calculating precipitation as well as variously selected sets of microwave links for different rain events and development development of own method for WAA calculation.
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