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Mountain lee waves in Czechia
Kloubová, Martina ; Müller, Miloslav (advisor) ; Kerum, Jacek (referee)
Mountain lee waves in Czechia Abstract This thesis has predominantly a search character. It summarizes the most important theoretical and practical findings about mountain lee waves, available in both Czech and foreign resources. It also discusses another phenomena and types of air flow related to the air layer's flow over a barrier. In a special chapter there is an introduction into the use of mountain lee waves for gliding. Another part of the thesis analyzes in detail Czech areas, where the lee waves can occur, and there are also mentioned the conditions of their occurence in those areas. Jeseníky mountains by southwest winds are the most sought after area, because it's possible to achieve a long distance and significant elevation difference when gliding there, in addition to ability of flying in levels normally restricted. The last part of the thesis discusses the possibilities of lee waves forecasting, with a demonstration on a specific model, linked by a data record of a flight. Currently, the main wave-forecasting instrument is the numerical model WRF, which predicted rising areas in the considerated case correctly, regardless the horizontal resolution 1 or 2 km. Keywords: lee waves, orographic clouds, lee, atmospheric turbulence, rotor, gliding.
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Effects of orography on spatial distribution of heavy precipitation in the north-east of the Czech Republic
Průchová, Kateřina ; Müller, Miloslav (advisor) ; Šercl, Petr (referee)
The dissertation deals with the influence of orography on the spatial distribution of heavy precipitation in the territory of the northeast Moravia and Silesia. The area was chosen because of the specific distribution of daily precipitation for heavy rainfall events in the past and also in May 2010. Cases of heavy rainfall for the period 1961 - 1995 are balanced with morphometric characteristics in the place and in the surrounding the station, defineted in face of direction air flow. For the calculation of the direction air flow are used data from 850 hPa level from reanalysis ERA-40, topographic characteristics are calculated by ArcGIS and they are correlated with the rain gauge data from stations ČHMÚ. The results show us that only the altitude does not have effect on the spatial distribution of precipitation, but it should be think over more topographic parameters. During the north and partially during the west air flow, where the precipitation are mostly from the stratiform clouds, appears a stronger orography influence on the measurement and on the spatial distribution, if we consider the morphometric characteristics behind the station in the direction of air flow. The case of south and east air flow showed us a weaker orography effect, which can be perhaps explained by a higher part of...
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Mountain lee waves in Czechia
Kloubová, Martina ; Müller, Miloslav (advisor) ; Kerum, Jacek (referee)
Mountain lee waves in Czechia Abstract This thesis has predominantly a search character. It summarizes the most important theoretical and practical findings about mountain lee waves, available in both Czech and foreign resources. It also discusses another phenomena and types of air flow related to the air layer's flow over a barrier. In a special chapter there is an introduction into the use of mountain lee waves for gliding. Another part of the thesis analyzes in detail Czech areas, where the lee waves can occur, and there are also mentioned the conditions of their occurence in those areas. Jeseníky mountains by southwest winds are the most sought after area, because it's possible to achieve a long distance and significant elevation difference when gliding there, in addition to ability of flying in levels normally restricted. The last part of the thesis discusses the possibilities of lee waves forecasting, with a demonstration on a specific model, linked by a data record of a flight. Currently, the main wave-forecasting instrument is the numerical model WRF, which predicted rising areas in the considerated case correctly, regardless the horizontal resolution 1 or 2 km. Keywords: lee waves, orographic clouds, lee, atmospheric turbulence, rotor, gliding.
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Effects of orography on spatial distribution of heavy precipitation in the north-east of the Czech Republic
Průchová, Kateřina ; Müller, Miloslav (advisor) ; Šercl, Petr (referee)
The dissertation deals with the influence of orography on the spatial distribution of heavy precipitation in the territory of the northeast Moravia and Silesia. The area was chosen because of the specific distribution of daily precipitation for heavy rainfall events in the past and also in May 2010. Cases of heavy rainfall for the period 1961 - 1995 are balanced with morphometric characteristics in the place and in the surrounding the station, defineted in face of direction air flow. For the calculation of the direction air flow are used data from 850 hPa level from reanalysis ERA-40, topographic characteristics are calculated by ArcGIS and they are correlated with the rain gauge data from stations ČHMÚ. The results show us that only the altitude does not have effect on the spatial distribution of precipitation, but it should be think over more topographic parameters. During the north and partially during the west air flow, where the precipitation are mostly from the stratiform clouds, appears a stronger orography influence on the measurement and on the spatial distribution, if we consider the morphometric characteristics behind the station in the direction of air flow. The case of south and east air flow showed us a weaker orography effect, which can be perhaps explained by a higher part of...
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