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Precipitation amount differences between fixed and sliding time windows
Razím, Matyáš ; Müller, Miloslav (advisor) ; Pokorná, Lucie (referee)
Title of Thesis: Precipitation amount differences between fixed and sliding time windows Author: Matyáš Razím Supervisor: RNDr. Miloslav Müller, Ph.D. Abstract This thesis introduces the issue of differences between precipitation totals measured within fixed and sliding periods (further as fixed and sliding totals). Because of several reasons, the precipitation is being measured in given intervals, in practice. Values obtained in this manner, however, are mostly lower than if the measuring period of the same length is set to include as much precipitation as possible. This is because the sliding total is split in two fixed totals. Therefore, values of certain precipitation characteristics, essential for the evaluation of potential hazards and their impact on the society, are often underestimated. So, the thesis presents a research of the precipitation measurement methods, as well as the previous explorations of the given matter and the influences determining the average magnitude of the fixed vs. sliding totals difference. This difference is expressed via the so called Hershfield factor, a coefficient used for conversion of sets of fixed totals to sliding totals. Its general value is most commonly determined as 1.13. It, however, varies according to the precipitation length, climate and several other...
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Radar Meteorology Principles and Possibilities
Fišer, Ondřej ; Kráčmar, J.
The contribution describes the principles of meteorological radars and the wavelength choice. The description of meteorological targets is also shown as well as typical technical parameters of meteorological radars. The radar equation for meteorological targets is shown on the base of the difference from the air traffic radars. The basic terms such as equivalent radar reflectivity factor are defined. The estimation technique of the precipitation intensity is deduced. The possible uncertainty is discussed . Also dual wavelength and polarimetric radars and its improved possibilities are added.
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