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Influence of snow cover on catchment outflow in wooded and unwooded environment
Hintnaus, Ivo ; Kliment, Zdeněk (advisor) ; Jeníček, Michal (referee)
This work deals with the evaluation of snow cover and snow spatial distribution in experimental Zbytinský and Tetřivči stream basin. Snow mesaurements were focused on snow depth and a snow water equivalent. Interpolation metods and detailed monitoring of rainfall-flow process were applied in the period of the winter half-year 2009 - 2011. The effects of geografic factors on spatial distribution of snow cover in the accumulation period and in the snow melting period were analysed. The analysis of physical geografic factors effect was focused on vegetation, exposure, slope, wind flow and shading. Results confirmed the strong effect of vegetation in the accumulation and snow melting period. Other physical geografic effects on spatial distribution of snow cover were not so significant. The model HEC-HMS was applied to determine the runoff in both stream basins. Simulations result in the winter half-year period reached good agreement between observed and simulated hydrographs. Effects of snow cover contribution to runoff in the snow melting period in wooded Tetřívčí stream basin and also in antropogenic Zbytinský stream basin were proved based on simulations of outflow and snow water equivalent. Key words: snow depth, snow water equivalent, HEC-HMS, Blanice River basin, Zbytinský stream, Tetřívčí stream
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Changes in snowpack in the czech mountains during the last 50 years
Zuzáková, Eliška ; Pokorná, Lucie (advisor) ; Zíková, Naděžda (referee)
This work focuses on the progressive development of snow cover in the last fifty years in Krkonoše, Jizerské mountains and Šumava regions. According to scientific papers and studies, a decrease of snow or snow precipitation is observed on some areas. Snow is an essential part of the natural hydrological cycle and the climate system. The review is focused on the climate changes in the Czech republic, snow and its characteristics. The practical part containes an analysis of the meteorological data from selected stations and the discussion of the snow cover changes during the period 1964-2014. Key words: Czech republic, number of days with snow cover, snow depth
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Factors affecting UV index in the Czech Republic
Tomanová, Helena ; Pokorná, Lucie (advisor) ; Čížková, Klára (referee)
Factors affecting UV index in the Czech Republic Abstract Recently, the shortwave radiation signified as UV radiation became a popular topic, connected mainly to the loss of ozone in the stratosphere. This radiation has both positive and negative effects on humans. Therefore, the UV index was introduced, which express the biological effect of UV radiation on human health. The thesis describes the geographical parameters and meteorological conditions affecting the values of UV index. The UV radiation its measurement methods, and its effects on human health and other living organisms is described in detail in the theoretical section. It also contains the definition of UV index and the factors affecting the UV index magnitude: latitude, the height of the sun above the horizon, altitude, cloud cover and the character of the active surface. Links between UV index and individual parameters are checked in the practical section using the UV index measurement from four stations in the Czech Republic during the period 2011 - 2017. The research shows, that the UV index is significantly lower for an overcast sky in comparison with clear sky. The present of snow cover increases the effects of UV radiation, particularly for the high elevations of the sun above the horizon. Key words: Czech Republic, global radiation,...
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Effect of key factors on dynamics of a snow cover evolution in Šumava Mts. conditions
Fliegl, Ondřej ; Kocum, Jan (advisor) ; Jelínek, Jan (referee)
Master thesis is concerned with the subject of a snow cover dynamics (focused on snow melting) and of the detailed analysis of each physical-geographic factors effect on its character. Knowledges published in the domestic and foreign scientific literature are confronted with the data acquired within a number of expeditionary snow monitoring campaignes carried out during winter periods 2011/2012 a 2012/2013 in headwaters of rivers of Šumava (Šumava Mts., southwestern Czechia). Mobile field survey was done in a number of time horizons within the broadly conceived research in the upper Otava River basin concentrated on the assessment of the retention potential in headstream areas.
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Influence of snow cover on catchment outflow in wooded and unwooded environment
Hintnaus, Ivo ; Kliment, Zdeněk (advisor) ; Jeníček, Michal (referee)
This work deals with the evaluation of snow cover and snow spatial distribution in experimental Zbytinský and Tetřivči stream basin. Snow mesaurements were focused on snow depth and a snow water equivalent. Interpolation metods and detailed monitoring of rainfall-flow process were applied in the period of the winter half-year 2009 - 2011. The effects of geografic factors on spatial distribution of snow cover in the accumulation period and in the snow melting period were analysed. The analysis of physical geografic factors effect was focused on vegetation, exposure, slope, wind flow and shading. Results confirmed the strong effect of vegetation in the accumulation and snow melting period. Other physical geografic effects on spatial distribution of snow cover were not so significant. The model HEC-HMS was applied to determine the runoff in both stream basins. Simulations result in the winter half-year period reached good agreement between observed and simulated hydrographs. Effects of snow cover contribution to runoff in the snow melting period in wooded Tetřívčí stream basin and also in antropogenic Zbytinský stream basin were proved based on simulations of outflow and snow water equivalent. Key words: snow depth, snow water equivalent, HEC-HMS, Blanice River basin, Zbytinský stream, Tetřívčí stream
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