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Influence of winter snow conditions on minimum discharges in the warm season in mountain catchments in the Czech Republic
Součková, Markéta ; Jeníček, Michal (advisor) ; Šípek, Václav (referee)
As a result of climate change, the snowfall amounts may be reduced and hence the snow accumulation, which recharges the groundwater in spring. Groundwater significantly influences summer low flows and its deficiency may negatively affect the streamflow and reduce the water supply in snow- dominated regions. This thesis aimes to describe the influence of changes in snow water equivalent on the inter-annual variability of minimal discharges in warm season (April to September) in eleven mountain catchments of the Czech Republic. The aimes were to determine 1) the duration of snow effects on the minimum discharges after the snowmelt onset, 2) the effect of inter-annual changes of snow water equivalent on minimal discharges in the warm season and 3) the date of the summer lowflows and the trend of its shift within the year. The results are based on hydrological and climatological station data collected by Czech Hydrometeorological Institute between the years 1980 and 2014. Snow affected the summer low flows until June and in exceptional cases even until July in higher elevation catchments. The most significant change was recorded in Úpa catchment, which belongs to higher elevation catchments, the 10 % decrease of maximum snow water equivalent caused reductions in minimal discharge by 8.8 % and 6.8 % in...
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Climatic change effect on hydrological drought in the Otava River headwaters
Šachová, Barbora ; Kocum, Jan (advisor) ; Fiala, Theodor (referee)
CLIMATIC CHANGE EFFECT ON HYDROLOGICAL DROUGHT IN THE OTAVA RIVER HEADWATERS Abstract The submitted thesis deals with hydrological drought in condition of climate change in Otava River headwaters. The topic is discussed from four different aspects that together create a complex view on the hydrological drought issues in the catchment. The first aspect, the hydrological drought analysis in daily series, is done by threshold level method and SPA. Second aspect studies the impact of climate change on the hydrological drought by using the BILAN model. Following aspect determines a prediction of low flows and deficit volumes during drought by the recession analysis. Final aspect suggests relating process of management, planning and adaptation measures on drought. Key words: hydrological drought, minimal discharges, deficit volumes, BILAN model, climatic change, recession analysis, Otava River, Modrava, Rejštejn, Sušice, adaptation measures
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