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Selected issues in hydrology and hydrogeology of the Trebon Basin
Nymsa, Zdeněk ; Slavík, Martin (advisor) ; Nedvěd, Jakub (referee)
In the last few decades, the average temperatures in the Czech Republic have been increasing, which has led to increase in evapotranspiration. Previous studies have shown that increases in evapotranspiration during the summer months can lead to significant reductions in flows and even to drying up of small watercourses. Additionally, snow cover has also been on the decline in recent years, resulting in no flow enhancement in spring months and therefore lower soil moisture problems ensue. Due to the possible decrease in precipitation and/or increase in evapotranspiration, there is also the risk of less groundwater recharge in the future. The aim of my thesis is to verify the correlation between several selected parameters in the Trebon Basin, namely the relationship between evapotranspiration, precipitation and baseflow and groundwater levels in boreholes. A sub-objective is to verify the long- term evolution of these parameters in the Trebon Basin. Atmospheric precipitation and its variability during the year have not changed since the 1960s, while the magnitude of potential evapotranspiration has statistically significantly increased over this time and its variability during the year has decreased. The difference between atmospheric precipitation and potential evapotranspiration has been...
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Perspectives of flue-gas desulphurisation gypsum and rock gypsum in the Czech Republic
Nymsa, Zdeněk ; Přikryl, Richard (advisor) ; Ettler, Vojtěch (referee)
Flue gas desulphurisation (FGD) gypsum makes one of the so-called coal combustion by-products. FGD gypsum is the mostly used type of synthetic gypsum. In many applications, it can fully substitute natural rock gypsum (e.g. in wallboard production or as setting retarder in cement industry). Production and usage of FGD gypsum is directly connected with electricity generation based on coal combustion. In a broad scale, FGD gypsum appeared in Japan, USA, and Western Europe in 1970s-1980s, a bit later (in 1990s) also in Central Europe. During recent decades, the technology quickly spreads in Asia (China, India, etc.) as well. Ironically, the countries which used FGD gypsum technology as the first, will be probably also the first one which will cease the technology due to demise from energy generation in coal power stations. With a certain delay, similar trend is expected in the Czech Republic as well. Based on this presumption, this BSc. thesis discusses various scenarios, including possibility of long-term deposition of FGD gypsum in order to allow its usage over longer period in the future. Besides this, the thesis also strengthens the importance of natural gypsum, which will replace FGD gypsum in the future.
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