National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Changes of geochemistry of surface water in selected catchments of the Ore Mountains
Navrátilová, Denisa ; Matoušková, Milada (advisor) ; Benešová, Libuše (referee)
This master thesis focuses on an analysis of surface water chemistry, long-term trends and the impact of drought on changes in concentrations of selected parameters in the upper Svatava, Rolava and Načetínský potok basins located in the Ore Mountains. Research on water quality in mountain spring areas is important, the consequences of various changes can be easily observed there. This work analyses the changes in surface water chemistry and discusses their possible causes, especially the impact of peat bogs and dry episodes. The parameters of water temperature, conductivity, pH, BOD5, COD, TOC, concentration of nitrate nitrogen, total phosphorus, phosphates, sodium, potassium, calcium and iron were investigated for the period 1993-2018. The available data are analysed using evaluation methods according to ČSN 75 7221 as well as box plots, Pearson correlation coefficient, PCA analysis and Mann-Kendall test. The greatest anthropogenic influence exhibited in Svatava, almost all concentrations reached their highest values there. In the Rolava and Načetínský potok basins, the influence of peatlands manifested itself by increasing the concentrations of iron, TOC and COD. The results of trends showed an increase both in pH and in surface water temperature related to an increase in air temperature, on the...
Radiation exposure in coal miners
The bachelor thesis focuses on a problematics of radiation load of miners during coal mining. This topic is something that public and miners themselves are not aware of that well. The thesis sets following goals: To chart radiation load of miners during coal mining and the awareness of miners about risks of their job. For the theme were also set following research questions: How big is the rate of radiation exposure of miners during coal mining? Is there considered any radiation protection for miners? At what rate do the miners perceive threats associated with working at coal mine? Which risks the miners encountered during their work experience? How big is the awareness of miners about the threat of radiation load? The theoretical part of this bachelor thesis classifies and sets general characteristics of coal and its most significant coal deposits. Furthermore, the thesis describes natural radionuclides and its content in rocks, radiation load of miners and other risks connected to mining. The last section of theoretical part describes radiation protection, safety and protection of health at work. The practical part was processed based on literature study and qualitative research. For data collection was used semi-structured interview with miners which formerly worked at coal mines and with miners which are still actively working at mines. Furthermore, was conducted an interview with specialist which focuses on ionizing radiation sources in a form of industrial applications. After the analysis, the research questions can be answered as follows. According to studied literature can be concluded that radiation load of miners does exist. However, from conducted interviews emerged that minors do not know much about this problematic and most of them does not even consider radiation load as a threat. The radiation protection in Czech coal mines is regulated by legislation. Based on the valid legislative the average volume activity of radionuclides in the air must be measured in work environments with material containing increased content of natural radionuclides. However, the miners reported that they did not notice any radiation measurement in coal mines. From this statement can be considered that there are no exceeding levels set by legislation at coal mines where questioned miners worked. Other possibility might be that nobody deals with it which is indicated in the interview with radiation application specialist. Some miners realize threats connected to their work and some of them do not. Some miners reported gusts, shaking, presence of methane and coal dust, various injuries and more. Those who did not report specific threats responded that they do not consider these as threats after several years working at mines. Respondents reported a big amount of threats which they encountered at their work. Amongst others were mentioned gusts, accidents, shaking, stone falls, variable temperatures, risk of occupational disease, possibility of methane explosion, presence of noise and vibrations when working with machines.
Trends of hydroclimatic factors in selected catchments of the Ore Mts.
Navrátilová, Denisa ; Matoušková, Milada (advisor) ; Fraindová, Kateřina (referee)
The bachelor work deals with identification of the trends in data series of the chosen hydroclimatic factors (temperatures, rainfall and runoff) of the upper Svatava River basin and of the Načetín Brook which both drained the Ore Mountains. The main aim of the thesis is identification of the trends of both study catchments and their comparative analysis. The study uses mean daily discharges data from the gauging stations Klingenthal and Rothenthal and also from the German climatic stations situated near study catchments. The introductory part describes physical-geographic characteristics of study catchments. The main attention is paid to the analysis of temperatures, rainfall and runoff, e.g. by the method of linear regression, simple sum curves and by Mann-Kendall statistic test. More detailed analysis of the runoff was done using IHA software. Results of analysis show a significant annual trend of temperatures increasing and runoff decreasing during the examined period. The most significant changes in temperatures and runoff is recorded in the spring and summer seasons. Key words: outfall, rainfall, temperatures, the change of the rainfall-outfall régime, Mann- Kendall test, IHA analysis

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1 Navrátilová, Daniela
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