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Sediment analysis and hydrological regime of water reservoir Všechlapy
Wolfová, Helena ; Šobr, Miroslav (advisor) ; Kliment, Zdeněk (referee)
This masters thesis is focused on the evaluation of anthropogenic sediment pollution and the total estimate of the siltation of the Všechlapy reservoir. Based on bathymetric mapping, the morphometric parameters of the Všechlapy reservoir were evaluated. By digitizing the old map of the previous terrain before the construction of the dam, its current siltation of 15.7 % with bedload sediment was determined. Bedload sediments and river sediments of two streams were collected, in which the grain size analysis of the fine-grained fraction and the chemical analysis by pseudo-total digestion were performed to determine the content of metals and metalloids. Evaluation of sediment pollution was performed using geoaccumulation index using global and local background values of the natural environment. It was found that the Bouřlivec stream was rated the worst pollution classes in terms of cadmium, arsenic, copper, lead, zinc and nickel. Based on their chemical properties, these increased concentrations were also reflected in the samples taken from the bed of the Všechlapy reservoir. Part of this thesis was also the review of the hydrological regime of the Všechlapy reservoir. key words: sediment pollution, water reservoir Všechlapy, Bouřlivec stream basin, bathymetric survey, aqua regia leaching
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Identification and characterisation of abolished water reservoirs areas using GIS
Wolfová, Helena ; Matoušková, Milada (advisor) ; Šobr, Miroslav (referee)
This bachelor thesis aims to identify areas of small abolished water reservoirs using old maps and digital terrain model of the 5th generation. The main methodologies include georeferencing of old maps, followed by creation of an utmost detailed digital terrain model and field reconnaissance on the selected sites of abolished small water reservoirs. Changes in the land cover of selected abolished reservoirs as well as the change of the total water area in the study area were analysed. The thesis uses data obtained from Povodí Ohře s.p., the 5th generation digital model of relief, the old maps of the II, and III. military survey and maps in the S-52 coordinate system. The basin of Skřiváň brook, belonging to the basin of Svatava river, was selected as the study area. It was discovered that more than a half of the reservoirs disappeared during the 20th century. The most significant decrease was noticed during the 19th century. Area of small water reservoirs decreased to 40.51% of the original area from the period of the II. military survey. Key words: old maps, abolished water reservoirs, digital terrain model of the Czech Republic of the 5th generation, Svatava basin
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