Hodnocení kvality vody ve vodní nádrži Baška po odtěžení sedimentu

Abstract

The aim of diploma thesis is to evaluate the quality of water and degree of ecological potential in the reservoir Baška after partial extraction of sediments. Excavation of sediments was carried out by the administrator of this reservoir the state enterprise Povodí Odry over the years 2012-2013. Retention area was increased by extraction of sediments and it was supposed that water quality will be improved. Diploma thesis relates to the results from bachelor thesis, which was based on evaluation of chemical indicators of water quality and its changes before and after extraction. The diploma thesis focuses mainly on biological indicators of phytoplankton community and balance of phosphorus, as main nutrient, which supports the development of phytoplankton in the reservoir. The first chapters deal with general effect of sediments on water reservoirs and their matter of extraction. Afterwards, the thesis focuses on issues of Water Framework Directive. The next chapters then describe and consider individual chemical and biological parameters, so it can be obtained information about water quality in the reservoirs. The practical part evaluates the ecological potential according to general physicochemical indicators and due to the multimeric index of the phytoplankton community. Other chapters describe the dynamic of phytoplankton and zooplankton during the years before and after extraction of sediments. The last chapter describes the phosphorus balance at the inflow and outflow from the reservoir and explores the issues of enrichment of the reservoir with phosphorus. In these chapters are also described sampling points, sampling methodology, methodology of processing of all parameters and overall evaluation of water quality in the reservoir four years after filling.