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Nutrient balance of the Rožmberk pond and its influence on the water quality of the Lužnice river
MONDEKOVÁ, Aneta
This diploma thesis deals with the nutrient balance of the Rožmberk pond for the years 2020-2021 and its impact on the river Lužnice. Due to the strongly eutrophic state of the pond caused by several polluting influences, such as insufficiently treated wastewater from the Třeboň WWTP or the outlet of wastewater from the R.A.B large pig farm, the Rožmberk pond was evaluated as the main source of phosphorus for the Orlík. The river Lužnice, flowing through Rožmberk, transports nutrient-rich water further to Orlík. Furthermore, this work is devoted to the study of sediments and phosphorus contained in it, as an internal source of phosphorus in the pond. The aim of this diploma thesis is to evaluate the nutrient balance for the mentioned years and compare with previous years of balance monitoring to the current situation in Rožmberk. The last calculation of the substance balance was in 2014, and therefore it is important to find out what the current situation on the pond is. Data for the purposes of this work were obtained by regular, balance monitoring of the state enterprise Vltava River Basin within 14-day intervals. Based on the results obtained by this work, when the pond showed negative retention, i.e., more phosphorus flowed out than it reached the pond with tributaries, it can be stated that the Rožmberk pond is a significant player influencing water quality in the Lužnice river basin. Internal processes are applied in the pond, when the pond copes with the old ecological burden, due to the significant amount of phosphorus stored in the sediment. Rožmberk pond shows that material balances are indispensable for determining the actual conditions in ponds. We cannot do without this information about the proposed measures to improve the quality of water in ponds.
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