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Impacts of climate change on the water quality in a dimictic reservoir
Růžička, Martin ; Hejzlar, J. ; Cole, T. M.
The study deals with prospective change in water quality in a reservoir caused by predicted climit change. Change of quality of the water on its way through watershed and reservoir was simulated by an modeling system consisting of a precipitation-runoff model,an empirical model of the river water composition and a hydrodynamic and water quality model of the reservoir processes.Boundary conditions for model were based on the 20-year real data series(1981-2000) and predicted climate characteristics according to the results of the contemporary global circulation models(GCMs).
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Výzkum dopadů možné změny klimatu
Huth, Radan ; Dubrovský, Martin ; Žalud, Z. ; Šťastná, M. ; Trnka, M. ; Hejzlar, Josef ; Buchtele, Josef ; Růžička, Martin ; Kalvová, J. ; Nemešová, Ivana
Cilem tohoto příspěvku je stručná informace o projektech výzkumu dopadů změny klimatu, které v současné době probíhají v AV ČR a spolupracujících institucích a které koordinuje Ústav fyziky atmosféry AV ČR (ÚFA). Jedná se o dva multidisciplinární projekty, řešené v období 1999-2001. Jejich společnou částí je konstrukce scénářů klimatické změny pro experimentální lokality, řešená na ÚFA AV ČR a Katedře meteorologie a ochrany prostředí MFF UK.
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Eutrophication trends in the Vltava catchment area, Czech Republic
Hejzlar, Josef ; Vyhnálek, V. ; Kopáček, Jiří ; Procházková, Lidmila ; Komárková, Jaroslava
Long-term trends in phosphorus and phytoplankton concentrations were studied in Slapy Reserv.,as a representative of most reservoirs with medium flushing rate in the Czech Rep. Phosphorus and chlorophyll a concentrations increased from the 1950s to the middle 1990s as a consequence of an increase of phosphorus use and release into surface waters by human population. The decrease in phosphorus and chlorophyll a concentrations during the last decade can be interpreted as a beginning of a long-term recovery of Slapy Reservoir resulting from the decrease in P-loading into the surface waters by human population. Further possibility how to reduce phosphorus input to the surface waters is especially P removal from municipal waste waters. After higher reduction of phosphorus from waste waters, accomplishable especially by the entire elimination of P from detergents and by technologies of enhanced P removal in waste water treatment facilities,the trophic status of Slapy Reserv. lower than in the 1950s can be expected.
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