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Modelling the hydrodynamics and water quality of the Vltava river reservoir cascade
Růžička, Martin ; Hejzlar, Josef ; Jarošík, Jiří
Mathematical modelling is an efficient tool for evaluation of impacts of human activities and environmental changes on water quality in rivers and reservoirs. This contribution describes simulations of water quality in the Vltava River reservoir system, namely cascade of reservoirs Hněvkovice, Orlík, Kamýk, Slapy, Štěchovice, and Vrané. The two-dimensional water quality model CE-QUAL-W2 was used for this task over years 2000 to 2003. Sensitivity analysis, calibration, and evaluation of the model were done. The model gave good results in particular for hydrodynamics, water temperature, and conservative constituents because of good quality of available hydrological and meteorological input data. The accuracy of results was strongly depended on the quality of input data and sampling frequency. Minor problems occurred in water quality simulations based on monthly input data in periods with fluctuating discharges.
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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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