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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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Verification of application of factor analysis of water resources quality by maps
Ďurďová, Libuše
Chemistry development was assessed in locations where sulphate concentration increase exceeded 250 mg/l. For verification of layout physical and chemical water quality where composed maps in Arcview environment by method inverse distance weighted. Digital topological data vector maps ZABAGED in scale 1:10 000 were used. Evaluation of ground water chemistry development by application of factor analysis of physical and chemical water qualities was conducted.
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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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Flood situations influence on water quality in reservoirs controlled by means of mathematical modelling
Kafková, Dagmar ; Balejová, Marcela
Příspěvek se zabývá možnostmi matematického modelování pro sledování vývoje kvality vody v nádržích za běžných provozních podmínek i během extrémních povodňových situací se zvláštním zreželem na nádrž Pastviny na Divoké Orlici. Pro tuto nádrž byl upraven dvourozměrný matematický model CE-QUAL-W2, který se již dříve osvědčil při modelování nádrže Římov na Malši. Validaci modelu pro nádrž Pastviny nelze v současné době považovat za dokončenou, protože z předchozích let není k dispozici dostatečné množství bilogických a chemických dat, avšak bathymetrická data již odpovídají současnému stavu po vypuštění a vyčištění nádrže a model je připraven pro použití, jakmile budou potřebná data shromážděna.
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Model analysis of effects of hydrodynamics and nutrient loading to water-quality in a dimictic reservoir (Jordán)
Jarošík, Jiří ; Hejzlar, Josef ; Borovec, Jakub ; Růžička, Martin
The dynamic, two-dimensional model CE-QUAL-W2 was used to simulate recovery conditions in the eutrophic Jordan Reservoir. The aims were: (i) to calibrate the model and discuss differences between simulated and measured data; (ii) to use the calibrated model to determine the effects of external and internal phosphorus load and the depth of outlet on trophic conditions. After calibration the model reproduced thermal stratification, oxygen regime and concentrations of NO3-N with sufficient precision. Simulation of PO4-P was less exact. The results of mathematical simulation showed that (i) the required mesotrophic level cannot be accomplished without a significant decrease in inflow concentration of total phosphorus; (ii) the internal load of phosphorus is small and become insignificant after decrease of external load; and (iii) the use of bottom outlet is a potentially efficient method to partly decrease trophic level of Jordan Reservoir.
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