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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Impact of hydrology on phosphorus transport in the catchment of drinking water reservoir Římov
 Turek, Jan ; Hejzlar, Josef ; Žaloudík, Jiří
This paper deals with phosphorus transport processes from catchment of Římov drinking water reservoir in water courses. Export of dissolved and particulate phosphorus forms from the catchment is compared with P amounts discharged from municipal wastewater sources and transported from diffuse sources. Plausible extent of P retention is evaluated on the basis of detailed monitoring of Malše at Pořešín in relation to variable flow conditions and seasonality.
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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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