National Repository of Grey Literature 120 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Study of the limnological components of the ecosytem of Lake Medard in 2022.
Peterka, Jiří ; Hejzlar, Josef ; Nedoma, Jiří ; Znachor, Petr ; Seďa, Jaromír ; Vejřík, Lukáš
The report summarizes the research results of the limnological components of the ecosystem of the newly created Medard postmining lake achieved for the year 2022 and recommendations for further monitoring.
Hydrobiological monitoring of Lake Medard in 2021.
Peterka, Jiří ; Hejzlar, Josef ; Nedoma, Jiří ; Znachor, Petr ; Seďa, Jaromír
The report summarizes the research results of the limnological components of the ecosystem of the newly created Medard postmining lake achieved for the year 2021 and recommendations for further monitoring.
The use of multiple-criteria decision-making analysis when choosing a variant of the Skalička dam.
Brouček, M. ; Hejzlar, Josef ; Říha, J. ; Satrapa, L.
The synthesis of the results of the multi-criteria evaluation indicates a lateral multi-purpose reservoir as the most suitable option for flood protection on the Bečva River in the Skalička profile.
Optimization of the outflow regime in the Římov reservoir from the point of view of water supply.
Hejzlar, Josef ; Jarošík, Jiří ; Mercado, Ma. Cristina Paule ; Porcal, Petr
A model analysis of the influence of the discharge regime and climate change on the Římov reservoir, Czech Republic, showed the optimal way of managing the reservoir from the point of view of water quality.
Improving the ecological potential and water quality in reservoirs using floating vegetation islands.
Čtvrtlíková, Martina ; Krolová, Monika ; Kučerová, Andrea ; Hejzlar, Josef ; Hladík, M. ; Kubečka, Jan
The aim of the two-year experiment was to verify the ability of four species of sedges and natural pioneering plants to grow on substrate-free floating islands.
Hydrobiological monitoring of Lake Medard in 2020.
Peterka, Jiří ; Hejzlar, Josef ; Nedoma, Jiří ; Znachor, Petr ; Seďa, Jaromír
The aim of this report is to summarize the results achieved in 2020 and make recommendations for further monitoring. The year 2020 was the third year after the full filling of the lake. The lake ecosystem has reached a final state in terms of hydrological regime and nutrient load, which is characterized by very low water turnover, low trophic state with low productivity of planktonic communities, development of submerged macrovegetation in littoral areas and specific seasonal changes in chemistry and biological parameters. However, the aquatic ecosystem is far from being stabilized and the biological communities of the littoral and the open water areas, including the fish community, are still changing considerably from year to year.
Hydrobiological monitoring of Medard lake in 2019
Hejzlar, Josef ; Nedoma, Jiří ; Znachor, Petr ; Seďa, Jaromír ; Peterka, Jiří
Presented report summarizes the results of hydrobiological monitoring of Medard Lake in 2019 and recommends further monitoring actions. The year 2019 was the second year after the lake was filled, when no more water from the Ohře River was filled and only small tributaries from the small river basin flowed into the lake. Thus, the ecosystem of the lake has reached a final state in terms of hydrological regime and nutrient load, characterized by very low water exchange, low trophic levels with low productivity of planktonic communities, development of submerged macrovegetation in coastal zones and specific seasonal changes in chemistry and biological parameters.
Prediction of phosphorus concentration and trophic conditions in reservoirs
Hejzlar, Josef ; Kopáček, Jiří ; Vystavna, Yuliya
The model prediction of phosphorus (P) concentration in reservoirs is important for controlling water quality and trophic conditions, e.g. to determine to what level external P load should be reduced in order to decrease trophic conditions and achieve good ecological potential. The mass balance of P for 26 reservoirs and lakes in the Czech Republic showed that the relationship between the inflow P concentration and the in-reservoir P concentration is not determined solely by hydrological parameters (water residence time or hydraulic load) or inflow P concentration but is fundamentally influenced by the internal P loading from sediments and in-reservoir P cycling. These are individual characteristics of each reservoir and may change, for example with sediment accumulation or changes in external P load. Therefore, the prediction models need to be assembled and calibrated for each reservoir individually and the model structure should be adapted to their specific conditions.

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1 Hejzlar, J.
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