National Repository of Grey Literature 62 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
VN Sedlice – Experimental bottom sediment removal
Vrzák, J. ; Borecký, K. ; Borovec, Jakub
The report describes the progress of the mining experiment leading to the removal and deposit of bottom sediments from the reservoir. The report includes monitoring of technological conditions and the influence of mining and processing of sediments on the water quality in the reservoir.
Combining the results of particle and pore water analyzes - setting decision criteria for sediment management
Borovec, Jakub ; Jan, Jiří ; Hubáček, Tomáš ; Tomková, Iva
The study focuses on the prediction of sediments behavior in specific locations within the reservoir, and determination of risks they pose in terms of phosphorus (P) release into the water column. The introduced combination of two methods is used for these purposes: i) the vertical profiling of dissolved ions in the pore water and ii) the specific composition of particles in the corresponding sediment layers.
Use of a research sonar to determine sediment thickness
Borovec, Jakub ; Vrzák, J. ; Knotek, J.
The study summarizes research results aimed at the identification and quantification of sediments in freshwater reservoirs. An algorithm for the interpretation of sonar data, and the calculation of sediment thickness as well as for the estimation of basic sediment characteristics was developed. A device for the collection of sediment cores, which are used for the calibration of sonar output data was introduced.
Methodology for identification and quantification of sediments in water reservoirs
Borovec, Jakub ; Jan, Jiří ; Vrzák, J. ; Knotek, J.
Our contribution briefly introduces the Methodology for the assessment of sediments, which was certified by the Ministry of agriculture of the Czech Republic under the registration number 13084-2017-MZE-15000. The Methodology finds its use especially among the managers and owners of various water works, reservoirs, and ponds, but also project architects and implementation companies who come across and need to resolve many sediment-related problems. The Methodology also serves as a basic introduction into the problematics of reservoir sediments, but primarily offers the correct and most effective procedures, which should ensure significant savings and eliminate potential risks.
Sedlice Reservoir – coagulation experiments of sediment samples
Borovec, Jakub ; Jan, Jiří ; Tomková, Iva
The study was conducted on the basis of a contract between the Vltava River, State Enterprise and the Biology Centre CAS. The subject of the study comprised of sediment sampling from Sedlice Reservoir (Czech Republic) and coagulation experiments on these samples in order to find optimum conditions for dredged sediment dewatering using geotextile tubes and flow centrifuges. Results will serve to find optimum coagulation conditions to ensure maximum purification of the effluent from nutrients or contaminants during the process of sediment dewatering.
Use of a research sonar to determine sediment thickness
Borovec, Jakub ; Torrijos, Javiera ; Jan, Jiří ; Dadejík, M. ; Borecký, K. ; Vrzák, J.
The study summarizes research results aimed at the identification and quantification of sediments in freshwater reservoirs. An algorithm for the interpretation of sonar data, and the calculation of sediment thickness as well as for the estimation of basic sediment characteristics was developed. A device for the collection of sediment cores, which are used for the calibration of sonar output data was introduced.
Effect of terminal electron acceptors on biogeochemical processess and phosphorus cycle in sediment
Jan, Jiří ; Borovec, Jakub ; Petráš, D. ; Osafo, Nana O. A. ; Tomková, Iva ; Hubáček, Tomáš
This study focuses on the phosphorus (P) release from sediment of inflow part of Vranov reservoir under different availability of terminal electron acceptors, mainly dissolved O2 and NO3-. To understand the cycling of P in sediments, sediment cores were incubated for five weeks in three parallel variations that simulated: i) anoxia with depleted NO3-, ii) O2 saturated water column and iii) O2 saturated water column in the presence of high concentrations of NO3-. Evaluating the release of P and the impact of Iron (Fe) and its metabolism in sediment under the different conditions, water above the sediments was monitored, porewater composition and different P fractions in the sediment were analyzed.
Methodology for identification and quantification of sediments in water reservoirs
Borovec, Jakub ; Jan, Jiří ; Vrzák, J. ; Knotek, J.
The study was designed to find methodical procedures for effective and accurate detection and quantification of bottom sediments in water reservoirs, including an assessment of their impact on the quality of water in the reservoirs. The study summarizes the overall problem of sediments in the water bodies. Advantages and disadvantages of methods and equipment widely used for sediment sampling procedures for their quantification are assessed. The result is a developed optimal methodical procedure for proper spatial localization of sediments and determination of their volumes in given zones. The methodology also includes a precise procedure for the evaluation of its chemical parameters and the P cycle with further determination of the sediment potential to deteriorate water quality in the reservoirs.
Hydrobiological monitoring of Medard Lake in 2016
Hejzlar, Josef ; Borovec, Jakub ; Nedoma, Jiří ; Znachor, Petr ; Seďa, Jaromír ; Peterka, Jiří
Presented report summarizes the results of hydrobiological monitoring of Medard Lake in 2016 and recommends further monitoring actions. Between November 2015 and June 2016 final flooding from river Ohře took place, resulting in enrichment of the lake ecosystem by large amount of nutrients at the beginning of vegetation season what affected seasonal development of chemical as well as biological parameters, from phytoplankton to fish.
Hydrobiological monitoring of Medard Lake in 2015.
Hejzlar, Josef ; Borovec, Jakub ; Nedoma, Jiří ; Znachor, Petr ; Seďa, Jaromír ; Peterka, Jiří
Presented report is summarizing the results of the hydrobiological monitoring of Medard Lake in 2015 and recommends further monitoring actions. In 2015 the lake was not flooding from river Ohře, therefore the water level increase was realized only by precipitation and inflow from lake’s own drainage area. Furthermore, it was the first year without stocking of maraena whitefish and brown trout.

National Repository of Grey Literature : 62 records found   1 - 10nextend  jump to record:
Interested in being notified about new results for this query?
Subscribe to the RSS feed.