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Sediment management in reservoirs – methods of sediment handling, sediment reevaluation to product - stabilized solidificate
Vrzák, J. ; Borovec, Jakub ; Jan, Jiří
As part of the research work, a semi-operation was set up and a test polygon (''island'') was built on central Novomlýnská reservoir (Věstonická reservoir). The sediment excavation and its transformation into different type of ''products'' in a special mixing plant. The stabilised solidified product was subsequently used in the construction of the new island. The new island will be used this year for monitoring, including, among other things, the behaviour of the new sediment structural elements, its shape stability and other parameters. As part of the protection of the island from wave action, also from solidified sediment, experimental constructions of submerged breakwaters have also been created. Another way of using the stabilised solidified sediment is outside the reservoir, for example in earthworks and to create a stock of ''soil'' for other construction activities.
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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.
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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.
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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.
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Management of reservoir sediments, sediment washing and reuse
Vrzák, J. ; Knotek, J. ; Borovec, Jakub ; Dadejík, M. ; Krist, P.
This article is primarily intended to introduce to the expert public, especially the operators of waterworks, the new procedures for the management of sediments in water reservoirs. These include the identification of sediments, their localization, extraction, and transformation, as well as options for the sediment washing and their possible subsequent use. Presented techniques aim to find an economically feasible management solution for reservoirs affected by deteriorated water quality - cyanobacteria./nIn the years 2012 – 2014, a research project entitled “VVIF/nResearch of washing processes in dam sediments” has been conducted. One of the objectives of the project was to find suitable methods for locating the dam sediment, sampling and identification of its material composition, which is an essential prerequisite for the selection of environmentally friendly and economically efficient processes and procedures, from preparation/nto implementation of the project. Another of the key objectives was the design and test of the process of sediment washing into primary components, with/nthe option of their reuse, or the transformation process of the whole sediment inside or outside of the reservoir.
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