The article describes the definition of filtration flow gradients in the dam's body on the example of the Kattakurgan reservoir, the analysis of the reasons for their change in cross-section. Evaluation of the aggressiveness of the filtration flow in the dam's body plays an important role in ensuring the stability of the reservoir dam and its parts. To assess the aggressiveness of the filtration flow in the dam's body, it is necessary to know the action pattern of the filtration water in the reservoir dam and its effect on the elements of the dam. In addition, the chemical composition of the water in the piezometers was analyzed in the laboratory to determine the aggressive effect of sulfate elements on the piezometers and their corrosion. Measures on the observations of systemic piezometers were also mentioned.
The advantages of using aconfuser section in the outlet part of the vortex spillwayare shown in the paper; they may be more rational in terms of ensuring cavitation-free operation of the flow swirler. An analytical method for calculating the aerated swirling flow in the confuser section of the vortex spillway is presented, as well as its correspondence to experimental results, which allow us to quickly and accurately conduct the distribution analysis of axial and tangential rates in the swirling flow along the length of the confuser at different taper angles.
The article provides an analysis of accidents and their main causes in existing reservoir hydro-systems in the world. Besides, the article presents the diagram for accident causes in reservoirs. Risk category assessment is given for Langar, Kizilsuv and Kalkamaflood-reservoirs. According to available data from the Congress on large dams, currently there are no regulations on risk assessment for water reservoir hydro-systems in Uzbekistan. In addition, major security challenges and recommendations are presented to improve the operation of water reservoir hydro-systems.
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