The article presents the results of a study of the mode of inflow and dynamics of sedimentation on the inlet part of the canal. The results of field studies of the state of the channel situation in the supply channels of pumping stations are studied. The process of siltation of the head sump of pumping stations is analyzed. A method for regulating solid runoff into the inlet sections of the canal has been developed. And also by the nature of the change in the hydraulic elements of the flow, the time of siltation of the sump and cleaning the length of the investigated section of the channel were determined. Based on the results of a full-scale study of the supply channel, a recommendation was developed to improve its operation.
The increasing demand for improved irrigation systems in the world requires a more comprehensive and widespread study of the reliability and safety of hydraulic structures. In this regard, increasing the reliability during the operation of hydraulic structures of irrigation systems, especially on collapsible soils, is very important because loess subsidence soils are widespread globally, a significant part of loess rocks are also found in Central Asia, including the Republic of Uzbekistan. This article discusses the study of the features of the joint work of full-scale irrigation structures with their loess subsidence bases and the intense - deformative state of subsidence foundations during their joint work with hydraulic structures on irrigation canals of the Kashkadarya region.
One of the most important tasks in designing and constructing reclamation network structures on loess subsidence soils is to ensure their long-term trouble-free operation. The improvement of methods for the design of hydraulic structures on subsidence foundations requires further study of very complex physical processes occurring in the foundations of structures during their construction and operation. This is confirmed by the fact that even if all the requirements and recommendations of regulatory documents for the design of irrigation systems on subsiding soils are observed, the deformations of the foundations of structures often significantly exceed the calculated ones, which can cause a loss of serviceability of irrigation structures. This determines the need for further study peculiarities of interaction of irrigation structures with their subsidence bases. This article is devoted to this problem, in particular, to the study of the influence of stress redistribution in wetted subsidence foundations of hydraulic structures on the stressed state of their elements and the stress-strain state of loess subsidence foundations on the models of float bets of hydraulic structures in the Karshi steppe.
The construction of large water reservoirs on level rivers has dramatically changed the nature and dynamics of channel processes in the upstream and downstream rivers. The purpose of the research is to study the relationship between the morphometry of the riverbed and the parameters of the waterworks rigged by the reservoir. To analyze the dynamics of the flow's channel morphometry and hydraulic elements, the lower course of the Amu Darya River, which is characterized by intense channel processes, was chosen. The study was carried out using field data on the Tuyamuyun gauge, located 1.8 km below the hydroelectric complex. The period for the last 25 years is covered, and 6 multi-year periods are selected from these. As a result of data analysis from long-term field studies and hydrometric measurements on the Tuyamuyun hydraulic section of the Amu Darya River, functional relationships have been established between the morphometric parameters of the channel and the hydraulic parameters of the flow. The relationship between the roughness of the channel and water flow is ambiguous. This is explained by the fact that the target is in the zone of the general spreading of the channel, and the bottom of the channel was observed to sink. When establishing the hydraulic resistance of the downstream, i.e., the relationship between the morphometric parameters of the channel and the hydraulic parameters of the flow, it is possible to predict changes in the water level and the state of water intake facilities. According to forecasts, it is possible to determine the type of event that allows for the supply of estimated flow rates through water intake facilities located in general erosion of the Tuyamuyun water reservoir.
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