Abstract
The paper analyzes the dynamics of planned and deep deformations on the section of the Amudarya River in the area of the damless water intake in the main structure of the Karshi Main Canal-KMC. The results of field studies of the state of the canal situation of the Amudarya River at the site of a damless water intake are studied. The course of riverbed processes in the riverbed is studied. Recommendations for improving water intake conditions have been developed. According to the results of the field survey and the study of the head section of the supply canal, the state of the Amudarya riverbed in the water intake zone was assessed. The results of surveys of the hydraulic and pumping modes of sediments of the Amudarya River in the area of the damless water intake are analyzed and summarized. The results of field studies of the canal situation of the Amudarya River in the water intake area in the Amudarya River KMC in the area of the Karshi head water intake are studied. The riverbed situation is not characterized by constant hydraulic characteristics over time for the same water flow rate, i.e. with the same water horizon marks, the flow rates may differ from each other by about half, and with the same flow rates, the horizon marks may vary up to ± 0.6 m. This is explained by the extreme instability and high mobility of the canal, and large deformations of the canal occur in a short time. The hydraulic regime of the river is characterized by a significant redistribution of speeds, depth and width of the flow. The range of their changes is within: Maximum speed >Vmax =2…5 m/s; average speed Vav = 0.5…2.5 m/s; depth H max = 4…14 m, Hav = 1…5 m; width B = 300…2000 m; slope i = 0.00016…0.0003. It is established that the characteristic feature of the river is that at a constant flow can have different average velocities depth and width, for example, when Qw = 1000 m3/s, respectively, v = 0.6…1.7m/s, B = 180…1030m, Hav = 1.1…4.3m.
Highlights
A difficult situation has arisen at the head structure of the damless water intake to the Karshi Main Canal (KMC), in the head of which there is no control structure, and the operating mode of the first pumping station was developed for the conditions of the dam water intake at the Kyzylayak section
In order to study the intensity of the riverbed re-formation in the area of the damless water intake in the KMC and to develop measures to maintain a stable water intake during the low-water period (October), planned surveys of the riverbed above (3 km) and below (2 km) the water intake point were carried out for several years (Fig.1)
As a result of the gradual withering away of the left sleeve along which c. 60% of the discharge flowed in pain, the main river flow began to pass along the middle branch and, joining the right branch, formed a single canal at the approach to the water intake point and downstream, along which up to 90% of the river flow passed
Summary
The change in the hydrological regime of the river under the influence of water intake or. Increases the character of the intensity of canal deformations of the river All this significantly changes the natural course of the riverbed process, which leads to a deterioration of the water intake conditions in the head structure. The problem of studying and developing the theory of riverbed processes, coastal and deep deformations of the riverbed under the influence of water intake structures, quantitative and qualitative changes in riverbed flows has always attracted the attention of scientists around the world [10,11,12,13]. The analysis of the results of field studies to determine the intensity of the deep and coastal deformation of the Amudarya river in district headwork damless water intake and on the basis of the obtained results to develop recommendations for improving its operation is defined as the main goal of the present work
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