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Irrigation and Melioration

Abstract

The paper analyzes the dynamics of channel processes based on the results of field studies of the Amudarya River at the site of the damless water intake to the Karshi Magistralny Canal (KMK) and developed recommendations for improving the water intake conditions. Based on the results of field studies of the head section of the inlet channel, an assessment of the state of the Amudarya river bed in the water intake zone was made. The results of studies of the hydraulic and alluvial regimes of the Amu Darya River in the area of the damless water intake are generalized The channel situation in the area of water intake at the KMK differs in the inconsistency of hydraulic characteristics over time for the same water flow rate, i.e. at the same water level, the flow rates can differ from each other by about half, and at the same flow rates, the level can fluctuate up to ± 0.6 m.This is explained by the extreme instability and high mobility of the channel, and large channel deformations occur in a short time. The hydraulic regime of the river is characterized by a significant redistribution of velocities, depths and flow widths. Their range of variation is within: maximum speed Vmax= 2-5 m/s; average speed Vav = 0.5-2.5 m/s; depth Нmax = 4-14 m, Нav = 1-5 m; width B = 300-2000 m; slope J = 0.00016-0.00030. A characteristic feature of the river channel is that at a constant flow rate there can be different values of the average velocities, depths and widths of the channel, for example, at QR = 1000 m3/s, respectively, V = 0.6-1.7 m/s, B = 180-1030 m, Hsr =1.1-4.3 m.

First Page

39

Last Page

43

References

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