Conclusions
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1.
The hydraulic resistances of a large unlined canal in noncohesive soils (for conditions of a clarified flow) are determined by the uniqueness of the hydraulic regime during establishment of relative stabilization of all main elements of the flow and channel.
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2.
The use of the kinematic index x, characterizing the rate of change in velocities vertically and being a function of the hydraulic resistances, as a criterion of the mobility of bed forms makes it possible to estimate the state of stability of dune forms on various stretches of a large irrigation canal running in an earth channel.
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3.
An arbitrary assignment of the roughness coefficients n is impermissible when determining hydraulic resistances and longitudinal gradients of a large unlined canal with channel-forming elements. The hydraulic gradients providing longitudinal stability of a straight channel can be predicted both by the traditional method (in terms of n) but with consideration of the regular variability of n and on the basis of the established relationship between hydraulic resistances and the channel shape parameter.
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Literature cited
V. S. Altunin, Reclamation Canals in Earth Channels [in Russian], Kolos, Moscow (1979).
A. D. Al'tshul', Hydraulic Resistances [in Russian], Nedra, Moscow (1982).
H. J. Koloseus, “Rigid boundary hydraulics for steady flow,” in: H. W. Shen. (ed.), River Mechanics, Vol. 1, Chap. 3 (1971).
R. M. Haynie and D. B. Simons, “Design of stable channels in alluvial materials,” Proc. ASCE,94, No. 6 (1968).
Additional information
Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 8, pp. 18–21, August, 1987.
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Altunin, V.S., Larionova, L.V. Hydraulic resistances of large unlined canals in noncohesive soils. Hydrotechnical Construction 21, 466–470 (1987). https://doi.org/10.1007/BF01424780
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DOI: https://doi.org/10.1007/BF01424780