Similarity in Unlined Irrigation Canal Systems

by Kenneth V. H. Smith, (M.ASCE), Lect. in Civ. Engrg.; Southampton Univ., Southampton, England,

Serial Information: Journal of the Hydraulics Division, 1970, Vol. 96, Issue 1, Pg. 13-28

Document Type: Journal Paper


Data from three irrigation canal systems are examined, and the observed variations in some relevant flow parameters are considered in relation to the conditions which apply in the case of completely similar movable bed channel flows. It can be seen that the canals flow with ripple, dune, or transitional bed regimes, and that the bed material size decreases in a downstream direction in such a way that the ratio of the mean velocity of flow to the fall velocity of the bed material tends to remain constant. It is shown that it is impossible for complete similarity to exist between the flows in real alluvial channels, and accordingly an attempt is made to define conditions of quasisimilarity based on the stage of development of the bed formation.

Subject Headings: Irrigation systems | Bed materials | Channel flow | Alluvial channels | Canals | Fluid velocity | Parameters (statistics) | Case studies

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