Supercritical Flow Over Sills

by Karam S. Karki, Asst. Prof.; Dept. of Civ. Engrg., Coll. of Tech., Pantnagar Univ., Pantnagar (Nainital), India,

Serial Information: Journal of the Hydraulics Division, 1976, Vol. 102, Issue 10, Pg. 1449-1459

Document Type: Journal Paper

Discussion: McCorquodale John A. (See full record)
Discussion: Mittal Mahendra K. (See full record)
Closure: (See full record)


Experimental investigations have been carried out to study the supercritical flow over a square section sill for all flow situations, except the jump condition. The supercritical flow has been categorized into two distinct types depending upon the ratio of the sill height to upstream depth and the Froude number. This classification also corresponds to the splashing and nonsplashing conditions. The stagnation, wake, and reattachment pressures have been investigated. The flow conditions have been explored when the downstream face pressures and the bed pressures become negative. An almost constant drag coefficient value, obtained from the present experiments, substantiated the drag characteristics of bluff bodies in open channels.

Subject Headings: Supercritical flow | Reefs and sills | Drag (fluid dynamics) | Rivers and streams | Froude number | Open channels | Pressurized flow

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