Justification of the efficiency of operation of combined stilling devices of irrigation structures of the agro-industrial complex

This article presents the results of experimental studies of flow energy damping conditions in deep stilling basins. Based on a review of approximately fifteen designs, the most effective damper was selected as a deep but relatively short basin, positioned in the middle zone of the bottom of the piers behind the spillway’s transition section slope at an inclination angle of 40° to 75°. The objective of the study was to develop a flow chart for determining the optimal parameters of a combined damper. Graphical dependences, formulas approximating them, and the results of verification of the software package for conducting the numerical experiment are presented for a wide range of Froude numbers. It was found that damper efficiency increases with increasing Froude number. Conditions are noted where, with a relatively small depression in the stilling basin bottom (no more than 2.5 times the critical flow depth), the length of the basin, compared to a standard one, is reduced by up to 65%.

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