ESTIMATION OF FLOW DISCHARGE UNDER THE SLUICE AND RADIAL GATES BASED ON CONTRACTION COEFFICIENT

Abstract

Sluice and radial radial gates are common devices used for flow control in hydraulicstructures. This paper demonstrates the variation of the contraction coefficient of sluice gates andthree types of radial gates (namely, Hard-Rubber, Sharp and Music Note gates) by using Energyand Momentum Equations (EMEs). This paper presents a novel method for estimating the actingforce behind these gates under free and submerged flow conditions. A minimum value of thecontraction coefficient for sluice gates was obtained under a certain value of relative gate opening.Under a specific condition, Hard-Rubber gates have a larger contraction than Sharp gates, whileMusic Note gates have the least contraction. It is recognized that the contraction coefficientdecreases as the gate lip angle and the gate opening increase. Under submerged flow conditions,the contraction coefficient of sluice and radial gates would be either increased or decreaseddepending on the level of flow submergence. It is concluded that using the proposed contractioncoefficient in estimating the discharge coefficient demonstrates an acceptable accuracy.