Study of Flow Characteristic of Trapezoidal Labyrinth Weir

Abstract

AbstractA trapezoidal labyrinth weir is characterized by a broken axis in the plan to increase the crest’s effective length. Labyrinth weirs provide an increase in crest length for a given channel width, thereby increasing flow capacity for a given upstream head. A physical or experimental study based on the design and analysis of trapezoidal labyrinth weirs is presented in this study. Hydraulic model tests of the weir showed that the behavior of the labyrinth weir was convenient and that the discharge capacity presented a good agreement with theoretical calculations. It is the purpose of this paper to present a satisfactory developed physical model of labyrinth weir flow and provide engineers with a model capable of dealing with a variety of labyrinth weir configurations and flow conditions. The preliminary hydraulic calculations results indicated that hydraulic jump with estimated low Froude numbers (Fr1), of about 2.7–3.0, is supercritical at its downstream, and it enhances with the slope of the weir. This study of labyrinth weir is performed between head to crest ratio, apex width, vertical aspect ratio, approach, and conveyance channel conditions that increased the discharge capacity of labyrinth weir and design of trapezoidal labyrinth weir.KeywordsTrapezoidal labyrinth weirHydraulic modelPhysical modelFroude numbersDischarge coefficient