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Calculation of Contraction Coefficient under Sluice Gates and Application to Discharge Measurement |
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| Authors: | Gilles Belaud Ludovic Cassan Jean-Pierre Baume |
| Affiliation: | 1Assistant Professor, UMR G-EAU, SupAgro 1, place Pierre Viala, 34060 Montpellier Cedex 1, France (corresponding author). E-mail: gilles.belaud@supagro.inra.fr 2Researcher, UMR G-EAU, SupAgro 1, place Pierre Viala, 34060 Montpellier Cedex 1, France (corresponding author). E-mail: ludovic.cassan@supagro.inra.fr 3Research Engineer, UMR G-EAU, Cemagref, 361 rue Jean-Fran?ois Breton, 34196 Montpellier Cedex 5, France. E-mail: jean-pierre.baume@cemagref.fr |
| Abstract: | The contraction coefficient under sluice gates on flat beds is studied for both free flow and submerged conditions based on the principle of momentum conservation, relying on an analytical determination of the pressure force exerted on the upstream face of the gate together with the energy equation. The contraction coefficient varies with the relative gate opening and the relative submergence, especially at large gate openings. The contraction coefficient may be similar in submerged flow and free flow at small openings but not at large openings, as shown by some experimental results. An application to discharge measurement is also presented. |
| Keywords: | Gates Contraction Coefficients Hydraulic structures Potential flow Submerged flow Free flow Discharge measurement |