Field Calibration of Submerged Sluice Gates in Irrigation Canals

Abstract

Four rectangular sluice gatcs were calibrated for sLlbniergcd-tiow conditions using nearly 16.000 field-measured data points on Canal B of the B-XIl irrigation scheme in Lebrija, Spain. Water depth and gate opening values were measured using acoustic sensors at each of the gate structures, and the data were recorded oil data loggers. Several gate calibration equations were tested and it was found that the rectangular sluice gates can he used for accurate flow measurement. The Energy-Momentum (E-M) equations proved to he sound. The calibration of the contraction coefficient. 10 he used in the energy equation. allowed good estimations of the discharge for three of the four g ates studied. The gate for which the E-M method did not perform satisfactorily was located at the head of the canal with a unique nonsyinnietric approach flow condition. Alternatively, we investigated the performance of the conventional discharge equation. The variation of the discharge coefficient, C,, with the head differential. ./i. and the vertical gate opening. c. suggests that C, he expressed as a function of these two variables. For the sluice gates considered in this study, the best empirical fit was obtained by expressing Cd as a parabolic function of w. although an exponential expression tested previously by other writers also produced satisfactory results. The greatest uncertainty in the variables considered in this study was in the calculated coefficient of discharge, and based on the uncertainty anal y sis, it is possible to quantify the uncertainty in the estimated discharge through a calibrated sluice gate. The discharge uncertainty in each of the four gates in this study decreases with increasing gate opening, and it decreases slightly with increasing head differentials.

The Ratio Controller for Regulation of Turnout Flow Rate

“…Lozano et al (2009) point out that the discharge coefficient for submerged orifice gates varies with gate opening and other factors. Lozano et al (2009) tested several equations for their flow measurement accuracy for field gates.…”

“…This equation was selected for its simplicity and ability to represent realistic gate behaviour. This equation provided the best empirical fit among several alternatives tested by Lozano et al (2009).…”

Analysis of Simulation Outputs for the Mutual Effect of Flow in Weir and Gate System

“…For submerged flow, the above original literatures have good theoretical explanation more over the practical study of Lozano et al [20] with wide empirical reviews of literature find that coefficient of discharge (Cd) as a parabolic function of the gate opening, d. The discharge equation (2) is:…”

Calibración y simulación de un sistema regulado de suministro de agua a través de técnicas de Monte Carlo

“…Es importante tener en cuenta que en este trabajo, la formulación de las compuertas transversales no está sujeta a calibración como en el caso reportado en Lozano et al, 2009. En las siguientes secciones se detallan las razones de esta decisión y se asume por tanto, que la sensibilidad del error de las medidas está afectada principalmente por los errores derivados de una mala interpretación del funcionamiento de la toma lateral.…”