Abstract

SANDOVAL-MENDOZA, Luis Manuel et al. Mathematical Models for Flow Estimation in Sutro Weirs Used in Irrigation Systems. Rev Cie Téc Agr [online]. 2017, vol.26, n.3, pp. 30-38. ISSN 2071-0054.

The results of the research carried out in Laboratory of Fluid Mechanics and Hydraulics of Carlos de Guatemala University to develop mathematical models necessary in the flow estimation in Sutro weirs are presented in this work. Nine weirs with different values of curvature constant a (5, 10, 20, 30, 40, 50, 60, 70, 90) were produced. The experiment showed that the discharge coefficients μ are not constant and vary between 0.6532 and 0.7504. A potential model type μ=7.86x10^-4a^-0,0274 was proposed for the correction of the discharge coefficient which greatly improves the accuracy of Sotelo´s equation. To estimate mean water speed in each weir, water depth with values greater than 65% of the maximum water depth should be used, in order to reach minimal speed variations. A mathematical model that relates mean speed and a constant with a correlation coefficient of 0.8961 was found

Keywords : calibration; discharge coefficient; hydrodynamic canal; flow mensuration.

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