Efecto de la granulometría en el transporte de sedimentos

Abstract

In this work the sediment transport in function of the densimetric Froude number is calibrated. The study is based on a 46 experiments set realized with gravel of average diameter D50 = 0,0071 m. The obtained function is applied to the ideal condition of uniform diameter finding relatively moderate error compared with the transport measurements. Then the transported sediment is divided in fractions of characteristic diameters Di and diverse methodologies to calculate the sediment transport are applied. As a result, all of them compared with the measured values produce great error estimations, but if the Karim exposition and hiding correction (1998) is applied to the calibrated transport ratio the calculating error found, with the unique diameter D50, diminishes appreciably. It is recommended thus, to divide the sediment carried in fractions and to determine the transport of each fraction. This way the average error on transport estimation is reduced from 184% for diameter D50 to 102% for the diameters corresponding to the different fractions.