Análisis de la variabilidad espacial de los perfiles de velocidad en canales abiertos con elevada rugosidad

Abstract

In open channels, the spatial variability of the velocity distribution is affected by the distribution of the roughness of the bottom and sidewalls of the channel. The present investigation aims to analyse velocity profiles in open channels by evaluating data recorded at the "Grandi Modelli Idraulici" laboratory of the University of Calabria (Italy). The bottom roughness that affects the water flow behaviour was considered to compare the velocity and shear profiles obtained in the laboratory with the theoretical shear stress; Matlab language was used to process data and elaborate graphs. Fifteen velocity profiles were measured, approximately 35 points each. The tests were carried out in a uniform permanent flow condition and the velocity data were processed in intervals of 300s per point; in each section, the velocity varies between -0.5m/s and 1.0 m/s, the velocity ranges of the despiking process vary between -0.2 m/s to 0.7 m/s, the latter being the values for the analysis. In conclusion, viscous stresses range from -0.01 Pa to 0.02 Pa, turbulent shear stresses from -0.5 Pa to 3 Pa, and shear stresses from -0.5 Pa to 3 Pa, the latter values showing the preponderance of turbulent effects concerning the viscosity of the fluid.