ABSTRACT
Instantaneous velocity components have been measured in the vertical and the mean flow directions in a two-dimensional open-channel flow. The results indicate the existence of large-scale structures superimposed on background small structures of isotropic behaviour. From the measured data the statistical properties of these structures, such as their contribution to the Reynolds shear stress, duration periods, frequencies, and the time periods between their occurrence have been determined throughout the water depth. From the measured data the auto-correlation functions and the energy spectra of the horizontal and vertical velocity fluctuations and their product have been evaluated.
