VERTICAL TRANSPORTS OF KINETIC ENERGY BY TURBULENCE AND PRESSURE IN THE BOUNDARY LAYER.

Abstract

The transport of energy by turbulence and pressure is examined for a turbulent surface layer over a dry prairie grassland. Both terms are found to be significant in the budget of turblent kinetic energy. The values of the divergences are deduced by considering the variations of the non-dimensionalized terms with respect to z/L. The dissipation of turbulent kinetic energy about equalled the local production. The spectral components of the energy budget are briefly examined. It is found that the non-dimensional frequency range with no appreciable production nor dissipation was only about a decade wide whereas the spectral flux was constant to within 10% over about a two-decade band.