Abstract
An engineering spectral model of turbulence is developed with horizontal wind observations obtained at the NASA 150-m meteorological tower at Cape Kennedy, Fla. Spectra, measured at six levels, are collapsed at each level with [nS(n)/u*02,f]-coordinates, where S(n) is the longitudinal or lateral spectral energy density at frequency n(Hz), u*0 the surface friction velocity, and f = nz/ū, ū being the mean wind speed at height z. A vertical collapse of the dimensionless spectra is produced by assuming they are shape-invariant in the vertical.
An analysis of the longitudinal spectrum in the inertial subrange, at the 18-m level, implies that the local mechanical and buoyant production rates of turbulent kinetic energy are balanced by the local dissipation and energy flux divergence, respectively.
