Abstract
The two-dimensional spectra of wind fluctuations in a horizontal plane in the surface boundary layer of the atmosphere are obtained, which are calculated from a simple model founded upon the experimental formulate of the one-dimensional power spectrum and upon the coherence between velocities at two points.
The variations of the two-dimensional spectra obtained from the present model with a height and a decay parameter are discussed.
The two-dimensional spectra are . obtained as a function of the non-directional wave numbers, and their features in the wave number range corresponding to the inertial subrange are discussed in relation to the decay parameter.
Applications of the two-dimensional spectrum to the engineering are briefly mentioned. The one-dimensional spectrum of wind fluctuations spatially averaged over the lateral distance, which is of use for the estimation of the wind load on the line-like rigid structures, is obtained making use of the two-dimensional spectrum.
