Formulation of Vertical Distributions of Wind Velocity and Eddy Diffusivity near the Ground

Abstract

The equation of wind shear proposed by Yamamoto and Shimanuki which is a modified form of so-called KEYPS equation is solved approximately. The approximate formulae of wind shear are rational expressions of|ζ| ^1/2 and |ζ|^1/3, whereζis defined by the ratio of height and stability length. Relative errors involved in the approximate formulae of wind shear, wind velocity and eddy diffusivity do not exceed 0.4 percent under unstable conditions and 0.6 percent under stable conditions. Function subprograms used for computing velocity and diffusivity by electronic computer are written by FORTRAN language.