CERTAIN PECULIARITIES OF THE DISTRIBUTION OF THE COEFFICIENT OF TURBULENCE IN THE BOUNDARY LAYER (NEKOTORYE OSOBENNOSTI RASPREDELENIYA KOEFFITSIENTA TURBULENTNOSTI V POGRANICHNOM SLOE),
Abstract
Various methods are considered for calculating the coefficient of turbulence along the vertical in a boundary layer. Methods for calculating the coefficient of turbulence at isolated levels in the boundary layer are analyzed. The coefficient of turbulence in ascending and descending flows is calculated for the case of fluctuations above various types of terrain. It is found that a characteristic feature of the coefficient of turbulence in the boundary layer is fluctuation due to pulsations in the structure of the air flow under various atmospheric conditions. Consideration is given to the effect which terrain and the structure of the underlying surface have on the distribution of the coefficient of turbulence. It is found that deformation of the air flow by forests during the summer causes a maximum in the coefficient of turbulence at an altitude of about 100 m which reaches an altitude of 200 m as the air moves over the densest part of the forest. A rather thick layer with thermal instability is observed during the daylight hours in July over semi-desert areas, while a temperature inversion with attenuation of turbulence was observed above cotton fields, particularly during irrigation. Typical profiles for the coefficient of turbulence are given. Several examples are given to illustrate calculation of profiles for the coefficient of turbulence in a boundary layer. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 08, 1967
- Accession Number
- AD0673181
Entities
People
- P. A. Vorontsov
Organizations
- National Air and Space Intelligence Center