Accession Number : ADA140740

Title :   Turbulent Structure of Stably Stratified Nocturnal Slope Flows.

Descriptive Note : Interim rept. 1 Mar 83-29 Feb 84,


Personal Author(s) : Doran,J C ; Horst,T W

PDF Url : ADA140740

Report Date : Apr 1984

Pagination or Media Count : 25

Abstract : A series of measurements of the mean and turbulent structure of winds and temperatures over a simple slope during stable nocturnal flows has been carried out. Data from propeller and sonic anemometers, aspirated thermistors, and fast-response platinum resistance thermometers were recorded and analyzed. For moderate downslope flows driven by ambient winds or for winds predominantly in the cross-slope direction, the wind and temperature structure generally resembled that found over flat terrain. During drainage flows, however, the jet in the downslope wind component caused significant changes in the turbulence profiles. Turbulent kinetic energy can increase with height, and the turbulent transport of momentum can reverse sign and be directed upward. Several implications of the drainage wind structure are discussed, and future studies are outlined.

Descriptors :   *Wind, *Drainage, *Turbulence, Terrain, Slope, Air flow, Stratification, Kinetic energy, Night, Momentum transfer, Transport properties, Wind velocity, Cross flow, Atmospheric temperature, Air pollution, Diffusion, Meteorological data, Washington(State), Mountains

Subject Categories : Meteorology
      Fluid Mechanics
      Air Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE