Accession Number : ADA328903

Title :   Field Use of Intensity of Turbulence, Richardson's Number and Eddy Diffusivity to Make Diffusion Calculations

Descriptive Note : Technical rept.

Corporate Author : ARMY DUGWAY PROVING GROUND UT

Personal Author(s) : Waldron, Jr, Albert W

PDF Url : ADA328903

Report Date : Mar 1968

Pagination or Media Count : 66

Abstract : This report consists of five sections. Section 1 is an introduction to the report. Sections 2 through 5 treat related subjects. Section 2 demonstrates the accuracy to be expected from diffusion dosage calculations which make use of direct measurements of intensity of turbulence and wind speed. Section 3 uses a derived expression for the relationship of Richardson's number to intensity of turbulence and the resulting dosage calculations are discussed. Section 4 tests the universality of the derived relationship of Richardson's number to intensity of turbulence. Section 5 relates the variance of vertical wind speeds at different sites and altitudes to Richardson's number. Section 5 further treats some of the problems involved in calculating and using eddy diffusivity to make dosage calculations, and also suggests a way of calculating eddy diffusivity at heights between the top of the surface boundary layer and the gradient wind level.

Descriptors :   *EDDIES(FLUID MECHANICS), *TURBULENCE, *WIND VELOCITY, AEROSOLS, ATMOSPHERIC TEMPERATURE, BOUNDARY LAYER, DIFFUSIVITY, METEOROLOGICAL DATA, RICHARDSON NUMBER, WIND DIRECTION

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE