Notes on Atmospheric Stability, Turbulence, and Its Measurements.
Abstract
Modernization of Dugway's diffusion test capabilities include the procurement of state-of-the-art instrumentation and an upgrade in data collection methodology and modeling. Dispersion of a buoyant, passive plume is due to transport by mean atmospheric motions. Although K-theory and Gaussian diffusion equations are burdened by restrictive assumptions, these equations offer the most practical means of modeling the effects of turbulence on diffusing material. Turbulence occurs as vortex stretching in a sheared environment causes an energy cascade towards progressively smaller eddy sizes until viscous dissipation occurs. Direct turbulence measurements require an assortment of instrumentation due to the range of eddy sizes. Consequently, it is most economical to estimate turbulence from stability parameters and most models accept such turbulence estimators as input. The Obukhov Length, stability parameter obtained from principal turbulent *MSG DI4 drols processing-LAST input iGNORED ower profile data using flux-gradient relationships. LED scintillometers, acoustic sounders, radiometers, precision thermometers, and sonic anemometers are needed to upgrade Dugway's turbulence measurement capabilities. Data from these instruments will help define test go/no-go conditions, improve quality control, enhance posttest analysis capabilities, and provide improved input for diffusion modeling. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1985
- Accession Number
- ADA155230
Entities
People
- C. A. Biltoft