VERTICAL DOSAGE PROFILES BASED ON EDDY DIFFU SIVITIES DERIVED FROM VERTICAL VANE DATA,
Abstract
A technique is described for estimating values of vertical eddy diffusivity directly from vertical vane data by expressing the observed magnitude of the vane angle deflections as a function of time. Values for eddy diffusivity are computed at heights up to 300 feet under stability conditions varying from strong inversion to nearly adiabatic lapse. It is found that the computed eddy diffu sivities increase by three orders of magnitude as the stability decreases from strong inversion to nearly adiabatic lapse. For six field trials in volving elevated and surface line releases of fluorescent particles, the computed values for eddy diffusivity are used in a modified form of Pasquill's diffusion equation for infinite line sources to compute vertical dosage profiles at heights up to 750 feet and at downwind dis tances up to ten miles. It is shown in a trial by-trial comparison that the extent of agreement between calculated and observed dosage profiles indicates the values for eddy diffusivity com puted by this method are at least of the correct order of magnitude. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 07, 1963
- Accession Number
- AD0418596
Entities
People
- David T. Prophet