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FIELD VALIDATION OF EXPOSURE ASSESSMENT MODELS. VOLUME 1. DATA
Citation:
Doran, J., O. Abbey, J. Buck, D. Glover, AND T. Horst. FIELD VALIDATION OF EXPOSURE ASSESSMENT MODELS. VOLUME 1. DATA. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/3-84/092A.
Description:
This is the first of two volumes describing work done to evaluate the PAL-DS model, a Gaussian diffusion code modified to account for dry deposition and settling. This first volume describes the experimental techniques employed to dispense, collect, and measure depositing (zinc sulfide) and nondepositing (sulfur hexafluoride) tracers. The measured concentrations of the tracers form a data set by which the PAL-DS model may be tested. These concentrations are given in tabular and graphic form for five downwind distances from the release point, ranging from 100 to 3200 m, and as a function of azimuthal angle. Measurements of wind speed, direction and temperature at seven heights from 1 to 61 m were taken during the tracer releases. These data are also included, along with evaluations of several parameters describing the turbulence characteristics. A discussion of particle size distributions of the depositing tracer is given, and the calibration and quality assurance procedures used for sample analysis are described. Two chlorocarbon tracers were also used in the tracer releases, but with little success. The first volume concludes with a discussion of the problems encountered with these tracers and some recommendations for possible solutions.