Assessment and Computerized Modeling of the Environmental Deposition of Military Smokes
Abstract
This report presents the average and instantaneous concentration measurements from a series of atmospheric dispersion experiments conducted under both stable and unstable atmospheric conditions. The experiments were undertaken at two different sites over both flat and complex terrain. Fog oil and hexachloroethane (HC) chemical smoke were the surface-level point aerosols used in these experiments. Depending on the site and atmospheric conditions, measurements of concentration at points along crosswind transects were taken over time periods of an hour at distances from 25m to 3000m from the source. These measurements included both aerosol photometer records for instantaneous concentration data and aspirated filter cassettes for average concentration data. The data taken in these tests compare well with developed models for both the mean and variance in concentration. Intermittency is important at all locations, with positive concentrations recorded in the mean plume centerline only 20% to 50% of the time. Concentration fluctuation intensity ranges from 2 near the plume centerline to over 20 at the plume edge. Point histograms are shown to agree with the exponential distribution for c>O. Spectra for the concentration data show an inertial-convective subrange with a 5/3-power law versus frequency behavior. Integral time scales at individual points are relatively constant within tests and are equal to the mean duration of episodes or bursts with c>O. The probability distribution of individual burst durations at each sampler shows an exponential distribution.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 05, 1990
- Accession Number
- ADA246942
Entities
People
- A. J. Policastro
- David F. Brown
- G. E. Devaull
- W. E. Dunn
Organizations
- Argonne National Laboratory