-3-
One of the major coces that was mocitied ts watHen?), itS Qurpose 1s to
agiust observed winds, using variational analysis methods, so as to conserve muss
from cell to cell. After modification, all observed uoper air wind data from 1) mto
33 Km were entered as input. This vas done for four time periods, using winds for
one to three observing stations for each time. The oovious advantages of this code
(over most other fallout codes) is that mass is not permitted to accumulate in anv of
the cells and wings are available for each 3-D call intersection for four times.
J
Tne MATHEWwinds are used then by the modified appicl? particle-in-cell
code to calculate the transport, diffusion, and deposition of an
source.
allowing
instantaneous
Modifieations required of ADPIC, to handle the Bravo test, consisted of
more
upper
air
input
than
is
used
in
typical
ARAC
assessments.
furthermore, since particles falling from the stratosohere undergo a larga increase
in air density, it was necessary to add a turdulent wake correction to the larger
.
.
.
[.
Oarticles; this correction follows the method set forth by MeDonala!?
modifications were to incorporate a
tropical atmosphere
into the
fall
|
Other
velocity
caleuations and to make the particle activity increase as the cube of particle
radius.
Finally, time-integrated ceposition was added; this allows calculation of the
total cose from cetonation time to evacuation.