PREDICTION OF SUBSURFACE-DETONATION FALLOUT
in Ref.
335
7. The author believes that this coincidence of maximumsat
z/W* = 30 is physically consistent.
Cloud Geometries
The geometrical definition of the top, the base, and the radius of
both the main cloud and the base surge at the time of cloud stabilization is shown in Fig. 2. In addition to the definitions given in Fig. 2, the
|
|
H,,, BASE-SURGE HEIGHT
MAIN CLOUD
(
E
|
R,, BASE-SURGE RADIUS
R,, MAIN-CLOUD RADIUS
I
l
x
Hy», MAIN- CLOUD HEIGHT
:
t
Ter
=}
Yoo
BASE SURGE
777 4 To
SURFACE ZERO —~™” bx
Fig. 2—Definition of cloud dimensions and symbols.
height of the base of the main cloud is definea as being equal to the
height of the base-surge top, H,, in the model.
Evidence suggests that the geometry of these two clouds at the
time of stabilization is a function of the total explosive yield, the ma-
terial in which the detonation occurs, the depth of burial of the explosive, and the meteorological conditions existing during the development
of the clouds.’ At present, the cloud-geometry parameters (Ri, Hy, Rm;
and H,,) must be evaluated experimentally as functions of total yield
and depth of burial. Reasonable samples of experimental data exist for
alluvium and basalt materials. Examples from one of the most useful
summaries of cloud-geometry data for alluvium® are shown in Figs. 3b
to 3g. (Figure 3a is a computational aid to the acquisition of input to
Figs. 3b to 3g. In these figures, zdenotes depth of burial and D, denotes
the depth of apparent crater.) This summary utilizes all the known