Chopter 3
RESULTS
The results of the crater surveys are summarized in Table 3.1.
3.1
LACROSSE
Figure 3.1 is 4 preshot phultograph of the Lacrosse area. Figure 3.2 is a postshot
photograph of the same area; on this photo, line A-B has been drawn to represent the
track the survey boat followed while making the lead-line soundings. The results of the
preshot and postsiot surveys are presented in Figure 3.3. On this and all other profiles,
zero elevation has been taken as the datum plane on which tide tables are based: 0.5 feet
below mean-low-water spring.
Figure 3.4 depicts the contours of the crater determined
by photogrammetry.
3.2
ZUNI
Figure 3.5 is a preshot and Figure 3.6 is a postshot photograph of the Zuni area. Figure 3.7 depicts the contour of the crater area as found by photogrammetry measurements.
Rays 1, 2, 3, 4, 5, and 6 represent the rays of the preshot survey; Table 3.2 gives the
findings in tabular form. Lines A-A', B-B', C-C', D-D’', E-E’, F-F', and G-G! represent the track the survey boat followed while making the lead-line soundings; and Table
3.3 gives the findings in tabular form. Figure 3.8 is a plot of depth measurements versus
distance froin ground zero. The basic data have been corrected to indicate the distance
below the datum plane. The curve was drawnas a representative profile of the crater.
3.3
SEMINOLE
Figures 3.9 and 3.10 are the preshot and postshot photographs of the Seminole area.
Figure 3.11 depicts the contour of the crater area as found by photogrammetry measurements. Figure 3.12 represents the preshot and postshot survey rays. Figure 3.13 presents profiles of the preshot survey and postshot lead-line soundings.
The device position and surroundings for Seminole require explanation, because it is
felt that they had considerable influence on the resultant crater. The nuclear device was
placed in a 15-foot-diameter tank, which was itself inside a 50-foot-diameter tank of water.
A sketch of this is shown in Figure 3.14. The effects of this tank of water are largely dependent on its size relative to the size of the isothermal sphere in water at hydrodynamic
separation. It scems, as will be discussed in Chapter 4, that the tank was sufficiently
large for the yield of the Seminole device to go from radiative transport to shock before
the isothermal sphere reached the outside of the tank. It is possible that this would affect
the crater in two ways: (1) better coupling of energy to the soil and (2) a nonsymmetrical
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