Order number “set 5 with1OFRICKAL-USE ONLY
page 32
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801.
KEYWORD (S)
possible to calculate the stiffness changes caused by
the blast loading. Calculated values of the preshot
frequencies, assuming a rigid foundation, were
considerably greater than the measured values. Ground
stiffnesses calculated from the measured frequencies
appear to be of the correct order of magnitude. Damping
ratios calculated from the resonance curves are low
compared with values obtained by other experimenters.
GREENHOUSE/ground motion ;STRUCTURES/blast loading
7 GREENHOUSE; STRUCTURES
Item 56
150.
110.
70.
710.
371.
34.
950.
REPORT NUMBER
PRIMARY TITLE (M)
PERSONAL AUTHOR( M)
CORPORATE SOURCE
PUB. DATE (YYMMDD )
CLASSIF. LEVEL T EXT
ABSTRACT
NOLTR--64-103
Physics of the base surge
Young, G.A.
Naval Ordnance Lab.,
White Oak,
underwater nuclear explosion
801. KEYWORD(S)
MD
(USA)
650617
Unclassified
The column and base surges formed by the
(Test Baker)
in Operation
Crossroads in 1946 were measured in detail. The new data
were used to formulate a physical explanation of the
base surge behavior and to develop prediction
techniques. The primary surge originated as a spillout
of sea-water jets which broke into spray and formed a
dense toroidal shaped cloud. Computations were made for
the coalescence and rainout of drops and a theory was
developed for the mixing of the surge with the air. The
late behavior was strongly influenced by the
convectively unstable atmosphere and the high relative
humidity. The effects of other meteorological conditions
were described. 232 references.
BAKER BURST/base surge ;BAKER BURST/column
formation ;HUMIDITY
Item 57
150.
110.
70.
710.
371.
34.
950.
NOLTR--62-191
REPORT NUMBER
PRIMARY TITLE (M)
PERSONAL AUTHOR( M)
CORPORATE SOURCE
PUB. DATE (YYMMDD )
CLASSIF. LEVEL T EXT
ABSTRACT
Liquid model studies of the base surge
Swift, E. Jr.
Naval Ordnance Lab.,
White Oak,
MD
(USA)
621001
~
Unclassified
When a constrained column of dense liquid standing
on the bottom of a tank of water is released suddenly,
it sinks and flows outward radially along the bottom.
This action simulates the early motion of the base surge
from shallow underwater explosions. Such liquid model
experiments are described, scaling laws are derived, and
IO034Ob
OFFICIAL USE ONLY