COLD REGIONS TECHNICAL DIGEST NO. 96-1
14
Approximate Path of
Maximum Surface Velocity
Boom
Un
its
Boom
Cable
0
100 ft
0
30.5 m
1990-'91
Ice Boom
3 ft
Cable
(0.9 m)
2 ft
(0.6 m)
5. Salmon River boom.
Connector
Note that the boom is
Chain
aligned at an angle to
20 ft
(6 m)
the path of maximum
surface water velocity.
PLAN VIEW
END VIEW
the greatest depth and the highest current velocity is in the vicin-
ity of the channel center. If the boom is oriented with the chord at
an acute angle to cross-stream direction, the point where the
boom is perpendicular to the flow is shifted away from the path of
maximum surface velocity (Fig. 4e and 5).
Geometry of
The following discussion is based on boom geometry as shown
boom and wire
in Figure 6. Relationships exist between the location of the anchor
rope tension
points, the unstressed length of wire rope S0, the sag ratio s, and
the tension in the main support cable T. The sag ratio is defined as
the ratio of the midspan deflection, dmidspan, to the perpendicular
length L. Assuming a uniform loading across the river width
results in a parabolic shape for the ice boom cable. For most
applications, this shape is a reasonable approximation of the ac-
tual ice boom geometry.
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