3
Results
Introduction
Three-dimensional stability experiments were conducted for nine configura-
tions at a model scale of 1:48.4. The configurations consisted of two basic
breakwater plans. Plan 1 and Plan 2 differed in that Plan 1 consisted of 8- and
11-tonne Core-Locs and a crest elevation of +5 m CD at the head section,
whereas Plan 2 was armored entirely with 11-tonne Core-Locs and had a head
section elevation of +8 m CD. Four toe protection schemes were studied using
the Plan 1 configuration, and five toe configurations were used with Plan 2.
Plan 1
Plan 1, the initial plan (Figure 10, Photos A1 through A3), consisted of
6.25-tonne tetrapods from the shoreward end of the breakwater to Profile 4;
8-tonne Core-Locs from Profile 4 to a point between Profiles 6 and 7 (a total
reach of approximately 92 m); and 11-tonne Core-Locs on the remainder of the
seaward trunk, around the head and terminating at the quay wall on the leeward
side of the structure. For this plan, packing densities of the 8- and 11-tonne
Core-Loc reaches were 0.55 and 0.59, respectively. The crest elevation of the
head section was +5 m CD. Plan 1 was subjected to "shakedown" waves
(13 sec, 3 m) to settle and nestle the armor units. During the wave series, apron
material was displaced between Profiles 4 and 9, and Core-Locs were displaced
at the toe near Profile 4 (Photos A4 through A6). The structure was subjected to
3.7-m waves for 13- and 16-sec periods, which caused additional toe unit
displacement at Profile 4 and at the elbow near Profile 8.
Plan 1A
Plan 1A was the same as Plan 1 except a toe buttress was constructed of stone
of identical weight as the underlayer stone (0.75 to 1.8 tonne) and placed
between Profile 4 and the terminus of the quay wall near Profile 10 (Photos A7
through A9). The buttress was placed two stones high and three stones wide
14
Chapter 3 Results
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