As reported by Smith and Chapman (1982), the initial failure was
always triggered by subsidence of the toe units, thus causing the
first armor layer to rattle down the slope (see Figure 2).
As
the freeboard is reduced, waves overtop the revetment and erode
Finally, the wall collapses
the filter material (see Figure 3).
landward into the eroded space (Figure 4) and is buried beneath
the beach profile (Figure 5 ) . The observed failure sequence
occurs in less than 20 minutes for revetments over 5 m (16 ft)
high.
SPRAY EROSION
KEY
TOE
BOULDER
4
SUNK
SUBSIDED
KEY TOP BOULDER 1
SAND
.
.
FINAL COLLAPSE
Figure 4.
AFTER STORM
Figure 5.
2
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