Total stones removed per 30 m over 25 years
25
20
18
16
20
14
12
10
8
6
15
4
2
10
5
2
4
6
8
10
Hs [m]
Figure A18. Expected damage levels over a 25-year period
The experimental program also examined interactions between the rock-
armored structure and the sand seabed. Partial infilling of the voids of the
sediment-controled spur was allowed to occur during some of the testing. This
was not seen to adversely affect structure stability. Wave transmission
measurements were also made during the test program, and these are included in
Davies (2001).
References
Ahrens, J. P. (1987). "Characteristics of reef breakwaters," Technical Report
CERC-87-17, Coastal Engineering Research Center, U.S. Army Engineer
Waterways Experiment Station, Vicksburg, MS.
Ahrens, J. P. (1989). "Stability of reef breakwaters," Journal of Waterway, Port,
Coastal, and Ocean Engineering 115(2), ASCE.
Battjes, J. A. (1974). "Surf similarity," Proceedings 14th Coastal Engineering
Conference, ASCE, 466-479.
Coastal Data Information Program. (2000). "Grays Harbor Washington Buoy,
Station No. 03601," CDIP Web page http://cdip.ucsd.edu/.
A24
Appendix A
Stability Analysis of a Submerged Spur, North Jetty, Grays Harbor, WA
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