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Stability Study of the 1978 Jetty Rehabilitation, Yaquina Bay, Oregon, in Response to 1979-1980 Storm Season Waves
The north jetty at Yaquina Bay, Oregon, has been plagued with a history of unusually rapid deterioration when compared with similar North Pacific jetties built with the same design criteria and construction techniques. Since authorization of the jetty system in 1880, the north jetty has undergone extension or rehabilitation a total of seven times, the most recent in 1988. A workshop held in 1989 selected five damage hypotheses, including (a) wave breaking on the jetty, (b) wave-current interaction due to the presence of the offshore reef, (c) scour leading to armor unit slumping, (d) foundation failure, and (e) some combination of the above. One of the recommendations of the workshop was to evaluate the first hypothesis using a physical model of the jetty system on a fixed foundation in an attempt to recreate damage to the north jetty that occurred following the 1979-1980 storm season. The physical model was constructed according to available as-built drawings and bathymetry. A total of 13 storms in the time period October to December were hindcast, simulated, and tested for 6-hr durations at high and low water levels appropriate for the diurnal tide using the directional spectral wave generator. Except for isolated rocking and displacement of random stones, the north jetty remained stable and intact. Thus, based on the this limited series of tests, it must be concluded that wave action alone was probably not responsible for the damage caused to the north jetty.
Stability Study of the 1978 Jetty Rehabilitation, Yaquina Bay, Oregon, in Response to 1979-1980 Storm Season Waves
The north jetty at Yaquina Bay, Oregon, has been plagued with a history of unusually rapid deterioration when compared with similar North Pacific jetties built with the same design criteria and construction techniques. Since authorization of the jetty system in 1880, the north jetty has undergone extension or rehabilitation a total of seven times, the most recent in 1988. A workshop held in 1989 selected five damage hypotheses, including (a) wave breaking on the jetty, (b) wave-current interaction due to the presence of the offshore reef, (c) scour leading to armor unit slumping, (d) foundation failure, and (e) some combination of the above. One of the recommendations of the workshop was to evaluate the first hypothesis using a physical model of the jetty system on a fixed foundation in an attempt to recreate damage to the north jetty that occurred following the 1979-1980 storm season. The physical model was constructed according to available as-built drawings and bathymetry. A total of 13 storms in the time period October to December were hindcast, simulated, and tested for 6-hr durations at high and low water levels appropriate for the diurnal tide using the directional spectral wave generator. Except for isolated rocking and displacement of random stones, the north jetty remained stable and intact. Thus, based on the this limited series of tests, it must be concluded that wave action alone was probably not responsible for the damage caused to the north jetty.
Stability Study of the 1978 Jetty Rehabilitation, Yaquina Bay, Oregon, in Response to 1979-1980 Storm Season Waves
R. D. Carver (author) / M. J. Briggs (author)
1994
123 pages
Report
No indication
English
Dynamic Oceanography , Ocean Sciences & Technology , Civil Engineering , Breakwaters , Coastal regions , Water erosion , Storms , Bathymetry , Bays , Construction , Damage , Design criteria , Deterioration , Failure , Generators , History , Hypotheses , Interactions , Army Corps of Engineers , Models , Offshore , Oregon , Reefs , Rehabilitation , Seasons , Test and evaluation , Tides , Workshops , Jetties
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