Accession Number:

ADA200354

Title:

Jetty Rehabilitation Stability Study Yaquina Bay, Oregon

Descriptive Note:

Final rept. Oct 1987-Jan 1988

Corporate Author:

COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS

Personal Author(s):

Report Date:

1988-09-01

Pagination or Media Count:

128.0

Abstract:

A three-dimensional, physical, hydraulic model investigation was performed to establish a stable jetty design for use in the proposed rehabilitation of the north jetty at Yaquina Bay, Oregon. The study was conducted at a geometrically undistorted linear scale of 145, model to prototype. Undirectional, spectral test waves were generated from three directions. Wave conditions were selected based on six hindcasted storms which covered the range of historical and probable worst wave conditions. Tests were conducted at still-water levels of 0.0 ft and 10.0 ft mean lower low water. The seaward end of the north jetty has undergone rapid deterioration since the previous 1977-1978 rehabilitation. The loss of approximately 400 ft of the jetty has resulted in increased deposition of littoral material in the entrance channel and more severe wave conditions at the mouth. Three mean amorstone weights 16, 23, and 29 tons were used in the rehabilitation plan tested. This plan would restore the jetty to its original length and would utilize the placed-stone construction technique. The model tests indicated that the recommended armor-stone weights were adequate and that the plan to employ placed-stone construction of the jetty on existing deteriorated jetty stone was acceptable. Additional tests were performed with monochromatic wave conditions in an effort to compare wave heights measured in the physical model with wave heights predicted in an earlier study by the numerical model, RCPWAVE. A discussion of those test results is included. FR

Subject Categories:

  • Physical and Dynamic Oceanography
  • Civil Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE