ERDC/CHL CHETN-IX-5
September 2001
St.
Paul
Crescent City
Burns
Cleveland
Harbor
Hum boldt
Manasquan
Allegheny Lock
& Dam
Nawiliwili
Kahului
Laupahoehoe
Ofu,
A. Samoa
Figure 2. Sites monitored through periodic inspections
CURRENT PROJECTS: There are currently eight active projects being monitored in the
MCNP Program. Brief descriptions of these projects are presented in the following
subparagraphs:
Morro Bay Harbor, California. The entrance to Morro Bay was known as one of the most
dangerous in the United States due to steep and breaking wave conditions. Improvements
completed in December 1995 consisted of a deepened, expanded entrance channel and a sand
trap within the harbor entrance structures. Modifications were expected to allow passage of most
large waves through the entrance without breaking, or steepening, and creating hazardous
conditions. Structural modifications at the site lacked economic justification. Prior to
improvements, both numerical and physical model investigations were conducted as well as a
limited field investigation to optimize project design performance.
The objective of the monitoring study is to determine if the nonstructural modifications at the
harbor entrance are performing as predicted. Evaluation of hydrodynamic conditions and
sedimentation rates in the harbor entrance as well as validation of models used as design tools
are being performed. Wave data (both inside and outside the harbor entrance), tidal elevations
and currents, and bathymetric surveys are being obtained to determine design effectiveness of the
harbor entrance alternative. Limited ground surveys and photogrammetric surveys of the
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