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5. Technical Note

Title:	Capabilities in harbor design and monitoring: a case study
Authors:	Coastal Engineering Research Center (U.S.)
Keywords:	Harbor design Barbers Point (Hawaii) Waves Energy Harbor resonance Wave conditions
Publisher:	Coastal Engineering Research Center (U.S.) Engineer Research and Development Center (U.S.)
Series/Report no.:	Coastal engineering technical note ; CETN-I-54.
Description:	Technical note Introduction: As waves travel into harbors from deep water, nonlinear processes transfer energy from the wind wave frequencies to long waves with periods on the order of several minutes. Harbor resonance is the phenomenon which occurs when the resonant periods of a harbor are equal or close to forced or incident wave periods. When the harbor is subject to these resonant periods, the amplitude of oscillations increase until the energy loss balances the energy input from the energy sources. The resonant mode with the longest period is the Helmholtz or pumping mode because the water appears to move up and down in unison throughout the harbor. Shorter period modes are characterized by an increasing number of nodes and antinodes within the harbor. Harbor resonance should be avoided or minimized in harbor planning and operation to reduce adverse effects such as hazardous navigation and mooring of vessels, deterioration of structures, and sediment deposition or erosion within the harbor. Harbor wave response can be estimated from field measurements, numerical models, and physical models. Each of these sources of information has assumptions and limitations which restrict its utility; however, use of numerical and physical models in conjunction with prototype measurements can provide accurate engineering estimates of harbor wave response. In harbor design, or evaluation of proposed design modifications, prototype measurements are used to calibrate both the numerical and physical models and verify the wave response at selected locations within the harbor. The numerical model results are used to determine the test conditions that will be evaluated in the physical model. Incident wave conditions having little effect on the harbor are not tested in the physical model. The models provide an opportunity to test wave conditions which were not measured in the field, but are of interest from a design standpoint. The opportunity to collect data at sites other than field gage locations is made available through modeling efforts. Thus, the use of field measurements, and numerical and physical models provides an excellent example of good coastal engineering practice in the design of harbors.
Rights:	Approved for public release; distribution is unlimited.
URI:	http://hdl.handle.net/11681/2331
Appears in Collections:	Technical Note