Modeling of Harbor Resonance in Port of Long Beach

Briggs, Michael J.; Dykstra, David; Baldwin, Thomas E.

doi:10.1061/40775(182)38

Cited by 4 publications

(1 citation statement)

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“…Harbor seiches can cause excessive vessel movements and compromise harbor operations [Seabergh (1993); Lee et al (1998); Poon et al (1998); Li (2002); Briggs et al (2005); and many others]. In small coastal harbors, seiching is often excited by infragravity waves and more rarely by atmospheric pressure oscillations (Gomis et al 1993;Vidal et al 2000;de Jong and Battjes 2004), tsunamis (Lepelletier 1981;Lepelletier and Raichlen 1987), earthquakes (Ichinose et al 2000), and internal waves (Graham et al 1990).…”

Section: Introductionmentioning

confidence: 99%

Infragravity Seiches in a Small Harbor

Cuomo

Guza

2017

J. Waterway, Port, Coastal, Ocean Eng.

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A method is developed to estimate harbor seiche at Marina di Carrara, Italy, from the properties of wind-generated incident waves outside the harbor. A linear model of the spatial structure of amplified seiche modes is combined with empirical estimates of the response of each mode to variable incident wave forcing. These empirical coefficients parameterize the complex nonlinear transfer of energy from wind waves to lower frequency seiche. As at other small harbors (<1 km 2 surface area) on ocean coasts, and consistent with previous analyses at Carrara, the observed seiche is relatively energetic at several periods between about 1 and 15 min that are highly amplified theoretically, and the spatial structure of modeled and observed seiches agree as well. The longest seiche (%15 min) mode is almost spatially uniform within the harbor and dominates with low-energy, short-period incident wind waves (measured 1 km offshore of the harbor). Increased wave energy and longer periods excite shorter period (1-3 min) seiche modes with more complex spatial structure, including small areas of high amplification, which have led to operational issues. The energy in each of the six most energetic seiche modes is related in this paper empirically to offshore incident wind wave height and peak period, allowing detailed predictions of harbor seiche from routine wind wave forecasts. The approach appears applicable to relatively small, shallow harbors with reflective quay walls, in which the exterior harbor mouth is exposed, and the interior sheltered from energetic wind-generated waves.

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