Application of Computer Modeling for Harbor Resonance Studies of Long Beach &amp; Los Angeles Harbor Basins

Lee, Jiin‐Jen; Lai, Ching-Piau; Li, Yigong

doi:10.1061/9780784404119.088

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…Next, the wave components can be linearly combined a posteriori using the values of the input spectra to generate useful quantities of interest, see for instance [1]. One recurrent application consists in looking for those frequencies generating high wave amplifications for random directional incident waves, and use them to identify potential resonance effects in the harbor [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Fast solution of elliptic harbor agitation problems under frequency-direction input spectra by model order reduction and NURBS-enhanced FEM

Modesto

Zlotnik

et al. 2020

Coastal Engineering

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Section: Introductionmentioning

confidence: 99%

Fast solution of elliptic harbor agitation problems under frequency-direction input spectra by model order reduction and NURBS-enhanced FEM

Modesto

Zlotnik

et al. 2020

Coastal Engineering

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“…In practice many publications (e.g. [24][25][26][27][28]) employ the mild slope equation to model wave effects in coastal areas. It was first derived by Berkhoff [29] and can be written as…”

Section: Introductionmentioning

confidence: 99%

Shape optimization of a breakwater

Keuthen

Kraft

2015

Inverse Problems in Science and Engineering

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In this paper, we optimize the shape of a breakwater which protects a harbour basin from incoming waves. More specifically, our objective is reducing the harbour resonance due to long-range ocean waves. We consider the complex-valued Helmholtz equation as our model state equation and minimize the average wave height in the harbour basin with the shape of the breakwater as optimization variable. The geometry is described by the level set method, i.e. the domain is given as the subzero level set of a function. In contrast to many publications we use the volume expression of the shape derivative, which lends itself naturally to a level set update via a transport equation. The model problem features intrinsic geometric constraints which we treat in the form of forbidden regions. We guarantee feasibility of the iterates by projecting the gradient onto a suitable admissible set.

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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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Application of Computer Modeling for Harbor Resonance Studies of Long Beach & Los Angeles Harbor Basins

Cited by 3 publications

References 3 publications

Fast solution of elliptic harbor agitation problems under frequency-direction input spectra by model order reduction and NURBS-enhanced FEM

Fast solution of elliptic harbor agitation problems under frequency-direction input spectra by model order reduction and NURBS-enhanced FEM

Shape optimization of a breakwater

Infragravity Seiches in a Small Harbor

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