A nearshore long-term infragravity wave analysis for open harbours

Diaz-Hernandez, Gabriel; Méndez, Fernando J.; Losada, Íñigo J.; Camus, Paula; Medina, Raúl

doi:10.1016/j.coastaleng.2014.12.009

Cited by 21 publications

(10 citation statements)

References 38 publications

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“…This phenomenon is known as harbor oscillation (resonance), which has caught the attention of many researchers for several decades [3]. Significant harbor oscillations can be induced by a variety of dynamic forcings, including short wave groups, infragravity waves, atmospheric fluctuations, tsunamis and shear flow traveling into bays or harbors [4][5][6][7][8][9][10][11][12][13][14]. By creating unacceptable vessel movements, harbor oscillations may interrupt cargo handling, disturb operational efficiency and generate excessive mooring forcing that may break mooring lines [15,16].…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of transient harbor oscillations induced by N-waves

Gao

Gaidai

et al. 2017

Coastal Engineering

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Tsunamis are traveling waves characterized by large amplitudes and long wavelengths close to the coastline. Often, the first couple of leading waves are either leading-elevation N-waves (LEN waves) or leading-depression N-waves (LDN waves). These waves are usually devastating, causing serious damage to coastal infrastructures or even human casualties. Among various natural disasters related to tsunamis, harbor oscillations are one of the most frequent disasters around the world, which can cause excessive movements of moored ships and rupture mooring lines inside the harbor. In this article, transient harbor oscillations induced by various incident N-waves are first investigated. The transient oscillations are simulated by a fully nonlinear Boussinesq model, FUNWAVE-TVD. The incident N-waves include the TS-type and MS-type isosceles LEN and LDN waves. The TS-and MS-type N-waves correspond to the waveform expressions proposed by Tadepalli and Synolakis [1] and Madsen and Schä ffer [2], respectively. This paper focuses on the effects of the incident wave amplitude and its type on the relative wave energy distribution inside the harbor. The maximum runup and rundown of various incident waves are also discussed. For comparison, the transient oscillations excited by solitary waves are also considered. The harbor 

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Section: Introductionmentioning

confidence: 99%

Numerical investigation of transient harbor oscillations induced by N-waves

Gao

Gaidai

et al. 2017

Coastal Engineering

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“…Initial spectral characteristics are: significant wave height of H s = 3.49 m, peak period T p = 13.75 s, mean period T z = 7.49 s and mean propagation direction (in nautical) θ = 236˝. After applying Equations (1) and (2), the obtained long wave height and mean period are: H LW = 0.26 m and T LW = 43 s. This methodology was applied in for the infragravity and resonance wave hindcast in some ports in the north of Spain, obtaining good H LW and T LW predictions [12].…”

Section: Bound Long Wave Predictionmentioning

confidence: 99%

Extended Long Wave Hindcast inside Port Solutions to Minimize Resonance

Diaz-Hernandez

Lara

Losada

2016

JMSE

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The present study shows a methodology to carry out a comprehensive study of port agitation and resonance analysis in Geraldton Harbor (Western Australia). The methodology described and applied here extends the short and long wave hindcast outside the harbor and towards the main basin. To perform such an analysis, and as the first stage of the methodology, it is necessary to determine, in detail, both the long and short wave characteristics, through a comprehensive methodology to obtain and to hindcast the full spectral data (short waves + long waves, for frequencies between 0.005 and 1 Hz). Twelve-year spectral hindcast wave data, at a location before the reef, have been modified analytically to include the energy input associated with infragravity waves. A decomposition technique based on the energy balance of the radiation stress of short waves is followed. Predictions for long wave heights and periods at different harbor locations are predicted and validated with data recorded during 2004 to 2009. This new database will ensure an accurate and reliable assessment of long wave hourly data (height, period and currents) in any area within the main basin of the Port of Geraldton, for its present geometry. With this information, two main task will be completed: (1) undertake a forensic diagnosis of the present response of the harbor, identifying those forcing characteristics related to inoperability events; and (2) propose any layout solutions to minimize, change, dissipate/fade/vanish or positively modify the effects of long waves in the harbor, proposing different harbor geometry modifications. The goal is to identify all possible combinations of solutions that would minimize the current inoperability in the harbor. Different pre-designs are assessed in this preliminary study in order to exemplify the potential of the methodology.

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“…For example, as mentioned in Section 2.3, infra-gravitational waves can affect the operability of large vessels even when they are associated with a low wave high. Similarly, the combination of wind load and wave agitation can cause downtimes when acting together with lower values than when they are acting alone (Díaz-Hernández et al, 2015 [55]).…”

Section: N-dimensional Thresholdingmentioning

confidence: 99%

Assessing Operability on Berthed Ships. Common Approaches, Present and Future Lines

Molina

Campos

Alfonso

et al. 2020

JMSE

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The revenue of a ship company, a terminal, a port and even the whole logistic chain largely depends on the performance of (un)loading operations inside port areas. However, they are conditioned by met-ocean agents that exert stresses on fixed structures, berthed ships and mooring systems that can affect the comfort, productivity and safety of the operations. Under extreme conditions, operations may be interrupted, producing periods of inactivity, economic losses and even jeopardizing the terminal’s reliability. Therefore, it is crucial to develop strategies for characterizing and predicting operability in docks and anchorages. The present paper aims to assess the main approaches up to date to address the operability on berthed ships and to explore present and future strategies. To accomplish this, main factors affecting the operability are reviewed and different methodologies for the characterization and calculation of operability are detailed, together with some results regarding the perception of vulnerability from the Spanish port community. Rather than aiming for generic mono-parametric thresholds, the results highlight the need for addressing this challenge in a specific way for each dock and anchorage, broadening field monitoring and considering the varied peculiarities and the specific perception and experience of main port’s actors.

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A nearshore long-term infragravity wave analysis for open harbours

Cited by 21 publications

References 38 publications

Numerical investigation of transient harbor oscillations induced by N-waves

Numerical investigation of transient harbor oscillations induced by N-waves

Extended Long Wave Hindcast inside Port Solutions to Minimize Resonance

Assessing Operability on Berthed Ships. Common Approaches, Present and Future Lines

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