A simple early warning method for large internal solitary waves in the northern South China Sea

Li, Youkai; Wang, Caixia; Liang, Chao; Li, Junde; Liu, Weian

doi:10.1016/j.apor.2016.11.002

Cited by 10 publications

(6 citation statements)

References 28 publications

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“…The propagation speed and direction of internal waves are significant characteristics that can be used to identify possible generation sites. Typically, propagation direction can be determined from wave‐induced velocities in the earth‐coordinate data (e.g., Li et al, ; Mirshak & Kelley, ). In practice, the earth‐coordinate velocity data acquired from the data archive are highly biased by beam separation effects.…”

Section: Resultsmentioning

confidence: 99%

Seasonal Variability and Generation Mechanisms of Nonlinear Internal Waves in the Strait of Georgia

Pawlowicz

Wang

2018

JGR Oceans

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Seasonal variability and generation mechanisms of large nonlinear internal waves are reported, based on an analysis of 9 years of continuous observational data collected at nodes of the Ocean Networks Canada coastal observatory in the Strait of Georgia, Canada. About one thousand large nonlinear internal wave packets were identified. The timing of these packets suggests a very strong correlation with daily tides and fortnightly cycles. More waves are seen during the stronger tides of the fortnightly cycle but overall waves are seen in less than 40% of all days. Other wave characteristics show seasonal variations. In winter, when the pycnocline is weaker, both the spatial and temporal scales of internal waves are several times larger than summertime waves and wave amplitudes can approach 30 m. These waves are large enough vertically but small enough horizontally that standard acoustic Doppler current profiler (ADCP) processing algorithms present a strongly distorted view of wave shape and features. A specialized reprocessing of the beam velocities is used to correctly measure the wave velocity field and to determine wave propagation speed and direction. In addition to the previously known northward‐propagating waves in the Strait, we also found waves propagating in other directions and a noticeable correlation with winds, which may be a proxy for spatial variations in density and/or velocity shear. By considering wave propagation direction, relationship with tidal phase, and relationship with wind, three generation mechanisms were found. Two particularly interesting generation mechanisms involve waves radiating from the Sand Heads area.

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Section: Resultsmentioning

confidence: 99%

Seasonal Variability and Generation Mechanisms of Nonlinear Internal Waves in the Strait of Georgia

Pawlowicz

Wang

2018

JGR Oceans

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“…The design and optimization of hydrokinetic turbines [13,14] and wave power converters [7] should consider these transient changes in the local hydrodynamics generated during low sea states. The generation of transient current accelerations has been identified in internal solitary waves through ADCP (acoustic Doppler current profilers) measurements [15], where kinetic and viscous parameters have been analyzed [16]. The internal solitary waves convey transient accelerations, which vary along the water column and provoke torque and forces over the structures [17,18].…”

Section: Introductionmentioning

confidence: 99%

Hydrokinetic Energy and Transient Accelerations of Marine Currents in Colombian Nearshore Waters

Rueda-Bayona,

Cabello Eras,

Caicedo-Laurido

et al. 2023

Water

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The transient acceleration of ocean currents, or internal waves, is hard to detect, because it does not have climate variability or regular manifestation in the sea. This fluctuation affects not only short-term oceanographic processes but also the hydrokinetic generation of power and the structural health of ocean technologies. Identifying and understanding the mechanisms that generate internal waves require long-term data on the kinetic and viscous–turbulent parameters of the water column measured over long intervals. In this sense, this study analyzed current profiles in nearshore waters (8.9 m depths) measured over six months in the Colombian Caribbean Sea and found internal waves due to the manifestation of transient acceleration propagating in two of the three layers of the water column. The analyzed time series of currents and turbulent kinetic profiles evidenced that transient waves occurred during changes in the surface winds. The applied methodology in this research allowed, for the first time in the study area, the detection of transient accelerations (±0.25 m/s2) that modified the hydrokinetic energy of the water column over short-term periods (6–24 h).

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“…On the one hand, the early warning of the ISWs must ensure timeliness and real-time data. On the other hand, the near-surface current velocity is a major factor affecting the force loads on offshore structures (Li et al, 2016). However, the above two methods are not capable of velocity quantification, and cannot provide good services for engineering applications.…”

Section: Introductionmentioning

confidence: 99%

“…In terms of the prediction of the ISWs, Tian et al (2023) proposed a method for predicting the shear stress induced by shoaling ISWs base on machine learning, and provide reference for reducing damage to the seabed caused by the ISWs. In terms of the real-time warning of the ISWs, only a few research studies (Yuan et al, 2013;Li et al, 2016) on the operational forecast of the ISWs in the SCS were conducted. By providing the mooring with the satellite instant communication system, the mooring data and the parameters of the ISWs can be obtained in real-time.…”

Section: Introductionmentioning

confidence: 99%

An automatic identification algorithm of internal solitary wave for mooring data based on geometric characteristics of the flow field

2023

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Internal solitary wave (ISW) is one of the most important sub-mesoscale phenomenas in the ocean, and detection of which is of utmost significance for marine exploitation, ecological environment protection and military affairs. Therefore, in this study, an automatic algorithm for the identification of ISWs was proposed based on the geometric characteristics of the flow field. The algorithm was applied to calculate the characteristic parameters of the ISWs and its reliability was further verified, indicating that the algorithm can effectively detect the ISWs and provide a reference for preventing and avoiding ISWs in ocean engineering.

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A simple early warning method for large internal solitary waves in the northern South China Sea

Cited by 10 publications

References 28 publications

Seasonal Variability and Generation Mechanisms of Nonlinear Internal Waves in the Strait of Georgia

Seasonal Variability and Generation Mechanisms of Nonlinear Internal Waves in the Strait of Georgia

Hydrokinetic Energy and Transient Accelerations of Marine Currents in Colombian Nearshore Waters

An automatic identification algorithm of internal solitary wave for mooring data based on geometric characteristics of the flow field

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