Seiches

Wilson, Basil W.

doi:10.1016/b978-0-12-021808-0.50006-1

Cited by 112 publications

(69 citation statements)

References 32 publications

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“…This picture suggests that the reservoir behaves as a forced oscillator. A well-known result in classical mechanics is that the amplitudes of the motions described by a forced harmonic oscillator depend on the energy of the forcing mechanism, the frequency of the forcing compared with the natural frequency of the oscillator, and their relative phase (see, e.g., Wilson 1972). These concepts are applicable to wind-forced basin-scale internal waves (Antenucci et al 2000).…”

Section: Resultsmentioning

confidence: 99%

The seasonal evolution of high vertical‐mode internal waves in a deep reservoir

Vidal

Rueda

Casamitjana

2007

Limnology & Oceanography

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The causal mechanism and seasonal evolution of the internal wave field in a deep, warm, monomictic reservoir are examined through the analysis of field observations and numerical techniques. The study period extends from the onset of thermal stratification in the spring until midsummer in 2005. During this time, wind forcing was periodic, with a period of 24 h (typical of land-sea breezes), and the thermal structure in the lake was characterized by the presence of a shallow surface layer overlying a thick metalimnion, typical of small to medium sized reservoirs with deep outtakes. Basin-scale internal seiches of high vertical mode (ranging from mode V3 to V5) were observed in the metalimnion. The structure of the dominant modes of oscillation changed as stratification evolved on seasonal timescales, but in all cases, their periods were close to that of the local wind forcing (i.e., 24 h), suggesting a resonant response. Nonresonant oscillatory modes of type V1 and V2 became dominant after large frontal events, which disrupted the diurnal periodicity of the wind forcing.

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Section: Resultsmentioning

confidence: 99%

The seasonal evolution of high vertical‐mode internal waves in a deep reservoir

Vidal

Rueda

Casamitjana

2007

Limnology & Oceanography

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“…Nevertheless, significant seiche oscillations (0.5-1 m) have been repeatedly recorded in this region, in particular in the Gulf of Trieste and the Gulf of Venice (Caloi, 1938;Greco et al, 1957;Defant, 1961;Wilson, 1972). The region best known for extreme meteotsunami events is the eastern part of the middle Adriatic where there are a number of islands, channels and funnel-shaped bays and harbours.…”

Section: Adriatic Seamentioning

confidence: 99%

“…Wilson, 1972;Miles, 1974 Fine et al, 2005), while atmospherically generated tsunami-like waves can attain potentially dangerous levels only if there is some local or regional topographic resonance. This is an important difference between tsunami waves and meteotsunamis.…”

Section: Atmospherically Generated Long Waves In the Tsunami Frequencmentioning

confidence: 99%

Meteotsunamis: atmospherically induced destructive ocean waves in the tsunami frequency band

Monserrat

Vilibić

Rabinovich

2006

Nat. Hazards Earth Syst. Sci.

416

393

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Abstract. In light of the recent enhanced activity in the study of tsunami waves and their source mechanisms, we consider tsunami-like waves that are induced by atmospheric processes rather than by seismic sources. These waves are mainly associated with atmospheric gravity waves, pressure jumps, frontal passages, squalls and other types of atmospheric disturbances, which normally generate barotropic ocean waves in the open ocean and amplify them near the coast through specific resonance mechanisms (Proudman, Greenspan, shelf, harbour). The main purpose of the present study is to describe this hazardous phenomenon, to show similarities and differences between seismic and meteorological tsunamis and to provide an overview of meteorological tsunamis in the World Ocean. It is shown that tsunamis and meteotsunamis have the same periods, same spatial scales, similar physical properties and affect the coast in a comparably destructive way. Some specific features of meteotsunamis make them akin to landslide-generated tsunamis. The generation efficiency of both phenomena depend on the Froude number (Fr), with resonance taking place when Fr∼1.0. Meteotsunamis are much less energetic than seismic tsunamis and that is why they are always local, while seismic tsunamis can have globally destructive effects. Destructive meteotsunamis are always the result of a combination of several resonant factors; the low probability of such a combination is the main reason why major meteotsunamis are infrequent and observed only at some specific locations in the ocean.

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“…Seiches with various different modes can occur together in a system. However, the fundamental oscillation is usually dominant, as first shown by Wilson [56].…”

Section: Eigen Analysismentioning

confidence: 99%

Low Frequency Waves Detected in a Large Wave Flume under Irregular Waves with Different Grouping Factor and Combination of Regular Waves

Riefolo

Contestabile

Dentale

et al. 2018

Water

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This paper describes a set of experiments undertaken at Universitat Politècnica de Catalunya in the large wave flume of the Maritime Engineering Laboratory. The purpose of this study is to highlight the effects of wave grouping and long-wave short-wave combinations regimes on low frequency generations. An eigen-value decomposition has been performed to discriminate low frequencies. In particular, measured eigen modes, determined through the spectral analysis, have been compared with calculated modes by means of eigen analysis. The low frequencies detection appears to confirm the dependence on groupiness of the modal amplitudes generated in the wave flume. Some evidence of the influence of low frequency waves on runup and transport patterns are shown. In particular, the generation and evolution of secondary bedforms are consistent with energy transferred between the standing wave modes.

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Seiches

Cited by 112 publications

References 32 publications

The seasonal evolution of high vertical‐mode internal waves in a deep reservoir

The seasonal evolution of high vertical‐mode internal waves in a deep reservoir

Meteotsunamis: atmospherically induced destructive ocean waves in the tsunami frequency band

Low Frequency Waves Detected in a Large Wave Flume under Irregular Waves with Different Grouping Factor and Combination of Regular Waves

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