Undertow Definition

A sketch of the undertow (below the wave troughs) and the shore-directed wave-induced (above the troughs) in a vertical cross-section across (a part of) the surf zone. Sketch from:; MWS = mean water surface.In, undertow is the under-current that is moving offshore when are approaching the shore.

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An undertow is a strong current of water that is moving below the surface current and in a different direction to it. Definition of undertow. Free online Dictionary including thesaurus, children's and intermediate dictionary by Wordsmyth.

Undertow is a natural and universal feature for almost any large body of water: it is a return flow compensating for the onshore-directed average transport of water by the waves in the zone above the. The undertow's are generally strongest in the, where the water is shallow and the waves are high due to.In popular usage, the word 'undertow' is often misapplied to. An undertow occurs everywhere underneath shore-approaching waves, whereas rip currents are localized narrow offshore currents occurring at certain locations along the coast.

Unlike undertow, rip currents are strong at the surface. Contents.Oceanography An 'undertow' is a steady, offshore-directed compensation flow, which occurs below waves near the shore.

Physically, nearshore, the wave-induced between and is onshore directed. This mass transport is localized in the upper part of the, i.e. To compensate for the amount of water being transported towards the shore, a second-order (i.e. Proportional to the ), offshore-directed mean current takes place in the lower section of the water column. This flow – the undertow – affects the nearshore waves everywhere, unlike rip currents localized at certain positions along the shore.The term undertow is used in scientific coastal oceanography papers. The distribution of in the undertow over the water column is important as it strongly influences the on- or offshore. Outside the surf zone there is a onshore-directed sediment transport induced by and skewed-asymmetric wave transport.

In the surf zone, strong undertow generates a near-bed offshore sediment transport. These antagonistic flows may lead to formation where the flows converge near the point, or in the wave breaking zone. Main article:In contrast to undertow, rip currents are responsible for the great majority of drownings close to beaches. When a swimmer enters a rip current, it starts to carry them offshore. The swimmer can exit the rip current by swimming at right angles to the flow, parallel to the shore, or by simply treading water or floating. However, drowning may occur when swimmers exhaust themselves by trying unsuccessfully to swim directly against the flow.On the website it is noted that some uses of the word 'undertow' are incorrect:A rip current is a horizontal current. Rip currents do not pull people under the water–-they pull people away from shore.

Drowning deaths occur when people pulled offshore are unable to keep themselves afloat and swim to shore. This may be due to any combination of fear, panic, exhaustion, or lack of swimming skills.In some regions rip currents are referred to by other, incorrect terms such as 'rip tides' and 'undertow'. We encourage exclusive use of the correct term – rip currents. Use of other terms may confuse people and negatively impact public education efforts. See also.

– A current parallel to the shoreline caused by waves approaching at an angle to the shorelineReferences Notes. Svendsen, I.A. (1984), 'Mass flux and undertow in a surf zone', Coastal Engineering, 8 (4): 347–365,:. ^, from the original on 2014-01-02, retrieved 2014-01-02. Lentz, S.J.; Fewings, M.; Howd, P.; Fredericks, J.; Hathaway, K. (2008), 'Observations and a Model of Undertow over the Inner Continental Shelf', Journal of Physical Oceanography, 38 (11): 2341–2357,:,:,:.

^ Garcez Faria, A.F.; Thornton, E.B.; Lippman, T.C.; Stanton, T.P. (2000), 'Undertow over a barred beach', Journal of Geophysical Research, 105 (C7): 16, 999–17, 010,:,:. ^ Haines, J.W.; Sallenger Jr., A.H.

(1994), 'Vertical structure of mean cross-shore currents across a barred surf zone', Journal of Geophysical Research, 99 (C7): 14, 223–14, 242,:,:. ^ Reniers, A.J.H.M.; Thornton, E.B.; Stanton, T.P.; Roelvink, J.A.

(2004), 'Vertical flow structure during Sandy Duck: Observations and modeling', Coastal Engineering, 51 (3): 237–260,:. (1983), 'Wave set-up, percolation and undertow in the surf zone', Proceedings of the Royal Society of London A, 390 (1799): 283–291,:,:. (1924), Bologna: N. Zanichelli, from the original on 2015-06-15. (1975), 'Integral properties of periodic gravity waves of finite amplitude', Proceedings of the Royal Society of London A, 342 (1629): 157–174,:,:.; Stive, M.J.F.

Aquanox spa at the trump international beach resort. (1985), Journal of Geophysical Research, 90 (C5): 9159–9167,:,:Other.

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un·der·tow

(ŭn′dər-tō′)n.

1. An underwater current flowing strongly away from shore, usually caused by the seaward return of water from waves that have broken against the shore.

2. A tendency, especially in thought or feeling, contrary to what seems the strongest: 'As she talks nostalgically of her days of glory .. a poignant undertow emerges'(Tina Brown).

undertow

(ˈʌndəˌtəʊ) n

1. (Physical Geography) the seaward undercurrent following the breaking of a wave on the beach

2. (Physical Geography) any strong undercurrent flowing in a different direction from the surface current

un•der•tow

(ˈʌn dərˌtoʊ)
n.

1. the seaward, subsurface flow of water from waves breaking on a beach.

2. any strong subsurface current, moving in a direction different from that of the surface current.

un·der·tow

(ŭn′dər-tō′)

An underwater current flowing strongly away from shore. Undertows are generally caused by the seaward return of water from waves that have broken against the shore.

Noun	1.	undertow - an inclination contrary to the strongest or prevailing feeling; 'his account had a poignant undertow of regret' inclination - that toward which you are inclined to feel a liking; 'her inclination is for classical music'
2.	undertow - the seaward undercurrent created after waves have broken on the shore sea purse, sea puss, sea-poose, sea-purse, sea-puss undertide, undercurrent - a current below the surface of a fluid

undertow

[ˈʌndəˌtəʊ]n (of wave) → correntef di risacca; (undercurrent) → risucchio
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Undertow Definition