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In physical oceanography, undertow is the undercurrent that is moving offshore when waves are approaching the shore. 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 wave troughs. The undertow's flow velocities are generally strongest in the surf zone, where the water is shallow and the waves are high due to shoaling.

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  • In physical oceanography, undertow is the undercurrent that is moving offshore when waves are approaching the shore. 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 wave troughs. The undertow's flow velocities are generally strongest in the surf zone, where the water is shallow and the waves are high due to shoaling. In popular usage, the word "undertow" is often misapplied to rip currents. An undertow occurs everywhere underneath shore-approaching waves, whereas rip currents are localized narrow offshore currents occurring at certain locations along the coast. (en)
  • Odpływ (odpływ zwrotny, odpływ denny) – przepływ wody blisko dna w stronę morza powodowany przez fale transportujące wodę na powierzchni morza w stronę brzegu. Odpływ przy dnie jest związany z dryfem Stokesa w strefie załamywania się fal przy brzegu i jest często mylony z prądami strugowymi. (pl)
  • Ressaca é o movimento anormal das ondas do mar sobre si mesmas na área de rebentação, causada por rápidas e violentas mudanças no tempo. (pt)
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  • Odpływ (odpływ zwrotny, odpływ denny) – przepływ wody blisko dna w stronę morza powodowany przez fale transportujące wodę na powierzchni morza w stronę brzegu. Odpływ przy dnie jest związany z dryfem Stokesa w strefie załamywania się fal przy brzegu i jest często mylony z prądami strugowymi. (pl)
  • Ressaca é o movimento anormal das ondas do mar sobre si mesmas na área de rebentação, causada por rápidas e violentas mudanças no tempo. (pt)
  • In physical oceanography, undertow is the undercurrent that is moving offshore when waves are approaching the shore. 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 wave troughs. The undertow's flow velocities are generally strongest in the surf zone, where the water is shallow and the waves are high due to shoaling. (en)
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  • Odpływ (fale) (pl)
  • Ressaca marítima (pt)
  • Undertow (water waves) (en)
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