Undertow (water waves) | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-26

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Undertow_(water_waves)


00:00:53 1 Oceanography
00:02:28 1.1 Seaward mass flux
00:08:44 2 Confusion with rip currents
00:10:15 3 See also



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SUMMARY
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In physical oceanography, undertow is the under-current 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. Unlike undertow, rip currents are strong at the surface.