In the surf zone, strong undertow generates a near-bed offshore sediment transport.
These antagonistic flows may lead to sand bar formation where the flows converge near the wave breaking point, or in the wave breaking zone. An exact relation for the mass flux of a nonlinear periodic wave on an inviscid fluid layer was established by Levi-Civita in Similarly, Longuet Higgins showed in that — for the common situation of zero mass flux towards the shore i. Stokes' second definition of wave celerity — normal-incident periodic waves produce a depth- and time-averaged undertow velocity: The distribution of the undertow velocity over the water depth is a topic of ongoing research.
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 United States Lifesaving Association 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'.
I fell in love with Lyric instantly. Lyric's dad is a police officer so he's pretty much watching out for her and Bex as much as possible. Fathom is quite a scary character and I loved how he just didn't understand some of the books Lyric brought to him. Michael does a fantastic job by not leaning to any side. You hear a book involved merpeople and most people would be put off by that premise and I admit I might have been one of them, but I gave it a chance and I'm so glad I did. There were elderly creatures, babies, teenagers, and families, all climbing onto the beach, eyeing us with wide-eyed wonder. And then there was the boy.
We encourage exclusive use of the correct term — rip currents. Use of other terms may confuse people and negatively impact public education efforts.
From Wikipedia, the free encyclopedia. Return flow below nearshore water waves.
This article is about undertow beneath water waves. For other uses, see Undertow disambiguation. This article is about an offshore current under all near-shore waves.
It is not to be confused with Rip current. Below the wave trough , the mean velocities are directed offshore. The beach slope is 1: Observations and modeling", Coastal Engineering , 51 3: Accretion Coastal management Integrated coastal zone management Submersion. Test your visual vocabulary with our question challenge! Build a city of skyscrapers—one synonym at a time. Examples of undertow in a Sentence Don't get caught in the undertow.
Recent Examples on the Web An unidentified year-old woman died Sunday near Half Moon Bay after attempting to save three kids reportedly swept out to sea by an undertow. Unexpected turn to his season-themed books," 4 June First Known Use of undertow , in the meaning defined at sense 1.
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Explore the year a word first appeared. Dictionary Entries near undertow undertime undertint undertone undertow undertread undertreat undertrick. Time Traveler for undertow The first known use of undertow was in See more words from the same year.
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Translation of undertow Nglish: Translation of undertow for Spanish Speakers Britannica. Comments on undertow What made you want to look up undertow? Get Word of the Day daily email! Need even more definitions? Ghost Word The story of an imaginary word that managed to sneak past our editors and enter the dictionary.