Undertow: There is spirited discussion and disagreement among coastal scientists on the existence of a nearshore process called "undertow," and hence there is not an agreed on definition for this word. Undertow is a term often and incorrectly used for rip currents. The best explanation for what many people attribute to "undertow" is as follows: After a wave breaks and runs up the beach, most of the water flows seaward; this "backwash" of water can trip waders, move them seaward, and make them susceptible to immersion from the next incoming wave; however, there is no surf zone force that pulls people under the water.I wish it were mandatory for everyone who goes to the beach to learn about rip currents before going into the water. I grew up along the Jersey Shore, and it was clear that rip currents are probably the most frequent contributor to drowning incidents, and that knowledge about rip current action could prevent most of those drownings. And yet it's not something widely understood. I have made it a personal mission to explain this and draw diagrams in the sand for people when I know they're not that familiar with ocean swimming. About ten years ago I was at a beach house with some friends, all of whom were also lifeguards and swim teachers at the same summer camp, and who taught about riptides. Despite their "head knowledge" about what a riptide was, and their comfort in the water, they didn't have all that much experience on the ocean beach, and two of them were caught in a really powerful rip current. It exhausted them both as they tried to swim against the current, got more and more panicked, and felt their arms and legs tiring out. It was pretty dangerous for a while. They both made it back to shore, but both were very seriously scared by the experience, enough that one guy was not interested in going back into the water all week. Even though they understood what a riptide was, it took a long time for them to realize they were caught in one and to react by swimming at an angle out of the current.
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posted by phunniemee at 9:12 PM on July 6, 2010 [4 favorites]