2008年12月11日 星期四

rip current, breakwater

Wikipedia article "Breakwater (structure)".

Breakwaters are structures constructed on coasts as part of coastal defence or to protect an anchorage from the effects of weather and longshore drift.

ぼうはてい 防波堤

a breakwater.

離岸流 - Wikipedia

日文:「 離岸流 」(りがんりゅう).

中文:離岸流;裂流;激流

http://en.wikipedia.org/wiki/Rip_current

A rip current is a strong flow of water returning seaward from the shore. It is often mistakenly called a "rip tide" or "riptide", though the occurrence is not related to the tides. Colloquially a rip current is known simply as a rip. Although rip currents would exist even without the tides, tides can make an existing rip much more dangerous (especially low tide). Typical flow is at 0.5 meters per second (1-2 feet per second), and can be as fast as 2.5 meters per second (8 feet per second). Rip currents can move to different locations on a beach break, up to a few hundred feet a day. They can occur at any beach with breaking waves, including the world's oceans, seas, and large lakes such as the Great Lakes in Canada and the United States.

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