Question 1992Navigation General

70% to pass

In some parts of the world there is often a slight fall in tide during the middle of the high water period. The effect is to create a longer period of stand at higher water. This special feature is called a(n) _______________.

A perigean tide
B apogean tide
C bore
D double high water
AI Explanation

The correct answer is D) double high water. The phenomenon of a slight fall in tide during the middle of the high water period, resulting in a longer period of stand at higher water, is known as a double high water. This occurs due to the interaction of the tidal forces of the sun and moon, which can create two distinct high water periods within a single tidal cycle. The other options are incorrect because: A) Perigean tide refers to the higher than normal high tides that occur when the moon is closest to the Earth. B) Apogean tide refers to the lower than normal high tides that occur when the moon is farthest from the Earth. C) A bore is a sudden, powerful rush of water that can occur in some estuaries and rivers with large tidal ranges.

Ready to test your knowledge?

Take a Navigation General Practice Exam

Want to practice with timed exams?

Download Coast Guard Exams for the full exam experience.

Get the App