What term describes a 'no-tide' point in the ocean caused by basin resonances, friction, and other factors around which tide crests rotate?

What term describes a 'no-tide' point in the ocean caused by basin resonances, friction, and other factors around which tide crests rotate?

• A. Amphidromic Point
• B. Wave Train
• C. Apogee
• D. Wavelength

Answer: (A)

Amphidromic point is the term for a location in the ocean where the tidal range is effectively zero, and around which tide crests rotate. This happens because the tidal signal from the Moon and Sun interacts with the rotation of the Earth and the shape of the basin, so the wave fronts rotate around these points. The result is a system where you see little or no rise and fall at the amphidromic point itself, while farther away the tides build in a rotating pattern as crests move around it. Basin resonances and friction help set the exact position and strength of these points, but the defining idea is a zero-tide point with rotating tidal crests. For contrast, a wavelength is the distance between successive crests, a wave train is a group of waves traveling together, and an apogee is the farthest point in an orbit; none describe a zero-tide point that tides rotate around.

Amphidromic point is the term for a location in the ocean where the tidal range is effectively zero, and around which tide crests rotate. This happens because the tidal signal from the Moon and Sun interacts with the rotation of the Earth and the shape of the basin, so the wave fronts rotate around these points. The result is a system where you see little or no rise and fall at the amphidromic point itself, while farther away the tides build in a rotating pattern as crests move around it. Basin resonances and friction help set the exact position and strength of these points, but the defining idea is a zero-tide point with rotating tidal crests. For contrast, a wavelength is the distance between successive crests, a wave train is a group of waves traveling together, and an apogee is the farthest point in an orbit; none describe a zero-tide point that tides rotate around.