A note on tidal current rotation |
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| Authors: | Email author" target="_blank">Noel?CarbajalEmail author |
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| Institution: | (1) Instituto Potosino de Investigación Científica y Tecnológica, Venustiano Carranza 2425-A, Col. Lomas, San Luis Potosí S.L.P, 78210, Mexico |
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| Abstract: | The rotational form of the vertically averaged equations of motion is applied to derive a formula, linear friction included, which establishes a direct connection between sense of rotation of tidal currents and features of tidal amphidromic systems. Two factors in the formula, called  and  , influence the sense of rotation of tidal currents; the factor involves the frequency of the tidal signal  , the Coriolis parameter f, and the linear friction coefficient r. The sign of the cross-product of the logarithm of sea-surface elevation ( ), and phase ( ) gradients  determines whether the factor favors clockwise or anticlockwise sense of rotation.  is a unit vector and  is the angle between  ln and . The limits || 0, ||0 and 0 lead to a clockwise sense of rotation in the Northern Hemisphere. 0  favors anticlockwise rotation in the Northern Hemisphere. Friction and low frequencies favor an anticlockwise sense of rotation. The theory works well in semi-enclosed regions like the North Sea. Although only linear friction and sea-surface elevation gradients were considered, there are ocean regions where the agreement between theory and observations is also good.Responsible Editor: Hans Burchard |
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| Keywords: | Tides Tidal currents Amphidromic systems Sense of rotation Theory |
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