Some transient aspects of tidal propagation

Details Some transient aspects of tidal propagation Some transient aspects of tidal propagation

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.1215v&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Feb. 1, 1991, p. 1215-1224.

Physics

19

Atmospheric Tides, Planetary Waves, Transient Response, Wave Propagation, Gravity Waves, Time Dependence

Scientific paper

The effects of transient forcing on the structure of some tidal modes are investigated using a time-dependent numerical model. The simulated tidal structures are interpreted as consisting of beats between tidal modes and transient waves near tidal periods. Vertical group velocities are calculated and compared with those computed using the analytical expressions of Richmond (1975). Several possible definitions of the setup time are given, and the results from model calculations are compared with those obtained by Bernard (1981). It is found that the (2, 2) setup time is longer (several weeks) than the (1, 1) setup time, contrary to the Bernard conclusions. Finally, results obtained for a two-dimensional gravity wave are analyzed to clarify further basic mechanisms acting on tidal structure variations induced by transient forcing.

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