Analysis of tide records from Monterey Harbor for thethree-year period 1964-1966 showed that two types ofsub-tidal oscillations occur in the harbor having meanperiods in the range of 19 to 39 minutes and 1.5 to 2.0minutes. Their heights, recorded on the tide records,varied from 0.2 to 0.4 foot and from 0.1 to 0.5 foot,respectively. The longer waves occur in trains havingdurations from a few hours to several days, and have awell-defined seasonal and diurnal frequency of occurrence,being most common during July and between the hours of1200 and 1600. The shorter waves are recorded almostcontinuously. The long period waves probably areprogressive waves produced by air-pressure fluctuations orby resonance with the ordinary surface waves associatedwith the coastal sea breeze. The short period wavesappear to be either natural oscillations of the harbor orsurf beat accompanying swell arriving from the open ocean.
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