Graduate Thesis Or Dissertation
 

Some aspects of currents in Long Island Sound

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  • Current observations were obtained at three locations forming a cross section along 70°34'W longitude in Long Island Sound. Fifteen days of data were selected from each series so that nearly simultaneous observations were used in the analysis. Elementary statistics were computed for the data prior to performing a least squares tidal current analysis. Eight tidal current constituents were fitted in two cases and nine in the remaining instance. Constituent current ellipses were constructed along with the average ellipses. Using the constituents previously computed, the tidal current was predicted for the period of observations. These values were subtracted from the observed current, generating a residual current series. Spectra were computed for each directional component along with cross spectra between the north and east components and also between corresponding components at each of the three different locations. Coherence square and phase relationships also accompanied the latter. An attempt was also made to correlate wind and the residual current by means of cross spectra. However, lack of sufficient wind data prevented a meaningful analysis. The natural period of oscillation of Long Island Sound was estimated by Defant's method of seiche analysis for a bay. This value was used in the equations for a cooscillating system and a comparison was made between the computed and observed amplitudes of the tide. The mean percent error for numerous locations throughout the Sound was 7.1%. Comparison was also made between the maximum flows computed from the above equations and some observed values. The maximum percent error was 24% in an ebbing direction.
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