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Investigating the Adjustment Methods of Monthly Variability in Tidal Current Harmonic Constants
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  • Journal title : Ocean and Polar Research
  • Volume 33, Issue 3,  2011, pp.309-319
  • Publisher : Korea Institute of Ocean Science & Technology
  • DOI : 10.4217/OPR.2011.33.3.309
 Title & Authors
Investigating the Adjustment Methods of Monthly Variability in Tidal Current Harmonic Constants
Byun, Do-Seong;
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This is a preliminary study of the feasibility of obtaining reliable tidal current harmonic constants, using one month of current observations, to verify the accuracy of a tidal model. An inference method is commonly used to separate out the tidal harmonic constituents when the available data spans less than a synodic period. In contrast to tidal constituents, studies of the separation of tidal-current harmonics are rare, basically due to a dearth of the long-term observation data needed for such experiments. We conducted concurrent and monthly harmonic analyses for tidal current velocities and heights, using 2 years (2006 and 2007) of current and sea-level records obtained from the Tidal Current Signal Station located in the narrow waterway in front of Incheon Lock, Korea. Firstly, the l-year harmonic analyses showed that, with the exception of and semidiurnal constituents, the major constituents were different for the tidal currents and heights. , for instance, was found to be the 4th major tidal constituent but not an important tidal current constituent. Secondly, we examined monthly variation in the amplitudes and phase-lags of the and current-velocity and tide constituents over a 23-month period. The resultant patterns of variation in the amplitudes and phase-lags of the tidal currents and tides were similar, exhibiting a sine curve form with a 6-month period. Similarly, variation in the tidal constant and tidal current-velocity phase lags showed a sine curve pattern with a 6-month period. However, that of the tidal current-velocity amplitude showed a somewhat irregular sine curve pattern. Lastly, we investigated and tested the inference methods available for separating the and current-velocity constituents via monthly harmonic analysis. We compared the effects of reduction in monthly variability in tidal harmonic constants of the current-velocity constituent using three different inference methods and that of Schureman (1976). Specifically, to separate out the two constituents ( and ), we used three different inference parameter (i.e. amplitude ratio and phase-lag diggerence) values derived from the 1-year harmonic analyses of current-velocities and tidal heights at (near) the short-term observation station and from tidal potential (TP), together with Schureman`s (1976) inference (SI). Results from these four different methods reveal that TP and SI are satisfactorily applicable where results of long-term harmonic analysis are not available. We also discussed how to further reduce the monthly variability in tidal current-velocity constants.
tidal current harmonic analysis;current observation;inference method;Incheon Lock;
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