Temporal Variation of Shallow-Water Tides In Basin-Inlet Systems

  1. David G. Aubrey and
  2. Lee Weishar
  1. John D. Boon

Published Online: 23 MAR 2013

DOI: 10.1029/LN029p0125

Hydrodynamics and Sediment Dynamics of Tidal Inlets

Hydrodynamics and Sediment Dynamics of Tidal Inlets

How to Cite

Boon, J. D. (1988) Temporal Variation of Shallow-Water Tides In Basin-Inlet Systems, in Hydrodynamics and Sediment Dynamics of Tidal Inlets (eds D. G. Aubrey and L. Weishar), Springer-Verlag, New York. doi: 10.1029/LN029p0125

Publication History

  1. Published Online: 23 MAR 2013
  2. Published Print: 1 JAN 1988

ISBN Information

Print ISBN: 9783540968887

Online ISBN: 9781118669242

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Keywords:

  • Complex demodulation of tides;
  • Demodulation of predicted tides;
  • Flood and ebb currents;
  • Observed tides;
  • Semi-diurnal and quarter-diumal tides;
  • Shallow-water tides;
  • Temporal variations

Summary

Temporal variations occur in the flood or ebb duration differences of asymmetrical tides in basin-inlet systems. These variations are due largely to the conjunction of a few tidal constituents at adjacent semi-diurnal and quarter-diurnal frequencies rather than timedependent variation in the tidal harmonic constants themselves. Where shallow-water tidal distortions are present, they thus can be modelled by the combination of a semi-diurnal oscillation at the M2 frequency with a quarter-diurnal oscillation at the M4 frequency, given amplitudes and phase angles that reflect time-varying behavior. Indices of tidal asymmetry such as the M4/M2 amplitude ratio vary as a function of time according to this model as revealed by complex demodulation of tidal time series at the M2 and M4 frequencies. The demodulation shows that the amplitude of the quarter-diurnal tide varies approximately as the square of the amplitude of the semi-diurnal tide.