Informatics Publishing Limited

Thuy T. T. Vu ¹, Peter Nielsen ¹, David P. Callaghan ¹

Affiliations
1 School of Civil Engineering, University of Queensland, Brisbane, QLD-4072, AU

Abstract

A 24.5h moving window is used to analyse storm effects on the tidal dynamics. Compared to earlier studies using window lengths varying between 2h (for tsunami analysis) to 14 days for tidal inlet analysis, the present method provides good resolution of variations of hydraulic efficiency during storms or floods. The importance of de-trending before carrying out the harmonics analysis has been studied and it was found to be highly important. De-trending involved removing the 24.5h mean before harmonic analysis. The main results are the morphodynamic timescale T_morph and the varying response functions F₁ and F₂ of the diurnal and semi-diurnal tidal constituents through a storm event at the Brunswick River, Australia.
T_morph is inferred from time series of primary semi-diurnal gain G₂(t)=|F₂| with an exp (-t/T_morph) curve fit. The results show only insignificant morphological change. Thus, the changes in tidal response for this medium sized catchment are mainly due to hydraulic effects. These include the influence of river flow Q_f via the non-linear friction term and increased estuary surface area during the flood. The traces of both F₁(t) and F₂(t) in the complex plane show an equilibrium before the storm, dynamic change during the storm and relaxation mimicked by exp (-t/T_morph) after the storm.

Keywords

Brunswick Heads, Morphodynamic Timescale, 24.5 Hour Moving Window, Morphodynamics, Tidal Response.

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