Inlet morpho-dynamics during a storm event inferred from tidal records: a case study of the Brunswick River, NSW, Australia

Vu, Thuy, T. T., Nielsen, Peter and Callaghan, David P. (2013) Inlet morpho-dynamics during a storm event inferred from tidal records: a case study of the Brunswick River, NSW, Australia. International Journal of Engineering Research, 2 2: 38-43.

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Author Vu, Thuy, T. T.
Nielsen, Peter
Callaghan, David P.
Title Inlet morpho-dynamics during a storm event inferred from tidal records: a case study of the Brunswick River, NSW, Australia
Journal name International Journal of Engineering Research   Check publisher's open access policy
ISSN 2319-6890
Publication date 2013-05-01
Sub-type Article (original research)
Open Access Status File (Publisher version)
Volume 2
Issue 2
Start page 38
End page 43
Total pages 6
Place of publication Bhopal, Madhya Pradesh, India
Publisher Innovative Research Publications
Collection year 2014
Language eng
Formatted 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 Tmorph 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.

Tmorph is inferred from time series of primary semi-diurnal gain G2(t)= |F2| with an exp(-t/Tmorph) 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 Qf 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/Tmorph) after the storm.

Keyword Brunswick Heads
Morphodynamic timescale
24.5 hour moving window
Morphodynamics
Tidal response
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2014 Collection
 
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Created: Wed, 11 Sep 2013, 14:04:12 EST by Julie Hunter on behalf of School of Civil Engineering