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Browsing by Subject 24.5 hour moving window

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  • Inferring inlet morphodynamics and hydraulic parameters from tidal records: A case study of four closure events of Avoca Lake, Australia

    • Authors: Vu, Thi Thu Thuy;  Advisor: -;  Participants: Nielsen, P.; Callaghan, D.P. (2013)

  • The present paper applies a 24.5 hour moving window to analyse tidal records for Avoca Lake, Australia, to infer the morphodynamic time scales as well as tidal response functions for four closure events. This paper includes modifications to the method presented in Thuy et al. (2012) with de-trending before harmonic analysis, resulting in improved results. Compared with Hinwood & McLean’s 14day window, the 24.5 hour moving window ensures reasonable accuracy of results, clearly showing the variation under short rapid change of weather such as storms or floods and less distraction from too many components. The analysis shows that the inlet closing process tends to begin during the neap ...
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  • Inlet morpho-dynamics during a storm event inferred from tidal records: A case study of the Brunswick River, NSW, Australia

    • Authors: Vu, Thi Thu Thuy;  Advisor: -;  Participants: Nielsen, P.; Callaghan, D.P. (2013)

  • 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 t...
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  • Timescales of inlet morphodynamic forced by tides and waves

    • Authors: Vu, Thi Thu Thuy;  Advisor: -;  Participants: Nielsen, P.; Callaghan, D.P.; Hanslow, D.J. (2014)

  • This paper analyses tidal records using a 24.5 hour moving window approach to find Tmorph and provides relationships between Tmorph and the external forcing from waves and tides for different coastal inlets in New South Wales, Australia. Response to extreme changes in forcing depends strongly on bay/inlet size; from small inlets which open and close several times every year to larger systems where the effect of even the most severe weather events is not- or is barely measurable via changes to the inlets hydraulic performance. Outcome can be used in coastal inlet management without extensive river flow and bathymetry data.