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  • Sediment transport and morphodynamics of My A inlet, Vietnam, in the low flow season

    • Authors: Nghiem, Tien Lam;  Advisor: -;  Participants: Le, Dinh Thanh; Vu, Minh Cat; Vu, Thi Thu Thuy (2009)

  • Sediment transport and morphodynamics of the My A inlet are simulated and analyzed using Delft3D process-based numerical model. The processes of waves, tides, river flows, sediment transport and bed level changes are taken into account in the simulation model. Based on the simulation results, inlet morphodynamics are analyzed to gain insight into the cause of inlet closure. The main reason of inlet closure is found due to both wave-driven onshore and longshore sediment transports.
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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 the Brunswick River, Australia.
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  • Sand barrier dynamics by waves and currents

    • Authors: Vu, Thi Thu Thuy;  Advisor: -;  Participants: Nielsen, P.; Nghiem, Tien Lam; Kuma, S.J. (2012)

  • Laboratory measurements of sand barrier dynamics are presented in terms of sediment transport or morphology changes through (i) wave only and (ii) combined wave and current cases. The trend in sediment transport direction can be seen clearly for case 1. In contrast, the direction of sediment transport in case 2 is not clear except for the combination of wave and following current Q=25l/s, where the sediment transport direction is in the direction of wave and current. Results show that none of the models are suitable for this experiment, although the Ribberink and Al-Salem (1994) formula gives least error.
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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 tidal phase and takes 1 to 4 days except during rain fall or storm wave events which lengthen the cl...
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