期刊名称：International Journal of Engineering Research
印刷版ISSN：2319-6890
出版年度：2013
卷号：2
期号：2
页码：38-43
出版社：IJER
摘要：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 hyd raulic efficiency during storms or floods. The importance of de-trending before carrying out the harmonics analysis has been studied and it was fo und to be highly important. D e-trending involved removing the 24.5h mean before harmonic analysis. The main results are the morphodynamic timescale T morph and the varying response functions F 1 and F 2 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 G 2 (t)= |F 2 | 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 flo w Q f via the non-linear friction term and increased estuary surface area during the flood . The traces of both F 1 (t) and F 2 (t) in the complex plane sho w an equilibrium before the storm, dynamic change during the storm and relaxation mimicked by exp(-t/T morph ) after the storm.
