An Idealized Model of Meandering Tidal River
Study on tidal river provides understanding to the dynamic interactions between river discharge, tidal fluctuation and other physical processes in the estuarine environment. However, the generalized approach is typically limited to a straight channel in one-dimension, although varying depth and bed profile may be included. The geometry of lowland meander, meanwhile, contains critical lateral component which is not taken into consideration in such simplification. Idealized representation of meander geometry is non-trivial. Harmonic analysis using Fourier Series model requires no less than 20 constituents to reproduce river plan form realistically. On the other hand, sine-generated curve from theory of minimum variance, though requires only few parameters, is applicable only to short symmetrical meandering reach. In this paper, we introduce a reference axis described by a polynomial function of appropriate power, combined with the sine-generated curve to produce good simplified planform approximation of meandering lowland reaches. The number of parameters requires is less and can more readily be interpreted in physical sense. The approach produces an idealized two-dimensional (2D) model of tidal river, which can be applied across a wide range of estuary-river system.
KeywordsEstuary-river system Idealized 2D-model River meander Sine-Generated curve Tidal river
The authors gratefully acknowledge the support provided by the Ministry of Higher Education Malaysia (FRGS/1/2012/TK03/UITM/03/6), and Research Management Institute (RMI) of Universiti Teknologi MARA.
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