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Geological Society, London, Special Publications; 2007; v. 274; p. 45-51;
DOI: 10.1144/GSL.SP.2007.274.01.06
© 2007 Geological Society of London

Simple analytical results for bedload transport due to tides

John N. Aldridge

Centre for Environment, Fisheries, and Aquaculture Science, Pakefield Rd, Lowestoft, Suffolk NR33 0HT, UK (e-mail: j.n.aldridge{at}cefas.co.uk)

Patterns of sediment erosion and deposition arising from tide induced bedload transport are explored using standard bedload formulae and a simple analytic approach. Decomposing the current into a principal M2 tidal constituent, an M4 first harmonic and a tidal residual, it is straightforward to derive an expression for the contribution each makes to the integrated tidal flux. The resulting expressions are applied to calculate the net change in bed level induced by bedload transport due to a superposition of a Kelvin tidal wave, a harmonic overtide and a residual tide.