Bedload and wave thrust computations of alongshore sand transport

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Abstract
First‐order approximations permit an analytical integration of alongshore bedload transport by waves within the littoral zone. This analysis treats shallow‐water linear waves with refraction and reflection along an idealized slope, and the equation giving alongshore bedload rate is fairly consistent with the alongshore sediment transport rate due to wave thrust. By importance, there are dependences on wave height, angle, and frequency; sediment characteristics and nearshore slope also occur in the bedload result. Among available laboratory measurements of total alongshore sand transport, 57 tests from 7 studies have satisfactory situation and documentation for evaluation of the bedload analysis. These data are correlated somewhat better by the wave thrust than by the bedload computations, but there is an unexplained dependence of transport rate on surf character. Both this effect and the bedloadlike dependences of the wave thrust result appear important to prediction of extreme alongshore transport rates.

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