Abstract
Abstract The applicability of grain-size trend analysis for determining sediment transport pathways was investigated on two macrotidal shorefaces of the southern North Sea and Dover Strait where sediment transport is strongly controlled by well-defined, shore-parallel, tidal currents. Sediment transport directions were defined following the Gao and Collins (Sedimentary Geology, 80, 47–60) method, using surficial sediment samples collected from 0 to 8 m water depths. Grain-size trend analysis produced results in relatively good agreement with the directions of near-bottom currents measured in the vicinity of the sampling sites in some cases, but also yielded more confused patterns of calculated transport vectors in others. The best results were obtained when using discrete sets of samples collected during a distinct half tide–cycle. Comparison of threshold shear velocity for sediment motion with estimates of bed shear velocity obtained from near-bottom current data recorded simultaneously with sediment sam...
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