Abstract

A variety of large bedforms, at two scales (sand waves, dunes), occur within the throat section of-small microtidal-inlet channels. The larger forms, which have an average length of 32 m and height of 1.0 m, remain ebb oriented throughout the tidal month but are only actively modified at large tides. The smaller forms, which may be superimposed on the larger, are partially reworked each tidal cycle but are also predominantly ebb oriented. Tidal-current measurements confirm the dominance of ebb-tidal flow in the inlet throats and indicate that despite the small tidal range (maximum 1.1 m), ebb currents may exceed 1.0 m s−1 with associated shear velocities of 0.14 m s−1.

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