Abstract
High resolution acoustic images are presented of bedform development on the crest of a nearshore bar during a storm. The images were obtained using a 2.25 MHz rotating sidescan sonar. The sonar system provides a continuous record of the evolution of the bedform field through time, within a 10-m diameter field of view. The images document the occurrence of ripples, cross ripples, and megaripples. During the waning stages of the storm, transitions among ripple types occurred on time scales of 1–3 h, beginning with flat bed and culminating in highly 3-D short-crested ripples.
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