GEOMETRY PREDICTION FOR WAVE-GENERATED BEDFORMS

Published data on wave-generated bedform geometry from field and labor atory measurements are re-evaluated in terms of relative fluid orbit d iameter at the bed, and a wave period parameter, X = rhoD/gamma(s)T2. Laboratory bedform data shows a strong dependence on these parameters. However, for very small values of the period parameter (typically fie ld data), there is evidence that bedform length depends only on sedime nt grain size. The disappearance of sediment bedforms at high fluid ve locities, apparently occurs through a decrease in bedform height. Impr oved methods for the prediction of bedform geometry under waves are pr ovided in graphical form and computer code.