Combined-flow ripple profiles A preliminary note

Abstract

Combined-flow ripples were produced in a recirculating flume with wave-generator at the Osaka University. Waves propagate against the current direction in the flume. The combined-flow ripples in our flume show the characteristic profiles of rounded lee and stoss sides and rounded troughs. The roundness of ripple profiles decreases by the incresing of oscillatory velocity, and the symmetry changes weaker related to the increasing of unidirectional velocity. Ancient combined-flow ripples, which have been recognized as wave ripples, are also introduced from the shallow-marine stratigraphic record.