A brief review of transition processes of wave ripples

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  • ウェーブリップルの遷移過程
  • ウェーブリップル ノ センイ カテイ

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Wave ripples forming under stable oscillatory-flow conditions have a particular set of morphologies, dimensions, and crest orientations. With any significant change in the hydraulic conditions, the wave ripples lose their original equilibrium configuration, take transient forms, and eventually attain a new equilibrium state. This transition process depends on (1) the ratio of the wavelengths of the original ripples to the renewed equilibrium ripples (λei), (2) the degree of asymmetry in oscillatory flow, and (3) sediment grain size when a new oscillatory flow is perpendicular to the crest lines of pre-existing ripples. Distinctive transient ripples, which tentatively appear (and then disappear) during the period of modification, are likely to be preserved in the geological record when λei < 1. The analysis of such ripples can benefit estimations of paleohydraulic conditions.


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