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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Abstract

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 (λe/λi), (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 λe/λi < 1. The analysis of such ripples can benefit estimations of paleohydraulic conditions.

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