Rapid Gravity Flow Transformation Revealed in a Single Climbing Ripple

Jaco H. Baas, Jim Best, Jeff Peakall

Research output: Contribution to journalArticlepeer-review


Sediment gravity flows demonstrate a wide range of rheological behaviors, and past work has shown how transformations between flow types generate spatiotemporal changes in the resultant sedimentary successions. We used the geometrical characteristics of a single climbing ripple to demonstrate how such flows can transform from a turbulent to a quasi-laminar plug flow, with the transitional clay flow sequence being manifested by abnormally large heterolithic sand-clay current ripples with small backflow ripples, and then abundant clay deposition associated with smaller ripples. Analysis of ripple size, angle of climb, grain size, internal erosional surfaces, and soft-sediment deformation suggests that transformation in the rheological character of the sediment gravity flow was rapid, occurring over a period of tens of minutes, and thus probably over a spatial scale of hundreds of meters to several kilometers. Our study indicates how the character of flow transformation can be elucidated from the details of a small-scale sedimentary structure.

Original languageEnglish (US)
Pages (from-to)493-497
Number of pages5
Issue number5
StatePublished - May 2021

ASJC Scopus subject areas

  • Geology


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