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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Research Articles: Experimental Sedimentology
Fine-Grained Versus Coarse-Grained Wave Ripples Generated Experimentally Under Large-Scale Oscillatory Flow
Abstract
Wave ripples were generated in a wave tunnel under large-scale oscillatory flow (orbital diameter 1–4.5 m) using two different grain sizes, very fine sand and coarse sand. The geometry of bed configurations that were produced varied strongly as a function of grain size: small anorbital ripples (wavelengths ~ 10 cm, heights < 1 cm) formed exclusively in very fine sand at low oscillatory 
velocities
, whereas large orbital ripples (wavelengths 50–350 cm, heights 7–26 cm) formed in both very fine and coarse sand, but were subdued, sharp- to round-crested, and 2-D to 3-D in very fine sand, and steep, sharp-crested, and 2-D in coarse sand. The large ripples in fine sand, if aggraded, would deposit low-angle (5–15°) cross stratification resembling hummocky cross stratification, whereas the large ripples in coarse sand would deposit high-angle (15–25°) cross stratification that might be mistaken for the deposit of a dune because of its high dip angle and large set thickness (> 5 cm). These results support the hypothesis advanced by Leckie (1988) that large waves generate markedly different stratigraphic signatures in fine-grained and coarse-grained sediment.
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