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Geology; September 1997; v. 25; no. 9; p. 771-774; DOI: 10.1130/0091-7613(1997)025<0771:BFDDTT>2.3.CO;2
© 1997 Geological Society of America
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Bed-form dynamics: Does the tail wag the dog?

B. T. Werner1 and G. Kocurek2

1 Department of Geological Sciences, University of Texas, Austin, Texas 78712
2 Institute of Geophysics and Planetary Physics, University of California—San Diego, La Jolla, California 92093-0225

Bed-form patterns reflect the dynamics of the defects in the pattern. From this new hypothesis, the differential migration of defects within a field of bed forms determines how crest-line orientation responds to changing transport conditions. Predictions from a model for defect dynamics compare well to field measurements and computer simulations of bed-form orientation. This model permits quantification of the time for bed-form reorientation across a broad range of scales, from hours in the rapidly changing nearshore environment to thousands of years for linear dune fields.




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