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      Influence of “defects” on sorted bedform dynamics

      Huntley, David A.; Coco, Giovanni; Bryan, Karin R.; Murray, A. Brad
      DOI
       10.1029/2007GL030512
      Link
       onlinelibrary.wiley.com
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      Citation
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      Huntley, D. A., Coco, G., Bryan, K. R., & Murray, A. B. (2008). Influence of “defects” on sorted bedform dynamics. Geophysical Research Letters, 35(2), L02601.
      Permanent Research Commons link: https://hdl.handle.net/10289/8198
      Abstract
      Bedforms with plan-view patterns consisting of long crests interrupted by defects occur ubiquitously in subaqueous and subaerial environments where they strongly influence flows and sediment transport. We explore how such patterns adjust to changes in the external forcing. We utilize a numerical model of a wide-spread, large-scale seabed pattern, ‘sorted bedforms,’ examining their response to changes in wave forcing. Numerical experiments show that the pattern adjustment progresses through two stages characterized by defect propagation and defect creation, respectively, and that the rates of the initial stage, and therefore overall pattern adjustment, are determined by the initial defect density. All characteristics of the sorted bedforms are similarly influenced by the presence of defects. Although the processes of growth are likely to be different for other types of bedforms, it is reasonable to expect they will be similarly influenced by defects in pre-existing patterns.
      Date
      2008
      Type
      Journal Article
      Publisher
      Wiley
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      • Science and Engineering Papers [3122]
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