On the formation of current ripples
Bartholdy, J.; Ernstsen, V.B.; Flemming, B.W.; Winter, C.; Bartholomä, A.; Kroon, A. (2015). On the formation of current ripples. NPG Scientific Reports 5(11390): 9 pp. http://dx.doi.org/10.1038/srep11390
In: Scientific Reports (Nature Publishing Group). Nature Publishing Group: London. ISSN 2045-2322; e-ISSN 2045-2322, meer
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| Auteurs | | Top |
- Bartholdy, J.
- Ernstsen, V.B.
- Flemming, B.W.
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- Winter, C.
- Bartholomä, A.
- Kroon, A.
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| Abstract |
For grain sizes finer than coarse sand, the first flow-transverse bedforms to develop are current ripples. Although numerous studies have analysed different aspects of bedform morphodynamics, to date no comprehensive physical explanation for the formation of ripples has been given. We offer such an explanation based on a virtual boundary layer concept, and present a model predicting ripple height on the basis of grain size, current velocity and water depth. The model contradicts the conventional view of current ripples as bedforms not scaling with flow depth. Furthermore, it confirms the dependence of ripple dimensions on grain size, and their relative insensitivity to flow strength. |
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