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| Titel |
Permanent bedforms in a theoretical model of wave-sea-bed interactions |
| VerfasserIn |
J. M. Becker, D. Bercovici |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 7, no. 1/2 ; Nr. 7, no. 1/2, S.31-35 |
| Datensatznummer |
250004241
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| Publikation (Nr.) |
 copernicus.org/npg-7-31-2000.pdf |
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| Zusammenfassung |
| The interaction between sea waves and a
deformable sea-bed is studied with a simple two-layer model in which the
upper-layer fluid is inviscid and the lower-layer fluid is bi-viscous to account
for non-Newtonian behaviour of sand and sediments. The nonlinear response of the
system to periodic forcing by an external surface pressure is determined. It is
shown that a simple bi-viscous rheology allows small wavelength morphology in
the lower layer to be generated from large wavelength surface waves in the upper
inviscid layer, although the morphology is not permanent. For a bi-viscous
rheology with a pressure-dependent yield stress (which accounts for the fact
that sand yields less readily under loading than unloading), however, small
wavelength and permanent features are formed in the seabed. |
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