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| Titel |
Transport capacity and saturation mechanism in a real-space cellular automaton dune model |
| VerfasserIn |
X. Gao, D. Zhang, O. Rozier, C. Narteau |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: Sediment Transport and Landscape Dynamics (SALADYN) Workshop 2012 ; Nr. 37 (2014-04-22), S.47-55 |
| Datensatznummer |
250121289
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| Publikation (Nr.) |
 copernicus.org/adgeo-37-47-2014.pdf |
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| Zusammenfassung |
| In a real-space cellular automaton dune model, individual physical
processes such as erosion, deposition and transport are implemented
by nearest neighbor interactions and a time-dependent stochastic
process. Hence, the transport capacity, the saturation mechanism
and the characteristic wavelength for the formation of dunes are
emergent properties that can only be determined a posteriori from
the output of the numerical simulations. Here we propose a simplified version
of the model to establish asymptotic relations between the microscopic
erosion-deposition-transport rate parameters and the characteristic
length and time scales of the flux saturation mechanism. In particular,
we show that, in the cellular automaton, the saturation length is a mean
transport distance controlled by the deposition of mobile sedimentary
cells. Then, we discuss how these results can be used to determine
the sediment flux within dune fields and
the rate parameters of a new class of discrete models that concentrate
on the effect of heterogeneities in grain-size on dune morphodynamics. |
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