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Modelling formation and evolution of transverse dune fields

Modelling formation and evolution of transverse dune fields,10.1142/S0129183105008400,Jae Hwan Lee,A. O. Sousa,E. J. R. Parteli,H. J. Herrmann

Modelling formation and evolution of transverse dune fields   (Citations: 3)
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We model formation and evolution of transverse dune fields. In the model, only the cross section of the dune is simulated. The only physical variable of relevance is the dune height, from which the dune width and velocity are determined, as well as phenomenological rules for interaction between two dunes of different heights. We find that dune fields with no sand on the ground between dunes are unstable, i.e. small dunes leave the higher ones behind. We then introduce a saturation length to simulate transverse dunes on a sand bed and show that this leads to stable dune fields with regular spacing and dune heights. Finally, we show that our model can be used to simulate coastal dune fields if a constant sand influx is considered, where the dune height increases with the distance from the beach, reaching a constant value.
Published in 2005.
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    • ...Various studies of transverse (Parteli and Herrmann, 2003; Lee et al., 2005) and barchan (Lima et al., 2002) dune fields have utilized this type of approach...
    • ...Lee et al., 2005), we utilize a multiscale approach by using the continuum model to understand interaction of a small number of dunes.Specifically,theinteractionfunctionisbasedupontheobserved dynamics of colliding dunes in the continuum dune model...
    • ...function used in Lee et al. (2005) to model transverse dune fields;...
    • ...One can, of course, use semi-infinite boundary conditions with no influx (or a temporary influx, as was used in Lee et al. (2005)...
    • ...Although the differences in the influx condition (our influx is continuous) make it difficult to compare the results by Lee et al. (2005) with our results, this shows that the studies do not contradict each other...
    • ...Fig. 17. This is Fig. 6 from Lee et al. (2005), showing the final number of dunes (Nf )a s a function of γ, averaged over 1000 simulations.100 dunes are injected, and then influx is...
    • ...For example, Durán et al. (2005) found an r⁎~0.12 (volume ratio) for zero-offset collisions between barchans (Fig. 6). Using a crossover value that low in this model (translated to r⁎=0.16 for the cross-sectional area ratio by Lee et al. (2005)), and assuming a uniformly distributed area influx starting with 10 m2...

    Serina Diniegaet al. Long-time evolution of models of aeolian sand dune fields: Influence o...

    • ...The phenomenological rule of the amount of interdune sand has been accounted for in a simple model of transverse dune field (Lee et al. 2005), where it has been shown that transverse dunes which develop on sand sheets are in fact predicted to present shorter interdune spacing...

    H. J. Herrmannet al. The coastal dunes of the Lenc ¸ ´ ois Maranhenses

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