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Particle dynamics of a cartoon dune

DOI zum Zitieren dieses Dokuments: https://doi.org/10.1088/1367-2630/12/6/063025
URN zum Zitieren dieses Dokuments: urn:nbn:de:bvb:703-epub-3957-7

Titelangaben

Groh, Christopher ; Rehberg, Ingo ; Krülle, Christof A.:
Particle dynamics of a cartoon dune.
In: New Journal of Physics. Bd. 12 (Juni 2010) . - no. 063025.
ISSN 1367-2630
DOI: https://doi.org/10.1088/1367-2630/12/6/063025

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Abstract

The spatio-temporal evolution of a downsized model for a desert dune is observed experimentally in a narrow water flow channel. A particle tracking method reveals that the migration speed of the model dune is one order of magnitude smaller than that of individual grains. In particular, the erosion rate consists of comparable contributions from creeping (low-energy) and saltating (high-energy) particles. The saltation flow rate is slightly larger, whereas the number of saltating particles is one order of magnitude lower than that of the creeping ones. The velocity field of the saltating particles is comparable to the velocity field of the driving fluid. It can be observed that the spatial profile of the shear stress reaches its maximum value upstream of the crest, while its minimum lies at the downstream foot of the dune. The particle tracking method reveals that the deposition of entrained particles occurs primarily in the region between these two extrema of the shear stress. Moreover, it is demonstrated that the initial triangular heap evolves to a steady state with constant mass, shape, velocity and packing fraction after one turnover time has elapsed. Within that time the mean distance between particles initially in contact reaches a value of approximately one quarter of the dune basis length.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Keywords: Nonlinear dynamics; Pattern formation; Spatially extended systems; Granular matter; Dune formation
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Institutionen der Universität: Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Experimentalphysik V > Lehrstuhl Experimentalphysik V - Univ.-Prof. Dr. Ingo Rehberg
Profilfelder > Advanced Fields > Nichtlineare Dynamik
Fakultäten
Fakultäten > Fakultät für Mathematik, Physik und Informatik
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Experimentalphysik V
Profilfelder
Profilfelder > Advanced Fields
Sprache: Englisch
Titel an der UBT entstanden: Ja
URN: urn:nbn:de:bvb:703-epub-3957-7
Eingestellt am: 20 Feb 2019 10:25
Letzte Änderung: 20 Feb 2019 10:25
URI: https://epub.uni-bayreuth.de/id/eprint/3957

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