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Modeling emergent large-scale structures of barchan dune fields

Publication ,  Journal Article
Worman, SL; Murray, AB; Littlewood, R; Andreotti, B; Claudin, P
Published in: Geology
October 1, 2013

In nature, barchan dunes typically exist as members of larger fields that display striking, enigmatic structures that cannot be readily explained by examining the dynamics at the scale of single dunes, or by appealing to patterns in external forcing. To explore the possibility that observed structures emerge spontaneously as a collective result of many dunes interacting with each other, we built a numerical model that treats barchans as discrete entities that interact with one another according to simplified rules derived from theoretical and numerical work and from field observations: (1) Dunes exchange sand through the fl uxes that leak from the downwind side of each dune and are captured on their upstream sides; (2) when dunes become sufficiently large, small dunes are born on their downwind sides ("calving"); and (3) when dunes collide directly enough, they merge. Results show that these relatively simple interactions provide potential explanations for a range of field-scale phenomena including isolated patches of dunes and heterogeneous arrangements of similarly sized dunes in denser fields. The results also suggest that (1) dune field characteristics depend on the sand fl ux fed into the upwind boundary, although (2) moving downwind, the system approaches a common attracting state in which the memory of the upwind conditions vanishes. This work supports the hypothesis that calving exerts a first-order control on field-scale phenomena; it prevents individual dunes from growing without bound, as single-dune analyses suggest, and allows the formation of roughly realistic, persistent dune field patterns. © 2013 Geological Society of America.

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Published In

Geology

DOI

EISSN

1943-2682

ISSN

0091-7613

Publication Date

October 1, 2013

Volume

41

Issue

10

Start / End Page

1059 / 1062

Related Subject Headings

  • Geochemistry & Geophysics
  • 37 Earth sciences
  • 04 Earth Sciences
 

Citation

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Worman, S. L., Murray, A. B., Littlewood, R., Andreotti, B., & Claudin, P. (2013). Modeling emergent large-scale structures of barchan dune fields. Geology, 41(10), 1059–1062. https://doi.org/10.1130/G34482.1
Worman, S. L., A. B. Murray, R. Littlewood, B. Andreotti, and P. Claudin. “Modeling emergent large-scale structures of barchan dune fields.” Geology 41, no. 10 (October 1, 2013): 1059–62. https://doi.org/10.1130/G34482.1.
Worman SL, Murray AB, Littlewood R, Andreotti B, Claudin P. Modeling emergent large-scale structures of barchan dune fields. Geology. 2013 Oct 1;41(10):1059–62.
Worman, S. L., et al. “Modeling emergent large-scale structures of barchan dune fields.” Geology, vol. 41, no. 10, Oct. 2013, pp. 1059–62. Scopus, doi:10.1130/G34482.1.
Worman SL, Murray AB, Littlewood R, Andreotti B, Claudin P. Modeling emergent large-scale structures of barchan dune fields. Geology. 2013 Oct 1;41(10):1059–1062.

Published In

Geology

DOI

EISSN

1943-2682

ISSN

0091-7613

Publication Date

October 1, 2013

Volume

41

Issue

10

Start / End Page

1059 / 1062

Related Subject Headings

  • Geochemistry & Geophysics
  • 37 Earth sciences
  • 04 Earth Sciences