Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Size distribution and structure of Barchan dune fields   Barchans are isolated mobile dunes often organized in large dune fields. Dune
fields seem to present a characteristic dune size and spacing, which suggests a
cooperative behavior based on dune interaction. In Duran et al. (2009), we
propose that the redistribution of sand by collisions between dunes is a key
element for the stability and size selection of barchan dune fields. This
approach was based on a mean-field model ignoring the spatial distribution of
dune fields. Here, we present a simplified dune field model that includes the
spatial evolution of individual dunes as well as their interaction through sand
exchange and binary collisions. As a result, the dune field evolves towards a
steady state that depends on the boundary conditions. Comparing our results
with measurements of Moroccan dune fields, we find that the simulated fields
have the same dune size distribution as in real fields but fail to reproduce
their homogeneity along the wind direction.

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The categories of this paper are: q-bio
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The categories of this paper are: stat
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The categories of this paper are: q-alg
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The categories of this paper are: quant-ph
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The categories of this paper are: econ
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph