Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Formation of aeolian ripples and sand sorting   We present a continuous model capable of demonstrating some salient features
of aeolian sand ripples: the realistic asymmetric ripple shape, coarsening of
ripple field at the nonlinear stage of ripple growth, saturation of ripple
growth for homogeneous sand, typical size segregation of sand and formation of
armoring layers of coarse particles on ripple crests and windward slopes if
sand is inhomogeneous.

19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs