Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experiments on barotropic-baroclinic conversion and the applicability of
  linear n-layer internal wave theories   Interfacial internal waves in a stratified fluid excited by periodic
free-surface perturbations in a closed tank are studied experimentally.
Barotropic-baroclinic energy conversion is induced by the presence of a bottom
obstacle. The connection between horizontal surface velocities and internal
wave amplitudes is investigated, the developing flow patterns are described
qualitatively, and the wave speeds of internal waves are systematically
analyzed and compared to linear 2- and 3-layer theories. We find that, despite
of the fact that the observed internal waves can have considerable amplitudes,
a linear 3-layer approximation still gives fairly good agreement with the
experimental results.

7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
9
The categories of this paper are: nlin