Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An optimization problem related to water artificial recirculation for
  controlling eutrophication   In this work, the artificial recirculation of water is presented and
analyzed, from the perspective of the optimal control of partial differential
equations, as a tool to prevent eutrophication effects in large waterbodies. A
novel formulation of the environmental problem, based on the coupling of
nonlinear models for hydrodynamics, water temperature and concentrations of the
different species involved in the eutrophication processes, is introduced.
After a complete and rigorous analysis of the existence of optimal solutions, a
full numerical algorithm for their computation is proposed. Finally, some
numerical results for a realistic scenario are shown, in order to prove the
efficiency of our approach.

21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat