Geodesic
Boundary observability of gravity water waves
Annales de l'I.H.P. Analyse non linéaire, Tome 35 (2018) no. 3, pp. 751-779
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Consider a three-dimensional fluid in a rectangular tank, bounded by a flat bottom, vertical walls and a free surface evolving under the influence of gravity. We prove that one can estimate its energy by looking only at the motion of the points of contact between the free surface and the vertical walls. The proof relies on the multiplier technique, the Craig–Sulem–Zakharov formulation of the water-wave problem, a Pohozaev identity for the Dirichlet to Neumann operator, previous results about the Cauchy problem and computations inspired by the analysis done by Benjamin and Olver of the conservation laws for water waves.

DOI : 10.1016/j.anihpc.2017.07.006
Keywords: Boundary observability, Water-wave equations, Cauchy problem, Pohozaev identity 
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     title = {Boundary observability of gravity water waves},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {751--779},
     year = {2018},
     publisher = {Elsevier},
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Alazard, Thomas. Boundary observability of gravity water waves. Annales de l'I.H.P. Analyse non linéaire, Tome 35 (2018) no. 3, pp. 751-779. doi: 10.1016/j.anihpc.2017.07.006

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