%0 Journal Article %T A variational formulation for steady surface water waves on a Beltrami flow %A J. Horn %A M. D. Groves %J - %D 2020 %R 10.1098/rspa.2019.0495 %X This paper considers steady surface waves riding a Beltrami flow (a three-dimensional flow with parallel velocity and vorticity fields). It is demonstrated that the hydrodynamic problem can be form.. %U https://royalsocietypublishing.org/doi/10.1098/rspa.2019.0495