Translations:Wavefront for velocity linear with depth/6/es

${\begin{aligned}x_{W}{\rm {=}}r{\rm {\ cos\ }}\psi {\rm {=}}{\frac {v_{0}}{a}}{\rm {\ sinh\ }}\ {\textit {at}}\ {\rm {\ cos\ }}\varphi \\y_{W}{\rm {=}}y_{G}{\rm {+}}r{\rm {\ sin\ }}\psi \\{\rm {=}}{\frac {v_{0}}{a}}\left({\rm {\ cosh\ }}at-{\rm {1}}\right){\rm {+}}{\frac {v_{0}}{a}}{\rm {\ sinh\ }}\ {\textit {at}}{\rm {\ sin\ }}\varphi .\end{aligned}}$

(63)