Hi there, I'm a mechanical engineering student who's extremely interested in going into physical oceanography after finishing undergrad. I'm trying to find a good source for the wave equation as it relates to physical oceanography, as well as orbital paths of particles, and have yet to find one. Mechanical vibrations and differential equations have taught me about the wave equation as it relates to engineering, and specifically material mechanics, but I'm having a hard time relating it to fluids and ocean waves. Does anybody have any good explanations or sources for the derivation? Thanks!