IIRC, "Principles of Underwater Sound" by Robert Urick [0] is considered pretty good.

A textbook that's helpful for actually implementing ocean acoustics models is "Computational Ocean Acoustics" by Jensen et al [1].

[0] https://www.amazon.com/Principles-Underwater-Sound-Robert-Ur...

[1] https://www.amazon.com/Computational-Acoustics-Modern-Signal...

Here's one place: http://oalib.hlsresearch.com/Rays/

If you want to actually understand it, this book is pretty good IIRC: https://www.amazon.com/Computational-Acoustics-Modern-Signal...