Now that I can comment on notebooks, I thought I'd point out that this model of water waves can be improved a bit by accounting for the depth of the particle, i.e. the amplitude of the circular motion decreases exponentially as the depth increases. That's illustrated in [this recently published notebook](https://observablehq.com/@mcmcclur/water-waves). (Please excuse the old-style programming - I just transferred an old web page over. Love the new functionality, by the way, and thanks!!

Good point! I was mostly trying to make something pretty here, rather than accurately model wave motion. I’ve added a link to your notebook.