I made a 25 second video of the seemingly gentle movement on the surface of the Derwent River as it moved backwards and forwards to and from the Alum Cliffs, as seen through dry forest. It was rather hypnotic and I can now see the video would have been more powerful if longer.
To see South of Hinsby Beach with waves on the Derwent River Tasmania go to : https://www.youtube.com/watch?v=MdnLETfiRWA