Free: Andrew Short’s work (see below) forms the basis of the list of beaches on Surf Lifesaving’s Beachsafe website.
Purchase: The best reference is Andrew Short’s Beaches of the Tasmanian Coast and Islands (2006) published by the University of Sydney. It used to be freely available on the web as a pdf, but you can buy it on the University of Sydney site and you can also find it on various other library or bookshop sites. He has a section on beach processes and then a numbered inventory – where numbers exist on my blog posts it’s these beach numbers I’m referring to. It’s an excellent resource if you’re serious about beaches.