The e-book “Variational method to water wave modelling“, co-authored by Didier Clamond (Good, France); Denys Dutykh (Kalifa, Saudia Arabia), and Dimitrios Mitsotakis (Victoria, New Zealand), has been printed by the IAHR. It’s a gold open entry e-book and is freely accessible to researchers worldwide (hyperlink right here). The e-book illustrates the benefit of utilizing variational rules involving as many dependent variables as attainable. Its main goal is to supply a generalized framework for deriving mannequin equations for water waves. The methodology is elucidated via a spread of novel examples. The screenshot beneath reveals the entrance web page of the e-book.