Methodology for safety assessment 2015. Background report on wave transformation and overtopping calculation by SWASH

A new Safety Assessment methodology has been developed for the 'Safety Assessment 2015'. One of the key changes compared to the last Safety Assessment methodology for the ‘Safety Assessment 2007’ is the introduction of a numerical model SWASH for wave transformation and wave overtopping calculations. This document is a technical support document (i.e. introduction of SWASH model) showing the necessities and reasons for the changes, the background theories, applicability, validation and new methodologies including some limitations of the model. Finally, all the detailed methodologies related to wave transformation and wave overtopping using SWASH for the ‘Safety Assessment 2015’ are mainly determined based on this document.