Coastal Structures are undergoing renewal and innovation to better serve the needs of our society - from environmental co-existence and habitat enhancement to risk management. The CSt07 conference is the fifth in a series that highlight significant progress in the innovation, design and construction of coastal structures. Proceedings of these CSt conferences have yielded milestone works, frequently cited references in the field. This two-volume proceedings contains the final revised version of 178 papers that have been reviewed, selected and discussed at the CSt07 conference. The volume brings to readers a comprehensive range of contributions, covering all aspects of research, design, construction, and maintenance of coastal structures including new up-to-date interesting topics, such as tsunamis and storm surge defences, climate change, piled coastal structures as well as ecological issues, a new addition to the traditional program.