1. Proudman Oceanographic Laboratory, Joseph Proudman Building, 6 Brownlow Street, Liverpool L3 5DA, UK
2. CICESE, Km. 107 Carretera Tijuana - Ensenada C.P. 22860, Ensenada, B.C., México
3. Department of Civil Engineering, Katholieke Universiteit Leuven, Kasteelpark Arenberg, 40, 3001 Heverlee, Belgium
4. Laboratory of Maritime Engineering, Universidad Politecnica de Catalunya, Jordi Girona, 1-3, Barcelona 08034, Spain