1. a Department of Civil Engineering, FCT , University of Coimbra , Polo II, 3030-290, Coimbra, Portugal
2. b School of Hydrography and Oceanography , Marinha-Instituto Hidrogràfico , R. das Trinas 49, Lisboa, Portugal E-mail:
3. c Investigador Coordenador of Hydraulics and Environment Department, , LNEC , Av. do Brasil 101, Lisboa E-mail: