1. Ph.D. Student, MSc, Hydraulics and Water Resources, Instituto Superior Técnico, Technical Univ. of Lisbon, Rua Francisco Sá de Miranda, 2 - 2 Esq°, 2800-087 Almada, Portugal. E-mail: ajtrelvas@gmail.com
2. Associate Professor, Dept. of Civil Engineering, Instituto Superior Técnico, Technical Univ. of Lisbon, IST, SHRHA, Av. Rovisco Pais, 1049-001 Lisboa, Portugal (corresponding author). E-mail: apinheiro@civil.ist.utl.pt