1. Full Professor and Civil Engineer, Research Group FLUMEN, Hydraulic, Maritime and Environmental Engineering Dept., Technical Univ. of Catalonia (DEHMA-UPC), 1-3 Jordi Girona St., Barcelona, 08034 Spain.
2. Associate Professor, Group of Hydraulic and Environmental Engineering, Technical School of La Almunia, Univ. of Zaragoza, Mayor St., La Almunia de Doña Godina 50100, Zaragoza, Spain.