1. Hydroinformatical Researcher, Dept. of Applied Mathematics III, Technical Univ. of Catalonia, Comte d’Urgell, 187, 08036 Barcelona, Spain (corresponding author).
2. Professor, ETSECCPB, FLUMEN Research Institute, DEHMA, Technical Univ. of Catalonia, Jordi Girona 1–3, 08034 Barcelona, Spain.
3. Professor, ETSECCPB, Dept. of Applied Mathematics III, Technical Univ. of Catalonia, Jordi Girona 1–3, 08034 Barcelona, Spain.