1. Assistant Professor, Centre for the Research and Technology of Agro-Environmental and Biological Sciences, CITAB, Univ. of Trás-os-Montes and Alto Douro, UTAD, Quinta de Prados, 5000-801 Vila Real, Portugal; and Instituto Dom Luiz, IDL, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, Edifício C8, Piso 3, 1749-016 Lisboa, Portugal (corresponding author).
2. Assistant Professor, Centre for the Research and Technology of Agro-Environmental and Biological Sciences, CITAB, Univ. of Trás-os-Montes and Alto Douro, UTAD, Quinta de Prados, 5000-801 Vila Real, Portugal; and Dept. of Engineering, Univ. of Trás-os-Montes and Alto Douro, UTAD, Quinta de Prados, 5000-801 Vila Real, Portugal.
3. M.Sc. Graduate of Civil Engineering, Dept. of Engineering, Univ. of Trás-os-Montes and Alto Douro, UTAD, Quinta de Prados, 5000-801 Vila Real, Portugal.
4. Associate Professor, Dept. of Meteorology, Univ. of Reading, Whiteknights, P.O. Box 217, Reading, Berkshire RG6 6AH, U.K.; and Institute for Geophysics and Meteorology, Univ. of Cologne, Pohligstr. 3, D-50969 Köln, Germany.