1. Center of Water Resources and Environmental Studies, School of Engineering of Sao Carlos, University of Sao Paulo, Sao Carlos 13566-590, SP, Brazil
2. Forest Research Centre, School of Agriculture, University of Lisbon, 1349-17 Lisbon, Portugal
3. Centre of Geographical Studies, University of Lisbon, Rua Branca Edmée Marques, 1600-276 Lisbon, Portugal
4. Associate Laboratory TERRA, 1349-17 Lisbon, Portugal