SENSIBILIDADE DOS PARÂMETROS HIDROSSEDIMENTOLÓGICOS DO MODELO SWAT EM UMA BACIA NA AMAZÔNIA OCIDENTAL: BACIA DO RIO MACHADINHO/RO

This work performs a sensitivity analysis of the SWAT model parameters to find an optimal set for which the model proves more robust for the production of flow and sediment in the Machadinho river watershed in Rondônia. Initially, a database was built, including climate information, topography, land use and soil classification retrieved from orbital platforms, what allowed then to simulate the hydrological behavior of the watershed from 1995 to 2000. In the next step, we used the LH-OAT method to rank from the most sensitive parameter to the one with the lowest sensitivity, the 32 parameters that influence the generation of flow and sediment in SWAT. In general, the sensitivity observed forthe model parameters in this research work was similar to the results presented in other studies developed in Brazil, highlighting that the two highest sensitivity values to flow were related to Gwqmn and Sol_Awc, both corresponding to the flow in the vadoze zone and in the saturated zone, while for the sediment component, the SWAT model applied to the 1 *Doutorando em Engenharia Civil pelo Programa de Engenharia Civil, COPPE, Universidade Federal do Rio de Janeiro. vass1000@gmail.com. 2 Mestre em Engenharia Civil Programa de Engenharia Civil, COPPE, Universidade Federal do Rio de Janeiro. 3 Laboratório de Recursos Hídricos e Meio Ambiente (LABH2O), Programa de Engenharia Civil, Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa em Engenharia – COPPE, Universidade Federal do Rio de Janeiro, Campus Ilha do Fundão – Cidade Universitária, Caixa Postal 68540, CEP 21.945-970 – Rio de Janeiro RJ, Brasil.