Resumo

SALAS-MARTINEZ, Rodiberto et al. Hydrological modelling of Mixteco River watershed in the State of Oaxaca, México. Agrociencia [online]. 2014, vol.48, n.1, pp.1-15. ISSN 2521-9766.

Mixteco river basin in the state of Oaxaca, México, has a strong degradation of its natural resources, soil, water and vegetation. The aim of this study was to calibrate and validate the hydrological model SWAT (Soil and Water Assessment Tool), to serve as a tool for predicting biomass production, runoff and sediment on a monthly basis in the Mixteco river basin in Oaxaca, México. The data used for the model's calibration and validation are from the period 1986 to 1990 and were obtained from the hydrometric station Mariscala; the first three years were selected for calibration and the remaining two years for validation. In biomass calibration the coefficient of determination (R²) was 0.72. For sediment yield only calibration was performed but not validation due to the limited availability of sediments measured at the gaging station. In the calibration of sediments, R² was 0.71 and the slope of the line of the values measured against the simulated was 1.18. In the calibration of runoff production the annual R² was 0.94 and the monthly R² 0.83; in the validation of the same variable annual R² was 0.93 and monthly R² was 0.82.

Palavras-chave : SWAT biomass; SWAT calibration; runoff production; sediment production.

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