Análise de aplicabilidade da interface do modelo hidrológico Swat-sig no estudo da produção de sedimentos em uma bacia no Nordeste do Brasil

Abstract

Hydrological models over time have been used in environmental studies, therefore help in understanding the changes of use and occupation land, and can predict future changes in the hydrological regime of the Watershed. Considering this fact, the present study evaluated the production of sediments in the river basin Mundaú using the SWAT model. Thus, we created tabular database and spatial were required by the model, was held discretization of the basin and sub-basins and the simulations were made. It was made the calibration and validation the model by manual manipulation of the parameters most sensitive basin. The data simulated by the model were compared to the observed data of flow and sediment, collected at Station Farm Boa Fortuna. The evidence of the efficiency of the model was analyzed using statistics: NASH (Nash-Sutcliffe coefficient), PBIAS (percentage of trend) and RSR (ratio of the standard error of mean and standard deviation of the observed data). The results showed that the SWAT model showed a good ability to reproduce the flow drained to the daily level, relative to sediment production, the model did not fit adequately to the data available.