Land cover and climate change effects on streamflow and sediment yield: a case study of Tapacurá River basin, Brazil
Other literature type
Santos, J. Y. G.
Silva, R. M.
Carvalho Neto, J. G.
Montenegro, S. M. G. L.
Santos, C. A. G.
Silva, A. M.
(issn: 2199-899X, eissn: 2199-899X)
This study assesses the impact of the land use and climate changes between
1967–2008 on the streamflow and sediment yield in Tapacurá River basin
(Brazil) using the Soil and Water Assessment Tool (SWAT) model. The model
was calibrated and validated by comparing simulated mean monthly streamflow
with observed long-term mean monthly streamflow. The obtained
<i>R</i><sup>2</sup> and Nash–Sutcliffe efficiency values to streamflow data
were respectively 0.82 and 0.71 for 1967–1974, and 0.84 and 0.82 for
1995–2008. The results show that the land cover and climate change
affected the basin hydrology, decreasing the streamflow and sediment yield
(227.39 mm and 18.21 t ha<sup>−1</sup> yr<sup>−1</sup> for 1967–1974 and 182.86 mm and
7.67 t ha<sup>−1</sup> yr<sup>−1</sup> for 1995–2008). The process changes are arising mainly due to the land
cover/use variability, but, mainly due to the decreasing in the rainfall
rates during 1995–2008 when compared with the first period analysed, which
in turn decreased the streamflow and sediments during the wet seasons and
reduced the base flow during the dry seasons.