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Proceedings of the International Association of Hydrological Sciences An open-access publication for refereed proceedings in hydrology
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Volume 371
Proc. IAHS, 371, 189–193, 2015
https://doi.org/10.5194/piahs-371-189-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Proc. IAHS, 371, 189–193, 2015
https://doi.org/10.5194/piahs-371-189-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

  12 Jun 2015

12 Jun 2015

Land cover and climate change effects on streamflow and sediment yield: a case study of Tapacurá River basin, Brazil

J. Y. G. Santos1, R. M. Silva2, J. G. Carvalho Neto3, S. M. G. L. Montenegro3, C. A. G. Santos4, and A. M. Silva2 J. Y. G. Santos et al.
  • 1Federal University of Western Bahia, Center for Humanities, Barreiras, Brazil
  • 2Federal University of Paraíba, Department of Geosciences, João Pessoa, Brazil
  • 3Federal University of Pernambuco, Department of Civil Engineering, Recife, Brazil
  • 4Federal University of Paraíba, Department of Civil and Environmental Engineering, João Pessoa, Brazil

Abstract. 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 R2 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−1 yr−1 for 1967–1974 and 182.86 mm and 7.67 t ha−1 yr−1 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.

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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 SWAT model. The model was calibrated and validated. The results show that the land cover and climate change affected the basin hydrology, decreasing the streamflow and sediment yield. 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.
This study assesses the impact of the land use and climate changes between 1967−2008 on the...
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