Articles | Volume 19, issue 10
https://doi.org/10.5194/hess-19-4183-2015
https://doi.org/10.5194/hess-19-4183-2015
Research article
 | 
20 Oct 2015
Research article |  | 20 Oct 2015

Understanding runoff processes in a semi-arid environment through isotope and hydrochemical hydrograph separations

V. V. Camacho Suarez, A. M. L. Saraiva Okello, J. W. Wenninger, and S. Uhlenbrook

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Cited articles

Allen, R. G., Pereira, L. S., Raes, D., and Smith, M.: Crop evapotranspiration – Guidelines for computing crop water requirements, FAO Irrigation and drainage paper 56, Food and Agriculture Organization of the United Nations, Rome, 1998.
Bazemore, D. E., Eshleman, K. N. and Hollenbeck, K. J.: The Role of Soil-Water in Stormflow Generation in a Forested Headwater Catchment – Synthesis of Natural Tracer and Hydrometric Evidence, J. Hydrol., 162, 47–75, https://doi.org/10.1016/0022-1694(94)90004-3, 1994.
Blöschl, G., Sivapalan, M., Wagener, T., Viglione, A., and Savenije, H.: Runoff prediction in ungauged basins, Cambridge University Press, 2013.
Burns, D. A., McDonnell, J. J., Hooper, R. P., Peters, N. E., Freer, J. E., Kendall, C., and Beven, K.: Quantifying contributions to storm runoff through end-member mixing analysis and hydrologic measurements at the Panola Mountain Research Watershed (Georgia, USA), Hydrol. Process., 15, 1903–1924, https://doi.org/10.1002/Hyp.246, 2001.
Burns, D. A.: Stormflow-hydrograph separation based on isotopes: the thrill is gone – what's next?, Hydrol. Process., 16, 1515–1517, https://doi.org/10.1002/Hyp.5008, 2002.
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Isotope and hydrochemical tracers are tested providing new insights to isotope hydrograph in semi-arid areas in southern Africa. This study provides a spatial hydrochemical characterization of surface and groundwater sources, end member mixing analysis, and two- and three-component hydrograph separations. Results showed that the Kaap catchment is mainly dominated by groundwater sources, and direct runoff is positively correlated with the Antecedent Precipitation Index during the wet season.