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Calibration of a modelling approach for sediment yield in a wattle plantation, KwaZulu-Natal, South Africa

B.C. Scott-Shaw
T.R. Hill
J.S. Gillham


Hydrological modelling is an appropriate approach to investigate the effect of interactions of climate, landuse and soil on the water-use of natural or managed ecosystems, in particular where spatial heterogeneity exists. The Soil and Water Assessment Tool (SWAT) model has evolved into one of  the most widely used catchment-scale hydrological models, which has been extensively used to better understand hydrological processes. In this paper, the SWAT model was adopted to simulate a wattle plantation in KwaZulu-Natal, South Africa. User-defined vegetation growth, soil and management input parameters were constructed for the study area based on site measurements. These parameters were subsequently modified using the Sequential Uncertainty Fitting (SUFI-2) analysis routine to calibrate the model. The calibrated model captured seasonal trends in the observed sediment and streamflow data. The compilation of spatially explicit sediment output provides a useful approach to manage catchments by identifying high erosion-risk areas. The SWAT model, using site-specific input parameters, provides a platform for subsequent hydrological and  sediment modelling in South Africa.

Keywords: commercial plantations modelling sediment yield surface run-off SWAT

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eISSN: 1816-7950
print ISSN: 0378-4738