A Comparative Analysis Of The PRMS And J2000
Hydrological Models Applied To The Sandspruit
Catchment (Western Cape, South Africa)
Author(s)
R. D. H. Bugan, N. Z. Jovanovic, W. P. De Clercq,
J. Helmschrot, W.-A. Fluegel & G. H. Leavesley
Abstract
The applicability of distributed hydrological models to the semi-arid conditions
in the Western Cape was investigated through the application of PRMS and
J2000 in the Sandspruit Catchment. The Sandspruit is an annual river, with the
catchment receiving 300-400 mm/a of rainfall. The catchment exhibits shallow
soils, with the dominant land uses being cultivated lands and pastures. To
optimise the parameterisation of the models, 21 boreholes were drilled
throughout the catchment for data collection and to get a better conceptual
understanding of the catchment’s hydrologic conditions. Field evidence suggests
that subsurface flow is the dominant contributor of streamflow and thus the
models were calibrated accordingly. The models were run for a 20 year period.
Both models were able to match the timing of seasonal hydrograph responses,
however they were not able to match annual discharge volumes. Annual
discharge was overestimated in certain cases and underestimated in others. Both
models exhibited daily Nash-Sutcliffe Efficiencies of below 0.4. As the models
were parameterised and calibrated manually, the feasibility of using automatic
techniques needs to be investigated.
Keywords: Sandspruit, PRMS, J2000, semi-arid climate, distributed hydrologic
modelling, parameterisation, calibration, Nash-Sutcliffe Efficiency.
Keywords
Sandspruit, PRMS, J2000, semi-arid climate, distributed hydrologic
modelling, parameterisation, calibration, Nash-Sutcliffe Efficiency
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