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Water SA

On-line version ISSN 1816-7950
Print version ISSN 0378-4738

Abstract

VAN TOL, JJ; VAN ZIJL, GM; RIDDELL, ES  and  FUNDISI, D. Application of hydropedological insights in hydrological modelling of the Stevenson-Hamilton Research Supersite, Kruger National Park, South Africa. Water SA [online]. 2015, vol.41, n.4, pp.525-533. ISSN 1816-7950.  http://dx.doi.org/10.4314/WSA.V41I4.12.

Soil information is increasingly sought after for hydrological modelling, as the importance of soil in the hydrological cycle is understood better. In this paper the output of a digital soil mapping exercise was used as the soil input into a distributed hydrological model (ACRU) for a test site within the Stevenson-Hamilton Research Supersite, Kruger National Park (South Africa). The aim was to determine the effect of parameterising a hydrological model with increased levels of soil information, at different scales. To accommodate this aim, ACRU was run in 3 different modes, each with increasing levels of input, on 3 catchments, including a 1st, 2nd and 3rd order catchment. The outputs evaluated included both streamflow and soil water content at selected soil profiles. Simulation accuracy increased with higher levels of soil input, as well as with increasing catchment size. The improved accuracy with increased soil input underscores the value of detailed soil information in modelling, while the improved results with increased catchment size show that the optimal scale for including soil information has not yet been reached.

Keywords : ACRU; digital soil mapping; hillslope hydrology; hydropedology; Kruger National Park.

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