Thetwo-layered (0 - 50 and 50 - 250 mm)
surface horizon hydraulic parameters of three dryland floodplain soil-types
under aquafer water management in Postmasburg, Northern Cape Province of South
Africa were estimated with HYDRUS-1D model. Time dependent water infiltration
measurements at 30 and 230 mm depths from simulated rainfalls on undisturbed 1
m2small plots with
intensities of 1.61 (high), 0.52 (medium) and 0.27 (low) mm·min-1,
were minimised using a two-step inversion. Firstly, separate
optimisation of the van Genuchten-Mualem model parameters for the two
surface-horizon layers and secondly,simultaneous
optimisation for the joint two-layered horizon with first step optimal
parameters entered as initial values. The model reproduced transient
water-infiltration data very well with the Nash-Sutcliffe model efficiency
coefficient (NSE) of 0.99 and overestimated runoff (NSE; 0.27 to
0.98). The upper surface horizon had highly optimised and variable parameters
especiallyθsandKs. Optimal
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