Evaluation Of The Aardvark Constant Head Soil
Permeameter To Predict Saturated Hydraulic
Conductivity
Author(s)
E. Theron, P. A. L. Le Roux, M. Hensley & L. Van Rensburg
Abstract
The saturated hydraulic conductivity (Ksat) is a key parameter for analyzing or
modelling water flow and chemical transport in subsurface soil. Several methods
were developed over the last thirty years to measure Ksat which considered
unsaturated and/or saturated flow of water around the holes where measurements
are made. Most methods make use of devices to measure the infiltration rate into
the soil and in combination with numerical models predict the Ksat parameter. If
maximum infiltration rate exceeds the infiltration capacity, runoff will be the
consequence. Therefore maintaining a constant head means the rate of water
supplied corresponds to the infiltration capacity. Commonly used devices for
infiltration capacity measurements are infiltrometers, disc permeameters,
sprinkler infiltrometers and different types of constant head permeameters. This
paper evaluates the theory and practical application of the Aardvark constant
head soil permeameter (ACHSP) in combination with the Glover equation for
field measurement of Ksat above the water table. The Glover equation has been
criticized during the eighties because only the saturated flow around the hole was
considered in its development. Several papers published since 2002, however,
demonstrated that the Glover equation results are relatively close to the results
obtained by other models for most practical applications and therefore the use of
the Glover equation is justified.
Keywords: saturated hydraulic conductivity, constant head permeameter, Glover
equation, double ring infiltrometer.
Keywords
saturated hydraulic conductivity, constant head permeameter, Glover
equation, double ring infiltrometer
Related Book
Other papers in this volume
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