Surface Measurements Of Hydraulic Properties
In An Irrigated Soil Using A Disc Permeameter
Author(s)
A. Comegna, G. Severino & A. Sommella
Abstract
With a view to determining in situ the hydraulic properties of soils with
macropores, disc permeameters are currently used which allow evaluation over
time of water infiltration values and selective activation of preferential flow
paths through variation in water supply potential imposed on the soil surface. It
is then possible, through the resolution of wetting 3-D flow fields, to obtain soil
hydraulic characteristics at or near saturation. In this study two different methods
to calculate the hydraulic conductivity of a structured soil, based on
disc-permeameter data, are compared. Laboratory core measurements based on
the crust method are also used in the comparison. The first method based on a
single disc at the same location with multiple water supply potentials gave
results that are accurate, whereas the second method based on a single disc at
different locations and water supply potentials gave biased values. The
advantage of the examined equipment and procedures is that they are simple to
apply and use. Moreover, useful applications of disc-permeameter techniques
also consist in the measurement of soil structural parameters, especially pore size
and areal macroporosity under irrigation practice.
Keywords: 3-D infiltration, disc permeameter, unsatured flow parameters.
1 Introduction
In recurrent open field situations, above all in soil surface layers, structural and
textural variations as well as various geometric characteristics of the matrix may
entail significant space-time variations in the processes of water and solute
movement.
The action of raindrops, the boundary forces provoked by surface flows and
chemo-physical factors linked to water quality may, on the soil surface, lead to
Keywords
3-D infiltration, disc permeameter, unsatured flow parameters.
Related Book
Other papers in this volume
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