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Automated In Situ Measurement of Unsaturated Soil Water Flux

Dep. of Soil Science and Plant Nutrition

J.J.M. van Grinsven^* and C. Dirksen

Dep. of Soil Science and Geology

*Corresponding author.

ABSTRACT

A device is presented which, based on new operation principles, intercepts unsaturated soil water fluxes within an error of 10% and can yield samples for subsequent chemical analysis and calculation of convective solute fluxes. Operation is controlled by a microprocessor which automatically adjusts the vacuum imposed on a porous filter cloth such that identical matric potentials are maintained just above the cloth and at the same depth in the neighboring soil. Contact resistances and internal resistance of the device are implicitly corrected by adjustment of suction. Laboratory and field tests in a loamy sand under steady and transient flow conditions showed that cumulative water fluxes could be measured within 10% of those calculated from storage changes, and from numerical and analytical flow models.

Contribution from the Dep. of Soil Science and Geology and Soil Science and Plant Nutrition, Agricultural Univ., Wageningen, The Netherlands.

Received for publication October 16, 1987.

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