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High Intensity X-Ray and Tensiometer Measurements in Rapidly Changing Preferential Flow Fields

Dep. of Agricultural and Biological Engineering, Cornell Univ., Ithaca, NY 14853

Barnes R. Bierck

Dep. of Civil, Mechanical, and Environmental Engineering, George Washington Univ., Washington, DC 20052

John S. Selker

Dep. of Bioresource Engineering, Oregon State Univ., Corvallis, OR 97331

*Corresponding author.

ABSTRACT

Synchrotron x-rays at the Cornell High Energy Synchrotron Source (CHESS) and other available facilities provide a high-resolution means of quantitatively studying rapid changes of fluid content in porous media. This technique is based on monitoring x-ray absorbance changes in sand volumes traversed by an intense, highly collimated synchrotron x-ray beam. The high intensity and brightness of synchrotron radiation permit acquisition of statistically significant x-ray count data each second during the drying process of fingered flow. Simultaneous measurement of water pressure using tensiometers provides a reliable dynamic measurement of drying curves.

Received for publication April 27, 1992.

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