DETERMINATION OF DIFFUSIVITY AND HYDRAULIC CONDUCTIVITY IN SOILS AT LOW WATER CONTENTS FROM NONDESTRUCTIVE TRANSIENT FLOW OBSERVATIONS

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Abstract
We present an experimental method that nondestructively, relatively quickly, and reproducibly develops data necessary for finite-difference calculations in liqud-vapor diffusivities for water contents between approximately 1% and any intermediate value of interest. Diffusivity functions for five different soils, ranging in texture from fine sands by a clay loam were determined. Vapor absorption and transport mechanisms are discussed in the context of the liquid-vapor diffusivity function, using experimentally measured vapor absorption isotherms. Conductivities calculated from results of experiments conducted using thermocouple psychrometers to nondestructively measure suction heads in a clay loam during the flow process are also presented.

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