The nature of material coordinate transformations and their importance to the theoretical interpretation of time‐dependent data taken on swelling soil‐water‐air systems is discussed. A material coordinate transformation that is based on a special case of a general relation derived by Raats and Klute, but that has not yet been applied to swelling soil, is proposed as a useful expression with which to describe one‐dimensional soil water processes in the field. This transformation requires only the measurement of bulk density in time sequence from a set of one or more fixed points and, therefore, should be especially valuable when used in conjunction with dual energy gamma‐ray measurements of soil profile properties. An illustrative application of the proposed transformation is made to interpret dual energy gamma‐ray data on the swelling of Avondale clay loam.
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Sposito et al. (1976) studied this question.