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Unsaturated Zone Hydrology by Gary L. Guymon - Professor of Civil Engineering, Department of Civil and Environmental Engineering, University of California, Irvine CA 92717

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Chapter 10Model Uncertainty

Thus far this text has assumed flow and transport processes in the unsaturated zone could be modeled by deterministic means assuming a porous media continuum and using the principles of classical physics. Unfortunately, nearly every assumption that has been made to arrive at these deterministic models can be questioned. As Harr (1977) points out, porous media are made up of unknown geometries of discrete particles and a fuller understanding of the mechanics of particulate media requires at least some considerations of probability. Indeed, Freeze (1975) studied the problem of one-dimensional saturated flow and had “doubts about the presumed accuracy of the deterministic conceptual models that are so widely used in ...

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