Soil Water Dynamics

Front Cover
Oxford University Press, 2003 M02 13 - 416 pages
This book presents a rigorous mathematical development of soil water and contaminant flow in variably saturated and saturated soils. Analytical and numerical methods are balanced: computer programs, among them MathCad and Fortran, are presented, and more than 150 practice and discussion questions are included. Students are thus exposed not only to theory but also to an array of solutions techniques. Those using the book as a reference will appreciate the careful development of basic flow equations, the inclusion of solutions and methodology currently available only in journals and proceedings volumes, and the examples and calculations directly applicable to their own work.

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Contents

The Soil System
3
Soil Water Flow
54
Saturated Flow
91
OneDimensional Absorption
135
OneDimensional Infiltration and Vertical Flow
167
Multidimensional Water Flow in Variably Saturated Soils
230
Solute and Contaminant Transport
298
References
369
Index
383
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Page 298 - In the every-day affairs of life it is more useful to reason forward, and so the other comes to be neglected. There are fifty who can reason synthetically for one who can reason analytically.
Page 135 - When you follow two separate chains of thought, Watson, you will find some point of intersection which should approximate to the truth.
Page 230 - You have formed a theory, then?" "At least I have got a grip of the essential facts of the case. I shall enumerate them to you, for nothing clears up a case so much as stating it to another person, and I can hardly expect your cooperation if I do not show you the position from which we start.
Page 239 - Jl(ud) (3-42) where J0 and Y0 are Bessel functions of the first and second kind of order 0.
Page xi - Reprinted by permission of Pearson Education, Inc., Upper Saddle River, NJ...
Page x - Solution to the one-dimensional linear moisture flow equation with water extraction.
Page x - Solute travel-time estimates for tile-drained fields, I. Theory, Soil Sci. Soc. Am. Proc., 39, 1020-1024, 1975a.
Page 7 - Or is the residual water content. The residual water content is somewhat arbitrarily defined as the water content at which the corresponding hydraulic conductivity is appreciably zero, but very often it is used as an empirical constant when fitting hydraulic functions. Equation (1-8) is often used with 9r = 0.
Page 56 - ReJ^^- (2-1.) where d is an effective pore diameter. The critical Reynolds number is much lower for porous media than for straight tubes, such as those assumed for flow in pipes. Wide ranges have been observed, but generally, for Re < 1, laminar conditions are expected (Scheidegger, 1957; Hillel, 1980).
Page 91 - ... arts, the Science of Deduction and Analysis is one which can only be acquired by long and patient study, nor is life long enough to allow any mortal to attain the highest possible perfection in it. Before turning to those moral and mental aspects of the matter which present the greatest difficulties, let the inquirer begin by mastering more elementary problems. Sherlock Holmes, A Study in Scarlet Sir Arthur Conan Doyle...

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