Modeling Field Infiltration into Unsaturated Clay
Publication: Journal of Geotechnical Engineering
Volume 116, Issue 10
Abstract
This paper describes the results of a numerical simulation of the observed field behavior of infiltration into an unsaturated clay. In particular, the autumnal recharge of 1984 is considered. A numerical solution of Richards's pressure‐based formulation is presented. A weighted residual finite element approach is adopted to achieve spatial discretization of the moisture flow domain. A fully implicit backward difference time‐stepping algorithm is employed to accommodate the transient nature of the problem. The application of the algorithm to the simulation of the problem at hand is described. The initial moisture content distribution is established from field‐measured data. Boundary conditions are determined from an interpretation of meteorological data. Material parameter identification based on experimental work on undisturbed clay samples is detailed. Comparisons of numerical results with field values collected by British Gas are given. Good correlation is obtained. The numerical simulation is capable of representing the observed field behavior, over the depth of summer moisture deficit penetration.
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References
1.
Abrishami, J. (1987). “An investigation into the flow of water in partially saturated sands and its representation using finite elements,” thesis presented to the University of Wales, at Cardiff, Wales, in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
2.
Alonso, E. E., Gens, A., and Hight, D. W. (1989). “Special problem soils—General report (session 5).” Proc., Ninth European Conf. on Soil Mech. and Found. Engrg., International Society of Soil Mechanics and Foundation Engineering, E. T. Han‐rahan, T. L. L. Orr, and T. F. Widdis, eds., 3, 1087–1146.
3.
Bell, J. P. (1976). “Neutron probe practice.” Report No. 19, Inst. of Hydro., Wall‐ingford, United Kingdom.
4.
Croney, D., and Coleman, J. D. (1954). “Soil structure in relation to soil suction (pF).” Soil Sci. J., 5(1), 75–84.
5.
Green, R. E., and Corey, J. C. (1971). “Calculation of hydraulic conductivity: A further evaluation of some predictive methods.” Soil Sci. Soc. Amer. J., 35(1), 3–8.
6.
Hall, D. G. M., et al. (1977). “Water retention, porosity and density of field soils.” Soil Survey of England and Wales, Technical monograph No. 19, Harpenden, United Kingdom.
7.
Huyakorn, P. S., Thomas, S. D., and Thompson, B. M. (1984). “Techniques for making finite elements competitive in modeling flow in variably saturated porous media.” Water Resour. Res., 20(8), 1099–1115.
8.
Neuman, S. P. (1973). “Saturated‐unsaturated seepage by finite elements.” J. Hydr. Div., ASCE, 99(12), 2233–2249.
9.
Owen, R. C. (1984). “Vegetation and seasonal ground movement effects on buried mains.” Proc., 3rd Int. Conf. on Ground Movement and Structures, Cardiff, Pentech Press, London, England, 145–160.
10.
Parker, J. C., Kool, J. B., and van Genuchten, M. T. (1985). “Determining soil hydraulic properties from one‐step outflow experiments by parameter estimation: II. Experimental studies.” Soil Sci. Soc. Am. J., 49(6), 1354–1359.
11.
Richards, L. A. (1931). “Capillary conduction of liquids through porous mediums.” Physics., 1, 318–333.
12.
Scott Russell, R. (1975). Plant root systems—Their function and interaction with the soil. McGraw‐Hill, London, England.
13.
Sim, K. G. (1982). “A finite element analysis of water flow in a partially saturated soil” thesis presented to the University of Wales, at Cardiff, Wales, in partial fulfillment of the requirements for the degree of Master of Science.
14.
"Soils for civil engineering purposes.” (1975). BS1377. British Standards Instn., London, England.
15.
Thomas, H. R., and Owen, R. C. (1989). “A simulation of seasonal temperature and moisture content changes in the ground.” Communications in Appl. Numer. Methods, 5(3), 171–179.
16.
van Genuchten, M. T. (1980). “A closed‐form equation for predicting the hydraulic conductivity of unsaturated soils.” Soil Sci. Soc. Am. J., 44(5), 892–898.
17.
Zienkiewicz, O. C., and Taylor, R. L. (1989). The finite element method. Vol. 1, Fourth Ed., McGraw‐Hill Book Company, London, England.
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Published In
Journal of Geotechnical Engineering
Volume 116 • Issue 10 • October 1990
Pages: 1483 - 1500
Copyright
Copyright © 1990 ASCE.
History
Published online: Oct 1, 1990
Published in print: Oct 1990
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