2. Numerical Simulations of Water Flow and Solute Transport Applied to Acid Sulfate Soils
This article is a reply.
VIEW THE ORIGINAL ARTICLEPublication: Journal of Irrigation and Drainage Engineering
Volume 128, Issue 2
Abstract
Field investigations of Rassam et al. in 2001 have highlighted the effects of infiltration, drainage, and evapotranspiration on the dynamics of water flow and solute transport in acid sulfate (AS) soils. In this work, HYDRUS-2D is adopted as the modeling tool to elucidate the trends observed in that field experiment. Hypothetical simulations have shown that the relative contribution of drains to lowering the water table is significant only when closely spaced drains are installed in coarse textured soils, evapotranspiration being the main driving force in all other cases. AS soils reaction products that are close to a drain are readily transportable during infiltration and early drainage, but those produced farther away from it near the midpoint between drains are only slowly transported during a prolonged drainage process. Simulating the field trial of Rassam et al. has shown that drain depth and evapotranspiration significantly affect solute fluxes exported to the ecosystem. Managing AS soils should target minimal drain depth and density. Partial or full lining of the drains should be considered as a management option for ameliorating the environmental hazards of AS soils.
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References
Ayars, J. E., Grismer, M. E., and Guitjens, J. C.(1997). “Water quality as design criterion in drainage water management systems.” J. Irrig. Drain Eng., 123(3), 154–158.
Cook, F. J., Suzuki, M. M., Gardner, E. A., and Rayment, G. E. (1998). “Measurement and modelling of acid sulphate soils used for sugar cane production.” Proc., Australian Society of Sugar Cane Technologies, The Australian Society of Sugar Cane Technologists, Australia, 20, 550.
Feddes, R. A., Kowalik, P. J., and Zaradny, H. (1978). “Simulation of field water use and crop yield.” Simulation monographs, Pudoc, Wageningen, The Netherlands.
Grismer, M. E. (1989). “Drainage efficiency and drain water quality.” Proc., 11th Int. Congress on Agricultural Engineering, V. A. Dodd and P. M. Grace, eds., Balkema, Rotterdam, 285–290.
Grismer, M. E.(1993). “Subsurface drainage system design and drain water quality.” J. Irrig. Drain Eng., 119(3), 537–543.
Mualem, Y.(1976). “A new model for predicting the hydraulic conductivity of unsaturated porous media.” Water Resour. Eng., 12, 513–522.
Rassam, D. W., Cook, F. J., and Gardner, E. A.(2002). “1. Field and laboratory studies of acid sulphate soils.” J. Irrig. Drain Eng., 128(2), 100–106.
Simunek, J., Vogel, T., and van Genuchten, M. Th. (1994). “TheSWMS-2D code for simulating water flow and solute transport in two-dimensional variably saturated media.” Res. Rep., U.S. Salinity Lab., Agriculture Res. Service, U.S. Dept. of Agriculture, Riverside, Calif.
Schaap, M. G., Leig, F. J., and van Genuchten, M. Th. (2001). “Rosetta: a computer program for estimating soil hydraulic parameters with hierarchical pedotransfer functions.” J. Hydrology, in press.
Van der Molen, W. H., and Wesseling, J.(1991). “A solution in closed form and a series solution to replace the tables for the thickness of an equivalent layer in Hooghoudt’s drain spacing formula.” Agric. WaterManage., 19, 1–16.
van Genuchten, M. Th.(1980). “A closed-form equation for predicting the hydraulic conductivity of unsaturated soils.” Soil Sci. Soc. Am. J., 44, 892–898.
White, I., Wilson, B. P., Melville, M. D., Sammut, J., and Lin, C. (1996). “Hydrology and drainage of acid sulphate soils.” Proc., 2nd National Conf. on Acid Sulphate Soils, Robert J. Smith and Associates, NSW, Australia, 103–108.
Youngs, E. G.(1985). “A simple drainage equation for predicting water table drawdowns.” J. Agric. Eng. Res., 31, 321–328.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 128 • Issue 2 • April 2002
Pages: 107 - 115
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Jan 24, 2001
Accepted: Sep 11, 2001
Published online: Apr 1, 2002
Published in print: Apr 2002
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