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Published in Soil Sci Soc Am J 43:434-439 (1979)
© 1979 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Physical Model of the Hydrology of Sloping Heterogeneous Fields1

D. Hillel2 and G. M. Hornberger3

ABSTRACT

A model simulating water flow and storage in a 2-dimensional section of a sloping field, in which surface runoff, infiltration, evaporation, unsaturated soil moisture movement and ground-water flow are represented as a series of interacting 1-dimensional processes, was adapted to cases of horizontally heterogeneous fields. The model is illustrated in a series of simulation trials with variously constituted hypothetical fields of loam and clay soils, subjected to a 108-mm rainstorm. Runoff was found to depend on the fraction of the slope occupied by clay, and on the relative location of the clay (whether upslope or downslope with respect to the loam). Ground-water recharge was found to be greater in the loam, as was the rate of lateral drainage. The capability of the model is discussed.

NOTES

1 Paper no. 2199, Massachusetts Agric. Exp. Stn., Univ. of Massachusetts at Amherst. This research supported (in part) from Experiment Station Project no. 425. Acknowledgement is also made to the Water Resources Research Center of the Virginia Polytechnic Inst., Blacksburg, Va, for supporting earlier stages of this research.

2 Dept. of Plant & Soil Sciences, Univ. of Massachusetts, Amherst, MA 01003.

3 Dept. of Environ. Sciences, Univ. of Virginia, Charlottesville, VA 22903.

Received for publication January 30, 1978. Accepted for publication January 24, 1979.






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