464 
ACKNOWLEDGEMENTS 
We thank Dr. P. A. Troch for his suggestive comments and help on the implementation of the 
hydrologic model. This study was supported by NASA Global Change Graduate Fellowship (NGT- 
30049), NASA Grant NAG5-1628 and USDA Cooperative Agreement 58-3K47-0-039 for application 
of SIR-C Synthetic Aperture Radar to Hydrology. Support from NASA and USDA is highly appre 
ciated. 
REFERENCES 
Anderson, B. D. 0. and J. B. Moore, 1979, Optimal Filtering , Prentice-Hall, Englewood Cliffs, NJ. 
Beven, K. J., 1982, On Subsurface Stormflow: An Analysis of Response Times, Hydrol. Sci. J., 27. 
505-521. 
Brook, R. H. and A. T. Corey, 1964, Hydraulic Properties of Porous Media , Hydrology Papers, no. 
3, Colorado State Univ., Fort Collins, CO. 
Burrough, P. A., 1986, Principles of Geographical Information System for Land Resources Assess 
ment, Chap. 3, Oxford Press, New York. 
Crank, J., 1975, The Mathematics of Diffusion, 2nd ed., Oxford University Press, New York. 
Eagleson, P. S., 1978, Climate, Soil, and Vegetation 3. A Simplified Model of Soil Moisture Move 
ment in the Liquid Phase , Water Resour. Res., 14, 722-730. 
Engman, E. T., 1990, Progress in Microwave Remote Sensing of Soil Moisture, Cana. J. Remote 
Sensing, 16, 6-14. 
Famiglietti, J. S., 1992, Aggregation and Scaling of Spatially-Variable Hydrological Processes: Local, 
Catchment-Scale and Macroscale Models of Water and Energy Balance, Ph.D. thesis, Princeton Uni 
versity. 
Ibrahim, H. A. and W. Brutsaert, 1968, Intermittent Infiltration into Soils with Hysteresis, J. Hy- 
draul. Eng., 94, 113-137. 
Jackson, T. J., 1992, Measuring Surface Soil Moisture Using Passive Microwave Remote Sensing, 
Hydrological Processes, 7. 
Lin, D. S., E. F. Wood, M. Mancini, P. Troch and T. J. Jackson, 1993, Comparisons between Re 
motely Sensed and Model Simulated Soil Moisture on a Heterogeneous Watershed, Remote Sensing 
Environ., in press. 
Loague, K.M., and Freeze R.A., 1985. A Comparison of Rainfall-Runoff Modelling Techniques on 
Small Upland Catchments, Water Resour. Res., 21, 229-248. 
Milly, P. C. D., 1986, An Event-Based Simulation Model of Moisture and Energy Fluxes at a Bare 
Soil Surface, Water Resour. Res., 22, 1680-1692. 
Philip, J. R., 1957, The Theory oof Infiltration, \, Sorptivity and Algebraic Infiltration Equations, 
Soil Sci., 84, 256-264. Salvucci, G. D., 1993, An Approximate Solution for Steady Vertical Flux of 
Moisture Through an Unsaturated Homogeneous Soil, Water Resour. Res., 29, 3749-3754. 
Sivapalan, M., K. Beven, and E. F. Wood, 1987, On Hydrologic Similarity 2. A Scaled Model of 
Storm Runoff Production, Water Resour. Res., 23, 2266-2278. 
Troch, P. A., F. P. De Troch and W. Brutsaert, 1993a, Effective Water Table Depth to Describe Ini 
tial Conditions Prior to Storm Rainfall in Humid Regions, Water Resour. Res, 29, 427-434. Troch, 
P., M. Mancini, E. F. Wood and C. Paniconi, 1993b. Evaluation of a Distributed Catchment Scale 
Water Balance Model, Water Resour. Res., 29, 1805-1817. 
Wood, E. F., D. S. Lin, M. Mancini, D. Thongs, P. A. Troch, T. J. Jackson, J. S. Famiglietti and 
E. T. Engman, 1993, Intercomparisons Between Passive and Active Microwave Remote Sensing and 
Hydrological Modeling for soil Moisture, Adv. Space Res., 13, 167-176.