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ABSTRACT
Before the Richards equation can be used to simulate the flow of moisture through a soil it is necessary to estimate the water capacity and hydraulic conductivity functions which appear as coefficients. We present four parameter identification methods and one direct method for estimating these hydraulic properties. For the sample problem considered, the parameter identification method which used cumulative discharge data to estimate water capacity and hydraulic conductivity performed the best in predicting water content as a function of depth and time during drainage.
1 Contribution from Colorado State University, Fort Collins, CO 80523, and from the USDA-ARS. This paper contains results of work carried out with the support of NSF Grant Eng-78-3227.
2 Associate Professor of Math., Colorado State Univ.; Professor of Math., Colorado State Univ.; and Professor of Agron, and Soil Scientist, USDA-ARS, respectively.
Received for publication October 23, 1980. Accepted for publication July 16, 1981.
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