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Estimating Soil Hydraulic Parameters of a Field Drainage Experiment Using Inverse Techniques

Pacific Northwest National Laboratory, Hydrology Group, MSIN K9-33, P.O. Box 999, Richland, WA 99352

View larger version (26K): [in a new window]   Fig. 1. The composite scaled sensitivities ratio () of water flow to the changes in the hydraulic parameters using (a) only , (b) only h, and (c) and h observations.

View larger version (28K): [in a new window]   Fig. 2. The two-dimensional response surfaces in the log(Ks)– log() planes using (a) only , (b) only h, and (c) and h observations. Parameter Ks is in centimeters per hour, and is per centimeter.

View larger version (40K): [in a new window]   Fig. 3. Comparisons between the observed and the simulated values using the parameter values determined by different methods. The plot numbers are corresponding to Methods 1 through 5, and the parameter values are listed in Table 2.

View larger version (23K): [in a new window]   Fig. 4. The contours of the 1%-scaled sensitivity of water content (10-5 m3 m-3) to changes in (a) Ks, (b) , (c) n, (d) s, and (e) r in the t–z planes.

View larger version (28K): [in a new window]   Fig. 5. The contours of the 1%-scaled sensitivity of pressure head (10-4 m) to changes in (a) Ks, (b) , (c) n, (d) s, and (e) r in the t–z planes.