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Application of a Darcian Approach to Estimate Liquid Flux in a Deep Vadose Zone

^a Idaho National Engineering and Environmental Laboratory, Geosciences Research Department, P.O. Box 1625, MS 2107, Idaho Falls ID 83415
^b Geosciences Dep., Univ. of Nevada, Las Vegas, NV 89122

View larger version (29K): [in a new window]   Fig. 1. Location map of the Eastern Snake River Plain (ESRP), Idaho National Engineering and Environmental Laboratory (INEEL), and Subsurface Disposal Area (SDA).

View larger version (40K): [in a new window]   Fig. 2. East–west cross section across the study area. Surficial sediment and interbeds comprise 5% of the total thickness of the material to the water table at 180 m. Wells 01, 02, 03, and 07 are projected north–south onto the cross section. (See Fig. 3 for well locations.)

View larger version (33K): [in a new window]   Fig. 3. Map of well locations in and around the SDA, with measured water potential shown as inserts. For presentation, the 30-mo-long data streams were subsampled at 12-h intervals. Well names indicate the tensiometer depth in meters (i.e., Well I1-69 has a tensiometer located at 69 m bls).

View larger version (27K): [in a new window]   Fig. 4. Soil textural triangle. Grain size analyses of the <2-mm fraction are used to place sediment samples into textural categories ranging from silty clay loam to loamy sand.

View larger version (17K): [in a new window]   Fig. 5. Flux estimates from the (a) 34-m and (b) 73-m interbeds. The horizontal bars represent the range of water potentials measured at a given site, with the solid dot placed at the mean. The vertical bars represent the range of K() estimated from those values. The dashed lines represent the generic curves developed by Magnuson and McElroy (1993).

View larger version (29K): [in a new window]   Fig. 6. Temporal changes in water potential and estimated flux for Wells (a) O4-33, O-69, and (b) I1-69.