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Evaluation of a Simple Method for Estimating Solute Transport Parameters

Laboratory Studies

^a Dep. of Agronomy, Iowa State Univ., Ames, IA 50011 USA
^b USDA-ARS, National Soil Tilth Lab., 2150 Pammel Dr., Ames, IA 50011 USA

View larger version (16K): [in a new window]   Fig. 1 (a) Breakthrough curves (BTCs) of the four different tracers for the column D1. (b) The BTCs adjusted so that t = 0 when each tracer was first applied to the column D1

View larger version (24K): [in a new window]   Fig. 2 Resident concentration of the four different tracers at end of leaching in the column D1

View larger version (18K): [in a new window]   Fig. 3 The resident concentrations in the upper four layers for the column D1 plotted as ln(1-C/C0) vs. application time and regression lines fitted to the data using Eq. [4]

View larger version (22K): [in a new window]   Fig. 4 Comparison of the estimated and im values of the breakthrough curve (BTC) method and the Jaynes et al. (1995) method. The best fit value and 95% confidence interval are plotted for the BTC method, and four independent estimates from two to five soil layers using the Jaynes et al. (1995) method are plotted

View larger version (22K): [in a new window]   Fig. 5 (a), (b). Measured and predicted breakthrough curves (BTCs) for columns B2 and D2. The circles are the measured breakthrough data (first applied tracer), and the lines represent calculated BTCs. The predicted BTCs use the analytical solution and and im values estimated from resident concentrations

View larger version (25K): [in a new window]   Fig. 6 Measured and calculated resident concentrations. The calculated curves are obtained using parameters estimated from measured outflow data