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- W2516270256 abstract "Soil solute transport parameters are usually measured at the pedon scale, but predictions of transport at the polypedon scale are often required. Our objectives were to compare pedon- and polypedon-scale convection dispersion equation (CDE) transport parameters measured in a field leaching experiment and to compare deterministic and stochastic predictions of polypedon-scale transport. The study was conducted near Watkinsville, Ga. on a 12.5 by 30.5 m plot. Time domain reflectometry (TDR) waveguides (30 and 60 cm in length) were installed vertically at 80 locations to measure water content and impedance. The plot was irrigated and a CI pulse was used as a tracer. We found vcry good agreement betwcen the average CDE parameters measured at the pedon scale and those estimated at the polypedon scale in the 0-30 and 0-60 cm depth intervals. Although the variability in average pore velocities bctwecn pedons was large, the variability in velocities within a pedon causcd by hydrodynamic dispersion was greater. As a result, a deterministic approach based on the CDE more accurately predicted the estimated polypedon scale breakthrough curve (BTC) at 30 and 60 cm depths than a stochastic approach based on the convective lognormal transfer function (CLT). This indicates that the pedon serves as a representative elementary volume (REV) for solute transport in this soil." @default.
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- W2516270256 date "1998-01-01" @default.
- W2516270256 modified "2023-09-27" @default.
- W2516270256 title "Solute transport at the pedon and polypedon scales" @default.
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