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Bibliography

U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Colorado Springs, Colorado, September 20-24, 1993, Water-Resources Investigations Report 94-4015

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Unsaturated Zone Transport at the Plains, Georgia Field Site

by

D.D. Bosch (U.S. Department of Agriculture, Agricultural Research Service, Southeast Watershed Research Laboratory, Tifton, Georgia 31793), R.A. Leonard (U.S. Department of Agriculture, Agricultural Research Service, Southeast Watershed Research Laboratory, Tifton, Georgia 31793), and R.K. Hubbard (U.S. Department of Agriculture, Agricultural Research Service, Southeast Watershed Research Laboratory, Tifton, Georgia 31793)

Abstract

Soil-water and solute-transport data have been collected over three years on a 0.81 ha field site located near Plains, Georgia. Soil cores collected from the root and vadose zone show extreme variability in movement and transport of applied bromide (Br-) tracer. The Groundwater Loading Effects of Agricultural Management Systems - Finite Element Solute Transport (GLEAMS- FEST) root-vadose zone model was used to simulate Br- transport below the site. Comparison of simulated concentrations to horizontally averaged profile concentrations show good agreement for year one but poor agreement thereafter, probably due to inaccurate estimates of hydraulic parameters in deeper parts of the vadose zone. Because of extreme variability in transport data, profile-averaged concentrations may not be a realistic representation of the sample data.

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