Monday, 7 November 2005
18

This presentation is part of: Symposium--Water and Chemical Fluxes from the Pore to Landscape Scale: III

Quantifying a Shallow Groundwater Leachate Flux in a Non –Tilled Drained System.

Timothy Gish, King-Jau Kung, Craig S. Daughtry, Tammo S. Steenhuis, Eileen Kladivko, Thomas J. Nicholson, and Ralph E. Cady.

To accurate quantify solute transport, determine relevance or develop theory to accurately describe chemical behavior, it is crucial to first quantitatively determine a total solute flux, including preferential flow. A protocol extending a flux method previously developed for tile-drained systems was tested for shallow ground water systems without a tile drain. Bromide was surface broadcast applied around three shallow observation wells and irrigated at 4.1 mm/h. Throughout the study the water table height, soil moisture profiles were continuously monitored along with water flows from pumped observation wells. The bromide flux monitored represented a treated soil area of about 30 m2 per well. Results indicated that: 1) about 98 percent of the applied bromide tracer was recovered; 2) at 4.1 mm/h over half of the surface-applied bromide was recovered at a depth of 1.6 m after only 280 mm of irrigation; and 3) at this location, bromide fluxes were dominated by preferential flow when subjected to a 4.1 mm/h irrigation rate. Preliminary results suggest this protocol may be a useful tool for quantifying solute transport fluxes in non tile-drained systems that contain a shallow groundwater system.


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