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Title: TWO-DIMENSIONAL REPRESENTATION AND MODELING OF BROMIDE AND FECAL COLIFORM TRANSPORT WITH RUNOFF AND INFILTRATION

Author
item KOUZNETSOV, M - BEN GURION UNIVERSITY
item Shelton, Daniel
item Pachepsky, Yakov
item ROODSARI, REZA - UNIVERSITY OF MARYLAND
item SHIRMOHAMMADI, A - UNIVERSITY OF MARYLAND
item Sadeghi, Ali
item Starr, James

Submitted to: American Society of Agronomy Meetings
Publication Type: Abstract Only
Publication Acceptance Date: 6/1/2003
Publication Date: 11/2/2003
Citation: Kouznetsov, M.Y., Shelton, D.R., Pachepsky, Y.A., Roodsari, R., Shirmohammadi, A., Sadeghi, A.M., Starr, J.L. 2003. Two-dimensional representation and modeling of bromide and fecal coliform transport with runoff and infiltration. [Abstract]. American Society of Agronomy Meetings. November 2-6,2003, Denver, Co. p.184.

Interpretive Summary:

Technical Abstract: Manure-borne pathogens partition between overland flow and infiltration during surface transport of manures. The objective of this work was to develop and test a mechanistic model of coupled surface and subsurface flow and transport of fecal bacteria and a conservative tracer at a runoff plot scale. The testing should (a) indicate what additional complexity and observations might be needed to capture essential processes in the model, and (b) show how difficult is to provide spatially variable values of transport parameters. We combined the three-dimensional FEMFLOW model of saturated-unsaturated subsurface flow with the Saint-Venant model for runoff. Results were visualized in the GMS environment. The model was tested with earlier reported data on fecal coliform and bromide transport on vegetated and bare plots. Manure was applied in a 30-cm strip on the top of 6-m long 20 % slopes and rainfall was simulated for 1-2 hours. Large variability in transport within the slope was encountered that could be simulated with up to 50 parameters found from the solution of inverse problem. Reduction of the system to the two-dimensional representation gave much smoother and more comprehensible dataset that could be simulated with smaller number of transport parameters while retaining the main features of vegetated filter strips that minimize pathogen transport to surface water.