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United States Department of Agriculture

Agricultural Research Service

Title: FIELD-SCALE MONITORING AND SIMULATION OF THE OVERLAND TRANSPORT OF BROMIDE AND PATHOGENS)

Author
item Roodsari, Reza
item Shirmohammadi, A.
item Shelton, Daniel
item Pachepsky, Yakov
item Sadeghi, Ali
item Starr, James

Submitted to: Abstract of Agronomy Meetings
Publication Type: Abstract Only
Publication Acceptance Date: 8/28/2002
Publication Date: 11/1/2002
Citation: Roodsari, R., Shirmohammadi, A., Shelton, D.R., Pachepsky, Y.A., Sadeghi, A.M., Starr, J.L. 2002. Field-scale monitoring and simulation of the overland transport of bromide and pathogens. Abstract of Agronomy Meetings. p.178.

Interpretive Summary:

Technical Abstract: A two-side lysimeter with 20% slopes was instrumented to monitor the surface and vertical transport of pathogens. Each side of the lysimeter was divided into sub-plots (6.7 m x 7.3 m), one with grass and the other bare soil. Runoff samples were collected at three equidistant transects along the slope and a gutter at the edge of each plot. All plots were equipped with multi-sensor moisture probes to monitor real-time water content through the soil profile. Bovine manure with added bromide was applied at the top of the slope of each plot in 30-cm strips. Rainfall was simulated at 60 mm/hr, surface flow was measured and sampled at five minute intervals. Soil samples were taken at incremental depths (0-50 cm) after rain simulations. Runoff and soil samples were analyzed for fecal coliform (FC) bacteria. FC data indicate that while 100% of the initial population could be lost to runoff from bare plots, only 1% of the initial population was lost from vegetated plots. FC concentrations decreased with distance along the slope. Results also show that bare plots offered no resistance to surface flow; FC were detected in total runoff at gutter within 10 minutes of rainfall initiation. Kinematic wave model successfully simulated overland flow of both bromide and FC.

Last Modified: 05/27/2017
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