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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

Authors
item Roodsari, Reza - UNIVERSITY OF MD
item Shirmohammadi, A. - UNIVERSITY OF MD
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: August 28, 2002
Publication Date: November 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.

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: 8/22/2014
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