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Assessment of contamination by intensive cattle activity through electrical resistivity tomography

Por: Sainato, Claudia Mabel. Cátedra de Física, Facultad de Agronomía, Av. San Martín 4453 (1417DSE), Buenos Aires, Argentina. csainato@agro.uba.ar.
Colaborador(es): Losinno, Beatriz Norma [Cátedra de Física, Facultad de Agronomía, Av. San Martín 4453 (1417DSE), Buenos Aires, Argentina.losinno@agro.uba.ar] | Malleville, Horacio Jorge [Cátedra de Física, Facultad de Agronomía, Av. San Martín 4453 (1417DSE), Buenos Aires, Argentina.mallevil@agro.uba.ar].
ISSN: 0926-9851.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): ELECTRICAL RESISTIVITY TOMOGRAPHY | FEEDLOTS | CONTAMINATION | ELECTRICAL CONDUCTIVITY | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR En: Journal of applied geophysics vol.76 (2012), 82–91, il., tbls., grafs., fot., mapasResumen: The intensive animal production is considered highly risky for groundwater and soil because of high mobility of some contaminants from animal wastes. The aim of this work was to obtain an electrical conductivity image of unsaturated and saturated zones at a feedlot (cattle feeding field) at the surroundings of Buenos Aires city (Argentina) in order to detect the most critical sectors of the field, with regard to contamination by animal wastes. Dipole–dipole electrical soundings (electrical resistivity tomography) were performed at the corral zone and the surroundings. 2D and 3D models of conductivity were obtained. Even if there is a calcareous plate below some parts of the corrals and soil compaction is high, vertical infiltration or subsurface runoff may have occurred since these sites, with high animal charge, show soil conductivities higher than the surroundings. The models showed higher conductivities of saturated zone increasing in the direction of groundwater flow. These results were taken into account for further designs of soil and groundwater sampling. Groundwater conductivity was three times greater downgradient from the corrals with high concentrations of nitrates and phosphorous. A zone of high conductivity was found below a small channel of effluents from the corrals.
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The intensive animal production is considered highly risky for groundwater and soil because of high mobility of some contaminants from animal wastes.
The aim of this work was to obtain an electrical conductivity image of unsaturated and saturated zones at a feedlot (cattle feeding field) at the surroundings of Buenos Aires city (Argentina) in order to detect the most critical sectors of the field, with regard to contamination by animal wastes. Dipole–dipole electrical soundings (electrical resistivity tomography) were performed at the corral zone and the surroundings.
2D and 3D models of conductivity were obtained. Even if there is a calcareous plate below some parts of the corrals and soil compaction is high, vertical infiltration or subsurface runoff may have occurred since these sites, with high animal charge, show soil conductivities higher than the surroundings. The models showed higher conductivities of saturated zone increasing in the direction of groundwater flow. These results were taken into account for further designs of soil and groundwater sampling.
Groundwater conductivity was three times greater downgradient from the corrals with high concentrations of nitrates and phosphorous. A zone of high conductivity was found below a small channel of effluents from the corrals.

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