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Abstract:

We made a study in the backyard of an agrochemical plant using a small-loop, frequency-domain electromagnetic induction (EMI) system. Such systems are very sensitive to conductive structures buried at shallow depths. Frequently, they are only used to locate and delimit these structures by direct observation of data. However, much more information can be obtained by applying numerical modeling techniques to the data. First we mapped an anomalous zone that indicates the possible presence of buried waste or some other underground contamination by visualizing data. Then we applied a 1D inversion method to the data from this zone. By joining 1D inversion results, this method builds 2D images of the subsoil structure below survey lines. Because the code applies smoothness constraints to the 1D inversions, the subsoil properties in these 2D images change gradually with depth. The code does not impose any correlation between the data or 1D models corresponding to neighboring points, so sharp lateral changes can appear. Several of them do not represent real features of the subsoil. We designed and applied two spatial filters to smooth the spurious lateral variations in our models. One correlates the data acquired at adjacent points prior to inversions. The other applies an analogous correlation to the inverse models obtained from the original data. Both filters greatly improve the quality of the 2D images. Compiling these results, we obtained a 3D model of the subsoil that characterizes the anomalous structure. Excavations made later at the site confirmed the results. © 2008 Society of Exploration Geophysicists. All rights reserved.

Registro:

Documento: Artículo
Título:Laterally filtered 1D inversions of small-loop, frequency-domain EMI data from a chemical waste site
Autor:Martinelli, P.; Duplaá, M.C.
Filiación:CONICET (Consejo Nacional de Investigaciones Científicas y Técnicas), Buenos Aires, Argentina
ANPCyT (Agencia Nacional de Promoción Científica Tecnológica), Buenos Aires, Argentina
Universidad de Buenos Aires, Departamento de Física, Facultad de Ciencias Exactas y Naturales, Buenos Aires, Argentina
Palabras clave:Electromagnetic induction; Numerical models; Soils; Direct observations; Electromagnetic inductions (EMI); Frequency domains; Lateral variations; Modeling technique; Neighboring point; Smoothness constraints; Spatial filters; Frequency domain analysis; data acquisition; data inversion; electromagnetic method; excavation; inverse problem; numerical model; one-dimensional modeling; smoothing; visualization; wasteland
Año:2008
Volumen:73
Número:4
Página de inicio:F143
Página de fin:F149
DOI: http://dx.doi.org/10.1190/1.2917197
Título revista:Geophysics
Título revista abreviado:Geophysics
ISSN:00168033
CODEN:GPYSA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00168033_v73_n4_pF143_Martinelli

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Citas:

---------- APA ----------
Martinelli, P. & Duplaá, M.C. (2008) . Laterally filtered 1D inversions of small-loop, frequency-domain EMI data from a chemical waste site. Geophysics, 73(4), F143-F149.
http://dx.doi.org/10.1190/1.2917197
---------- CHICAGO ----------
Martinelli, P., Duplaá, M.C. "Laterally filtered 1D inversions of small-loop, frequency-domain EMI data from a chemical waste site" . Geophysics 73, no. 4 (2008) : F143-F149.
http://dx.doi.org/10.1190/1.2917197
---------- MLA ----------
Martinelli, P., Duplaá, M.C. "Laterally filtered 1D inversions of small-loop, frequency-domain EMI data from a chemical waste site" . Geophysics, vol. 73, no. 4, 2008, pp. F143-F149.
http://dx.doi.org/10.1190/1.2917197
---------- VANCOUVER ----------
Martinelli, P., Duplaá, M.C. Laterally filtered 1D inversions of small-loop, frequency-domain EMI data from a chemical waste site. Geophysics. 2008;73(4):F143-F149.
http://dx.doi.org/10.1190/1.2917197