Land subsidence is the act of land moving downward, or subsiding. In many cases, land subsidence can signify the formation of a sinkhole, which you can read about in this article. Land subsidence could also signify the presence of an expansive clay.
One way that sinkholes form is when water in the atmosphere reacts with carbon dioxide and forms a weak carbonic acid. As the slightly acidic rainwater moves through fissures in the limestone, it begins to dissolve and widens the fissures—which eventually creates air or water filled pockets. When those pockets become expansive, they’re called “caves” or “voids.” This is a common natural phenomenon in limestone or dolomite known as karstification—but it can be dangerous, expensive, and life-threatening when the ceiling of a void weakens and caves in. This is known as a “sinkhole.”
At the most basic level, electrical resistivity (ER) (as used in geophysics) is the measurement of ground variations gathered by applying a small and highly controlled electric current across an array of electrodes.
Electrical resistivity imaging (ERI)—also known as electrical resistivity tomography (ERT)—is a geophysical technique used to create an image of a specific portion of the Earth’s subsurface. It is created through the use of automated geophysical instruments that gather thousands of resistivity measurements via an electrode cable and multiple electrodes.
Resistivity and IP (Induced Polarization) Inversion Processing
Constable, S., Parker, R.L., and Constable, C.G., 1987, Occam’s inversion: A practical algorithm for generating smooth models from electromagnetic sounding data, Geophysics, 52, 289-300.
DeGroot-Hedlin, D. and Constable, S., 1990, Occam’s inversion to generate smooth, two-dimensional models from magnetotelluric data, Geophysics, 55, 1613-1624.
Manual cable sets are AWG 18 stranded copper wire with thermoplastic insulation and a nylon sheath, terminated with banana plug and banana plug socket located in the hub of the reel.
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Este video explica cómo hacer diferentes arreglos de resistividad para el Instrumento de Imágenes de Resistividad SuperSting.
Arreglos Clásicos de Imágenes de Resistividad:
Estudio de Resistividad 1D
Un estudio donde los cambios de resistividad son resueltos
solamente en la dirección vertical. En muchos casos, es asumido un suelo estratificado
en capas horizontales.Sondeos eléctricos verticales son un ejemplo de un estudio 1D.
Estudio de Resistividad 2D
Un estudio donde los electrodos son instalados a lo largo de un