Theoretical Developments in Electromagnetic Induction Geophysics with Selected Applications in the Near Surface

Everett, Mark E.

doi:10.1007/s10712-011-9138-y

Cited by 82 publications

(33 citation statements)

References 84 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These studies open for fast data acquisition combined with precise positioning by GPS, providing interesting possibilities for archaeological prospecting. The use of EMI methods has also been increased use outside the archeological community, especially for geotechnical applications and agricultural uses [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Improved Geoarchaeological Mapping with Electromagnetic Induction Instruments from Dedicated Processing and Inversion

et al. 2016

View full text Add to dashboard Cite

Increasingly, electromagnetic induction methods (EMI) are being used within the area of archaeological prospecting for mapping soil structures or for studying paleo-landscapes. Recent hardware developments have made fast data acquisition, combined with precise positioning, possible, thus providing interesting possibilities for archaeological prospecting. However, it is commonly assumed that the instrument operates in what is referred to as Low Induction Number, or LIN. Here, we detail the problems of the approximations while discussing a best practice for EMI measurements, data processing, and inversion for understanding a paleo-landscape at an Iron Age human bone depositional site (Alken Enge) in Denmark. On synthetic as well as field data we show that soil mapping based on EMI instruments can be improved by applying data processing methodologies from adjacent scientific fields. Data from a 10 hectare study site was collected with a line spacing of 1-4 m, resulting in roughly 13,000 processed soundings, which were inverted with a full non-linear algorithm. The models had higher dynamic range in the retrieved resistivity values, as well as sharper contrasts between structural elements than we could obtain by looking at data alone. We show that the pre-excavation EMI mapping facilitated an archaeological prospecting where traditional trenching could be replaced by a few test pits at selected sites, hereby increasing the chance of finding human bones. In a general context we show that (1) dedicated processing of EMI data is necessary to remove coupling from anthropogenic structures (fences, phone cables, paved roads, etc.), and (2) that carrying out a dedicated full non-linear inversion with spatial coherency constraints improves the accuracy of resistivities and structures over using the data as they are or using the Low Induction Number (LIN) approximation.

show abstract

Section: Introductionmentioning

confidence: 99%

Improved Geoarchaeological Mapping with Electromagnetic Induction Instruments from Dedicated Processing and Inversion

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Electromagnetic induction instruments are used in a wide variety of fields from hydrogeology and agriculture to archeology and contaminant transport (Everett, 2011). Investigations seeking to extract hydrogeologic information in arid environments tend to experience less interference from soil moisture and salinity during dry periods (Callegary and others, 2007a), such as the period immediately prior to the pulse flow.…”

Section: Electromagnetic Induction Datamentioning

confidence: 99%

Geophysical data collected during the 2014 minute 319 pulse flow on the Colorado River below Morelos Dam, United States and Mexico

Kennedy¹,

Callegary²,

Macy³

et al. 2017

Open-File Report

View full text Add to dashboard Cite

For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment-visit http://www.usgs.gov/ or call 1-888-ASK-USGS (1-888-275-8747).For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprod/.Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner.Suggested citation: Kennedy, J.R., Callegary, J.B., Macy, J.P., Reyes-Lopez, J., Pérez-Flores, M., 2017, Geophysical data collected during the 2014 minute 319 pulse flow on the Colorado River below Morelos Dam, United States and Mexico: U.S. Geological Survey Open-File Report 2017-1050, 48 p., https://doi.org/10.3133/ofr20171050. ISSN 2331ISSN -1258 iii AcknowledgmentsMany parties contributed to this data-collection effort. The overall project was administered by the International Boundary and Water Commission and the Comisión Internacional de Límites y Aguas. Extensive support was provided by the U.S. Bureau of Reclamation, the U.S. Geological Survey Arizona Water Science Center's Yuma Field Office, and the U.S. Geological Survey Southwest Region office. Jeff Milliken at the U.S. Bureau of Reclamation was instrumental in obtaining the lidar and inundation data used in the analysis of gravity data. Geoff DeBenedetto, Matt Garcia, Eloise Kendy, Colin Kikuchi, Kristen Landrum, Michael Landrum, Fernando Herrera, Agustín Oropeza, and Gricel Xancal assisted with fieldwork. Additional volunteer assistance from The Nature Conservancy is gratefully acknowledged. Conversion Factors AbstractGeophysical methods were used to monitor infiltration during a water release, referred to as a "pulse flow," in the Colorado River delta in March and April 2014. The pulse flow was enabled by Minute 319 of the 1944 United States-Mexico Treaty concerning water of the Colorado River. Fieldwork was carried out by the U.S. Geological Survey and the Centro de Investigación Científica y de Educación Superior de Ensenada as part of a binational effort to monitor the hydrologic effects of the pulse flow along the limitrophe (border) reach of the Colorado River and into Mexico. Repeat microgravity measurements were made at 25 locations in the southern limitrophe reach to quantify aquifer storage change during the pulse flow. Observed increases in storage along the river were greater with distance to the south, and the amount of storage change decreased away from the river channel. Gravity data at four monitoring well sites indicate specific yield equal to 0.32±0.05. Electromagnetic induction methods were used at 12 transects in the limitrophe reach of the river along the United StatesMexico border, and farther south into Mexico. These data, which are sensit...

show abstract

“…Despite the spreading use of multiple-frequency and multiple-coil EMI instruments compared to the classic twin-coil configuration, a way to overcome this issue is, at least to constrain, and at best to calibrate multilayer inversion of EMI measurements against ERI (electrical resistivity imagery) profiling. A very large body of scientific literature has been published on the study and use of near-surface electromagnetic geophysics, especially in the frequency domain, as described by Everett (2012).…”

Section: Introductionmentioning

confidence: 99%

Multiconfiguration electromagnetic induction survey for paleochannel internal structure imaging: a case study in the alluvial plain of the River Seine, France

Réjiba

Schamper

Chevalier

et al. 2018

Hydrol. Earth Syst. Sci.

View full text Add to dashboard Cite

Abstract. The La Bassée floodplain area is a large groundwater reservoir controlling most of the water exchanged between local aquifers and hydrographic networks within the Seine River basin (France). Preferential flows depend essentially on the heterogeneity of alluvial plain infilling, whose characteristics are strongly influenced by the presence of mud plugs (paleomeander clayey infilling). These mud plugs strongly contrast with the coarse sand material that composes most of the alluvial plain, and can create permeability barriers to groundwater flows. A detailed knowledge of the global and internal geometry of such paleomeanders can thus lead to a comprehensive understanding of the long-term hydrogeological processes of the alluvial plain. A geophysical survey based on the use of electromagnetic induction was performed on a wide paleomeander, situated close to the city of Nogentsur-Seine in France. In the present study we assess the advantages of combining several spatial offsets, together with both vertical and horizontal dipole orientations (six apparent conductivities), thereby mapping not only the spatial distribution of the paleomeander derived from lidar data but also its vertical extent and internal variability.

show abstract

Theoretical Developments in Electromagnetic Induction Geophysics with Selected Applications in the Near Surface

Cited by 82 publications

References 84 publications

Improved Geoarchaeological Mapping with Electromagnetic Induction Instruments from Dedicated Processing and Inversion

Improved Geoarchaeological Mapping with Electromagnetic Induction Instruments from Dedicated Processing and Inversion

Geophysical data collected during the 2014 minute 319 pulse flow on the Colorado River below Morelos Dam, United States and Mexico

Multiconfiguration electromagnetic induction survey for paleochannel internal structure imaging: a case study in the alluvial plain of the River Seine, France

Contact Info

Product

Resources

About