Abstract
For more than half a century airborne electromagnetic (AEM) methods have been used worldwide for cost-effective resistivity mapping of areas larger than several hundred km2. The technical developments and intensive use of these systems, principally in mining exploration during the first decades, led to the development of helicopter transient EM (HTEM) systems. Since the 2000s these systems provide the best lateral and vertical resolution for environmental exploration, and they still keep a good depth of investigation allowing the exploration from the first meters to depths of several hundred meters. This chapter focuses on helicopter borne transient electromagnetic (HTEM) systems, which are well suited for the detection of low resistive targets such as salt water intrusion in coastal zones.
AEM methods are based on the diffusive induction phenomenon. It is a key tool for building realistic hydrogeological models; however it requires an understanding of its limits, and some insight into data processing modeling is necessary. They require careful processing, and removal of cultural EM noise, present in most survey areas, is mandatory in order to get high quality results. Accurate modeling of the data and of the system is also critical. The modeling is most often based on least-square optimization algorithms giving smooth or layered model descriptions of ground.
In this chapter we describe the AEM method in detail and we discuss processing and inversion of data. To demonstrate the results from an investigation, we end the chapter with a case study of a SkyTEM survey made in the volcanic island of Mayotte where key geological structures and salt water intrusion were successfully mapped.
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References
Albouy Y, Andrieux P, Rakotondrasoa G, Ritz M, Descloitres M, Join J-L, Rasolomanana E (2001) Mapping coastal aquifers by joint inversion of DC and TEM soundings – three case histories. Ground Water 39(1):87–97
Allard M (2007) On the origin of the HTEM species. In: Proceedings of exploration: fifth decennial international conference on mineral exploration, Toronto, 2007, pp 355–374
Audru JC, Guennoc P, Thinon I, Abellard O (2006) Bathymay: la structure sous-marine de Mayotte révélée par l’imagerie multifaisceaux. CR Geosci 338(16):1240–1249
Auken E, Christiansen AV (2004) Layered and laterally constrained 2D inversion of resistivity data. Geophysics 69(3):752–761
Auken E, Christiansen AV, Westergaard JA, Kirkegaard C, Foged N, Viezzoli A (2009a) An integrated processing scheme for high-resolution airborne electromagnetic surveys, the SkyTEM system. Explor Geophys 40(2):184–192
Auken E, Violette S, d’Ozouville N, Deffontaines B, Sorensen KI, Viezzoli A, de Marsily G (2009b) An integrated study of the hydrogeology of volcanic islands using helicopter borne transient electromagnetic: application in the Galapagos Archipelago. CR Geosci 34(10–11):899–907
Auken E, Foged N, Roth B, Mikkelsen P (2010a) SkyTEM survey Mayotte 2010, Survey report, Department of Geoscience, Aarhus University
Auken E, Foged N, Sørensen KI (2010b) Approaching 10 microsec (and earlier) with the SkyTEM system. In: ASEG extended abstract, 21st international geophysical conference and exhibition, Sydney, 22–26 Aug 2010
Auken E, Mikucki J, Sørensen KI, Schamper C, Sab G-A, Tulaczyk S (2012) First airborne transient EM survey in Antarctica: mapping of saline ground water system. In: Remote sensing-near surface geoscience extended abstract, 18th European meeting of environmental and engineering geophysics, Paris, 3–5 Sept 2012
Blaschek R, Hördt A, Kemna A (2008) A new sensitivity-controlled focusing regularization scheme for the inversion of induced polarization data based on the minimum gradient support. Geophysics 73(2):F45–F54
Buselli G, Williamson DR (1996) Modeling of broadband airborne electromagnetic responses from saline environments. Geophysics 61(6):1624–1632
Christiansen AV, Auken E (2012) A global measure for depth of investigation. Geophysics 77(4):171–177
Christiansen AV, Auken E, Sørensen KI (2006) The transient electromagnetic method. In: Kirsch R (ed) Groundwater geophysics: a tool for hydrogeology. Springer, Berlin
Christiansen AV, Auken E, Viezzoli A (2011) Quantification of modeling errors in airborne TEM caused by inaccurate system description. Geophysics 76(1):F43–F52
Cox LH, Wilson GA, Zhdanov MS (2012) 3D inversion of airborne electromagnetic data. Geophysics 77(4):WB59–WB69
Cruz JV, Silva MO (2001) Hydrogeologic framework of Pico Island, Azores, Portugal. Hydrogeol J 9(2):177–189
Cruz JV, Coutinho R, Pacheco D, Cymbron R, Antunes P, Freire P, Mendes S (2011) Groundwater salinization in the Azores archipelago (Portugal). Environ Earth Sci 62(6):1273–1285
Custodio E (2004) Hydrogeology of volcanic rocks. In: Kovalevsky VS, Kruseman GP, Rushton GR (eds) Groundwater studies: an international guide for hydrogeological investigations. UNESCO, Paris, pp 395–425
Custodio E, Lopez GL, Amigo E (1988) Simulation par modèle mathématique de l’île volcanique de Ténériffe (Canaries, Espagne). Hydrogéologie 2:153–167
Debeuf D (2004) Etude de l’évolution volcano-structurale et magmatique de Mayotte (Archipel des Comores, Océan Indien), approche structurale, pétrographique géochimique et géochronologique). PhD thesis of The University of La Réunion, 277 p
d’Ozouville N, Auken E, Sorensen KI, Violette S, de Marsily G (2008) Extensive perched aquifer and structural implications revealed by 3D resistivity mapping in a Galapagos volcano. Earth Planet Sci Lett 269(3–4):517–521
Descloitres M, Ritz M, Robineau B, Courteaud M (1997) Electrical structure beneath the eastern collapsed flank of Piton de la Fournaise volcano, Reunion Island: implications for the quest of groundwater. Water Resour Res 33(1):13–19
Emerick CM, Duncan RA (1982) Age progressive volcanism in the ComoroArchipelago, western IndianOcean and implications for Somali plate tectonics. Earth Planet Sci Lett 60(3):415–428
Farquharson CG, Oldenburg DW (1993) Inversion of time-domain electromagnetic data for a horizontally layered Earth. Geophys J Int 114(3):433–442
Fitterman DV, Deszcz-Pan M (1998) Helicopter EM mapping of saltwater intrusion in Everglades National Park, Florida. Explor Geophys 29(2):240–243
Fitterman DV, Meekes JAC, Ritsema IL (1988) Equivalence behavior of three electrical sounding methods as applied to hydrogeological problems. In: EAGE, 50th annual meeting, The Hague, 1988
Foged N, Auken E, Christiansen AV, Sørensen KI (2013) Test site calibration and validation of airborne and ground based TEM-systems. Geophysics 78(2):E95–E106
Fountain D (1998) Airborne electromagnetic systems – 50 years of development. Explor Geophys 29(2):1–11
Fountain D (2008) 60 years of airborne EM – focus on the last decade. In: Proceedings of the 5th international conference on airborne electromagnetics (AEM2008), Haikko Manor, 28–30 May 2008
Gubbins D (2004) Time series analysis and inverse theory for geophysicists. Cambridge University Press, Cambridge/New York, 272 pp
Henderson A (2007) ParaView guide, a parallel visualization application. Kitware Inc., Clifton Park
Herrera C, Custodio E (2008) Conceptual hydrogeological model of volcanic Easter Island (Chile) after chemical and isotopic surveys. Hydrogeol J 16(7):1329–1348
Izuka SK, Gingerich SB (2003) A thick lens of fresh groundwater in the southern Lihue Basin, Kauai, Hawaii, USA. Hydrogeol J 11(2):240–248
Jørgensen F, Scheer W, Thomsen S, Sonnenborg TO, Hinsby K, Wiederhold H, Schamper C, Burschil T, Roth B, Kirsch R, Auken E (2012) Transboundary geophysical mapping of geological elements and salinity distribution critical for the assessment of future sea water intrusion in response to sea level rise. Hydrol Earth Syst Sci 16(7):1845–1862
Kim Y, Lee K-S, Koh D-C, Lee D-H, Lee S-G, Park W-B, Koh G-W, Woo N-C (2003) Hydrogeochemical and isotopic evidence of groundwater salinization in a coastal aquifer: a case study in Jeju volcanic island, Korea. J Hydrol 270(3–4):282–294
Kirkegaard C, Sonnenborg TO, Auken E, Jørgensen F (2011) Salinity distribution in heterogeneous coastal aquifers mapped by airborne electromagnetics. Vadose Zone J 10(1):125–135
Lénat JF, Fitterman D, Jackson DB, Labazuy P (2000) Geoelectrical structure of the central zone of Piton de la Fournaise volcano (Réunion). Bull Volcanol 62(2):75–89
Lienert BR (1991) An electromagnetic study of Maui’s last active volcano. Geophysics 56(7):972–982
Macnae JC, Lamontagne Y, West GF (1984) Noise processing techniques for time-domain EM systems. Geophysics 49(7):934–948
Marquardt DW (1963) An algorithm for least-squares estimation of nonlinear parameters. J Soc Ind Appl Math Control 11(2):431–441
Marquardt DW (1970) Generalized inverses, ridge regression, biased linear estimation and nonlinear estimation. J Soc Ind Appl Math Control 12(3):591–612
Menke W (1989) Geophysical data analysis: discrete inversion theory. Academic, San Diego, 260 pp
Møller I, Verner H, Søndergaard VH, Flemming J, Auken E, Christiansen AV (2009) Integrated management and utilization of hydrogeophysical data on a national scale. Near Surf Geophys 7(5–6):647–659
Munkholm MS, Auken E (1996) Electromagnetic noise contamination on transient electromagnetic soundings in culturally disturbed environments. J Environ Eng Geophys 1(2):119–127
Nougier J, Cantagrel JM, Karche JP (1986) The Comores archipelago in the western Indian Ocean: volcanology, geochronology and geodynamic setting. Journal of African Earth Sciences (1983) 5(2):135–144
Paine JG (2003) Determining salinization extent, identifying salinity sources, and estimating chloride mass using surface, borehole, and airborne electromagnetic induction methods. Water Resour Res 39(3):3-1–3-10
Peterson FL (1972) Water development on tropic volcanic islands. Type example: Hawaii. Ground Water 10(5):18–23
Portniaguine O, Zhdanov MS (2002) 3-D magnetic inversion with data compression and image focusing. Geophysics 67(5):1532–1541
Pryet A, d’Ozouville N, Violette S, Deffontaines B, Auken E (2012) Hydrogeological settings of a volcanic island (San Cristóbal, Galapagos) from joint interpretation of airborne electromagnetics and geomorphological observations. Hydrol Earth Syst Sci Discuss 9(8):9661–9686
Sab G-A (2012) Data processing of an Airborne Electromagnetic survey in Antarctica. Master thesis made at the Hydrogeogphysics Group, Aarhus University, Aarhus
Schamper C, Auken E, Sørensen KI (2012) A new processing system for very early time SkyTEM101 data. In: ASEG, 22nd international geophysical conference and exhibition, Brisbane, 26–29 Feb 2012
Siemon B, Christiansen AV, Auken E (2009) A review of helicopter-borne electromagnetic methods for groundwater exploration. Near Surf Geophys 7(5–6):629–646
Sørensen KI, Auken E (2004) SkyTEM – a new high-resolution helicopter transient electromagnetic system. Explor Geophys 35(3):191–199
Stieltjes L (1988) Hydrogéologie de l’île volcanique océanique de Mayotte (Archipel des Comores, ocean indien occidental). Hydrogéologie 2:135–151
Teatini P, Tosi L, Viezzoli A, Baradello L, Zecchin M, Silvestri S (2011) Understanding the hydrogeology of the Venice Lagoon subsurface with airborne electromagnetics. J Hydrol 411(3–4):342–354
Thomsen R, Søndergaard VH, Sørensen KI (2004) Hydrogeological mapping as a basis for establishing site-specific groundwater protection zones in Denmark. Hydrogeology 12(5):550–562
Tikhonov AN, Arsenin VY (1977) Solution of ill-posed problems. V.H. Winston and Sons, Washington, DC, 258 pp
Viezzoli A, Christiansen AV, Auken E, Sørensen KI (2008) Quasi-3D modeling of airborne TEM data by spatially constrained inversion. Geophysics 73(3):F105–F113
Vittecoq B, Deparis J, Auken E, Nehlig P, Perrin J, Puvilland P, Martelet G (2011a) Buried valleys revealed by helicopter borne transient electromagnetic and hydrogeological implications: example of the volcanic island of Mayotte. In: 2011 GSA annual meeting, Minneapolis, 9–12 Oct 2011
Vittecoq B, Jaouen T, Deparis J (2011b) Programme de recherche et d’exploitation des eaux souterraines de Mayotte – 5ème campagne de forage à Mayotte. Révision des implantations. REPORT/RP-60035-FR, BRGM, Orléans, France
Ward SH, Hohmann GW (1988) Electromagnetic theory for geophysical applications. In: Nabighian MN (ed) Electromagnetic methods in applied geophysics, vol 1. SEG, Tulsa, pp 131–311
Werner AD, Bakkerd M, Posta VEA, Vandenbohede A, Lua C, Ataie-Ashtiania B, Simmonsa CT, Barrye DA (2012) Seawater intrusion processes, investigation and management: recent advances and future challenges. Adv Water Resour 51, 24 pp
Witherly K, Irvine R, Morrison E (2004) The Geotech VTEM time domain helicopter EM system. In: ASEG extended abstracts, 17th international geophysical conference and exhibition, Sydney, 15–19 Aug 2004
Yang D, Oldenburg DW (2012) Three-dimensional inversion of airborne time-domain electromagnetic data with applications to a porphyry deposit. Geophysics 77(2):B23–B34
Acknowledgement
This work was carried out with the financial support of the Mayotte Prefecture and Department, the French Ministry of Environment, SIEAM (local water supply authority) and BRGM, the French geological survey.
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Schamper, C. et al. (2013). Airborne Transient EM Methods and Their Applications for Coastal Groundwater Investigations. In: Wetzelhuetter, C. (eds) Groundwater in the Coastal Zones of Asia-Pacific. Coastal Research Library, vol 7. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-5648-9_7
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