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Department of Geoscience

HydroGeophysics Group

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Fiandaca, G , Ramm, J, Binley, A, Gazoty, A , Christiansen, AV & Auken, E 2013, 'Resolving spectral information from time domain induced polarization data through 2-D inversion', Geophysical Journal International, vol. 192, no. 2, pp. 631-646. https://doi.org/10.1093/gji/ggs060

Fiandaca, G , Doetsch, J , Vignoli, G & Auken, E 2015, 'Generalized focusing of time-lapse changes with applications to direct current and time-domain induced polarization inversions', Geophysical Journal International, vol. 203, no. 2, pp. 1101-1112. https://doi.org/10.1093/gji/ggv350

Fiandaca, G , Maurya, PK, Balbarini, N, Hördt, A, Christiansen, AV , Foged, N, Bjerg, PL & Auken, E 2018, 'Permeability Estimation Directly From Logging-While-Drilling Induced Polarization Data', Water Resources Research, vol. 54, no. 4, pp. 2851-2870. https://doi.org/10.1002/2017WR022411

Fiandaca, G , Madsen, LM & Maurya, PK 2018, 'Re-parameterisations of the Cole-Cole model for improved spectral inversion of induced polarization data', Near Surface Geophysics, vol. 16, no. 4, pp. 385-399. https://doi.org/10.3997/1873-0604.2017065

Fiandaca, G, Olsson, PI, Maurya, PK , Kühl, A , Bording, T, Dahlin, T & Auken, E 2022, 'Heterodox transients in time-domain-induced polarization', Geophysics, vol. 87, no. 1, pp. E35-E47. https://doi.org/10.1190/geo2020-0808.1

Fay, E, Grombacher, DJ & Knight, R 2017, 'Investigating the effect of internal gradients on static gradient nuclear magnetic resonance diffusion measurements', Geophysics, vol. 82, no. 5, pp. D293-D301. https://doi.org/10.1190/geo2016-0420.1

Fareed, MMS, Chun, Q, Ahmed, G, Murtaza, A, Asif, MR & Fareed, MZ 2019, 'Salient region detection through salient and non-salient dictionaries', PLoS One, vol. 14, no. 3, e0213433. https://doi.org/10.1371/journal.pone.0213433

Fareed, MMS, Chun, Q, Ahmed, G, Murtaza, A, Asif, MR & Fareed, MZ 2019, 'Appearance-based salient regions detection using side-specific dictionaries', Sensors (Switzerland), vol. 19, no. 2, 421. https://doi.org/10.3390/s19020421

Fareed, MMS, Chun, Q, Ahmed, G, Rizwan Asif, M & Bibi, I 2017, 'Maximum mean discrepancy regularized sparse reconstruction for robust salient regions detection', Signal Processing: Image Communication, vol. 54, pp. 66-80. https://doi.org/10.1016/j.image.2017.02.013

Falk, FA , Christiansen, AV & Hansen, TM 2025, 'Comparison of three one-dimensional time-domain electromagnetic forward algorithms', Applied Computing and Geosciences, vol. 26, 100243. https://doi.org/10.1016/j.acags.2025.100243

Ensted Danielsen, J, Auken, E & Sørensen, K 2001, 'Høj-Moment-TEM - udvikling af en ny metode', Geologisk Nyt, no. 5, pp. 11-13.

Engebretsen, KW , Zhang, B , Fiandaca, G , Meldgaard Madsen, L , Auken, E & Christiansen, AV 2022, 'Accelerated 2.5-D inversion of airborne transient electromagnetic data using reduced 3-D meshing', Geophysical Journal International, vol. 230, no. 1, pp. 643-653. https://doi.org/10.1093/gji/ggac077, https://doi.org/10.1093/gji/ggac077

Edsen, A, Larsen, TH, Tuxen, N, Kerrn-Jespersen, H, Hamburger, N, Looms, MC, Nielsen, L, Christiansen, AV , Fiandaca, G , Bording, TS , Maurya, PK , Auken, E , Nørmark, E, Strøyberg Klint, KE, Møller, I & Vignoli, G 2016, 'Kortlægning af sandlinser i moræneler med geofysik - kan man det?', Miljø og ressourcer, vol. 2016/4, 4, pp. 11-21. <http://miljoeogressourcer.dk/filer/avjinfo/143/Milj___og_Ressourcer_5_2016_web.pdf>

Dugan, HA, Doran, PT, Tulaczyk, S, Mikucki, JA, Arcone, SA, Auken, E , Schamper, C & Virginia, RA 2015, 'Subsurface imaging reveals a confined aquifer beneath an ice-sealed Antarctic lake', Geophysical Research Letters (Online), vol. 42, no. 1, pp. 96-103. https://doi.org/10.1002/2014GL062431

Dugan, HA, Doran, PT, Grombacher, D , Auken, E , Bording, T , Foged, N, Foley, N, Mikucki, J, Virginia, RA & Tulaczyk, S 2022, 'Brief communication: The hidden labyrinth: deep groundwater in Wright Valley, Antarctica', Cryosphere, vol. 16, no. 12, pp. 4977-4983. https://doi.org/10.5194/tc-16-4977-2022

D. Parsekian, A & Grombacher, D 2015, 'Uncertainty estimates for surface nuclear magnetic resonance water content and relaxation time profiles from bootstrap statistics', Journal of Applied Geophysics, vol. 119, pp. 61-70. https://doi.org/10.1016/j.jappgeo.2015.05.005

D. Parsekian, A, Claes, N, Singha, K, Minsley, BJ, Carr, B, Voytek, E, Kass, MA, Harmon, R, Carey, A, Thayer, D & Flinchum, B 2017, 'Comparing measurement response and inverted results of electrical resistivity tomography instruments', Journal of Environmental & Engineering Geophysics, vol. 22, no. 3, pp. 249-266. https://doi.org/10.2113/JEEG22.3.249

d'Ozouville, N, Auken, E , Sørensen, KI, Violette, S, Marsily, GD, Deffontaines, B & Merlen, G 2008, 'Extensive perched aquifer and structural implications revealed by 3D resistivity mapping in a Galapagos volcano', Earth and Planetary Science Letters, no. 269, pp. 518-522.

Domenzain, D , Liu, L , Yélamos Vela, I & Christiansen, AV 2023, '3D DC inversion, visualization, and processing of dense time-lapse data in fine domains applied to remediation monitoring', Geophysics, vol. 88, no. 5, pp. E147-E158. https://doi.org/10.1190/geo2023-0093.1

Doetsch, J , Fiandaca, G , Auken, E , Christiansen, AV, Cahill, AG & Jakobsen, R 2015, 'Field-scale time-domain spectral induced polarization monitoring of geochemical changes induced by injected CO2 in a shallow aquifer', Geophysics, vol. 80, no. 2, pp. WA113-WA126. https://doi.org/10.1190/GEO2014-0315.1

Doetsch, J, Ingeman-Nielsen, T, Christiansen, AV , Fiandaca, G , Auken, E & Elberling, B 2015, 'Direct current (DC) resistivity and induced polarization (IP) monitoring of active layer dynamics at high temporal resolution', Cold Regions Science and Technology, vol. 119, pp. 16-28. https://doi.org/10.1016/j.coldregions.2015.07.002

Ding, PP & Christensen, NB 2010, 'A modifed Fast Hankel Transform algorithm for calculating planar multilayered Green’s function', IEEE Data Engineering Bulletin, pp. 47.

Davis, A & Christensen, NB 2013, 'Derivative analysis for layer selection of geophysical borehole logs', Computers & Geosciences, vol. 60, pp. 34-40. https://doi.org/10.1016/j.cageo.2013.06.015

Danielsen, JE, Auken, E, Jørgensen, F, Søndergaard, VH & Sørensen, KI 2003, 'The application of the transient electromagnetic method in hydrogeophysical surveys', Journal of Applied Geophysics, vol. 53, pp. 181-198.

Dalgaard, E , Auken, E & Larsen, JJ 2012, 'Adaptive noise cancelling of multichannel magnetic resonance sounding signals', Geophysical Journal International, vol. 191, no. 1, pp. 88-100. https://doi.org/10.1111/j.1365-246X.2012.05618.x

Dalgaard, EB, Christiansen, P, Larsen, JJ & Auken, E 2014, 'A temporal and spatial analysis of anthropogenic noise sources affecting SNMR', Journal of Applied Geophysics, vol. 110, pp. 34-42. https://doi.org/10.1016/j.jappgeo.2014.08.009

Dalgaard, E, Mueller-Petke, M & Auken, E 2016, 'Enhancing SNMR model resolution by selecting an optimum combination of pulse moments, stacking, and gating', Near Surface Geophysics, vol. 14, no. 3, pp. 243-253. https://doi.org/10.3997/1873-0604.2016004

Couto Junior, MA, Fiandaca, G , Maurya, PK , Christiansen, AV, Porsani, JL & Auken, E 2020, 'AEMIP robust inversion using maximum phase angle Cole-Cole model re-parameterisation applied for HTEM survey over Lamego gold mine, Quadrilatero Ferrifero, MG, Brazil', Exploration Geophysics, vol. 51, no. 1, pp. 170-183. https://doi.org/10.1080/08123985.2019.1682458

Corriols, M, Nielsen, MR, Dahlin, T & Christensen, NB 2009, 'Aquifer investigations in the León-Chinandega plains, Nicaragua, using electromagnetic and electrical methods', Near Surface Geophysics, vol. 7, no. 5-6, pp. 413-425. https://doi.org/10.3997/1873-0604.2009034

Christiansen, AV & Christensen, NB 2002, 'A quantitative appraisal of airborne and ground-based transient electromagnetic (TEM) measurements in Denmark', Geophysics (online), pp. 0-0.

Christiansen, AV & Christensen, NB 2003, 'A quantitative appraisal of airborne and ground-based transient electromagnetic (TEM) measurements in Denmark', Geophysics, vol. 68, pp. 523-534.

Christiansen, AV & Auken, E 2004, 'Optimizing a layered and laterally constrained 2D inversion of resistivity data using Broyden's update and 1D derivatives', Journal of Applied Geophysics, vol. 56, pp. 247-261.

Christiansen, AV , Auken, E , Foged, N & Sørensen, KI 2007, 'Mutually and laterally constrained inversion of CVES and TEM data: a case study', Near Surface Geophysics, pp. 115-123.

Christiansen, AV & Auken, E 2012, 'A global measure for depth of investigation', Geophysics, vol. 77, no. 4, pp. WB171-WB177. https://doi.org/10.1190/geo2011-0393.1

Christiansen, AV, Auken, E & Viezzoli, A 2011, 'Quantification of modeling errors in airborne TEM caused by inaccurate system description', Geophysics, vol. 76, no. 1, pp. F43-F52. https://doi.org/10.1190/1.3511354

Christiansen, AV , Foged, N & Auken, E 2014, 'A concept for calculating accumulated clay thickness from borehole lithological logs and resistivity models for nitrate vulnerability assessment', Journal of Applied Geophysics, vol. 108, pp. 69-77. https://doi.org/10.1016/j.jappgeo.2014.06.010

Christiansen, AV , Auken, E , Kirkegaard, C , Schamper, CNC & Vignoli, G 2016, 'An efficient hybrid scheme for fast and accurate inversion of airborne transient electromagnetic data', Exploration Geophysics, vol. 47, no. 4, pp. 331-340. https://doi.org/10.1071/EG14121

Christiansen, AV , Pedersen, JB , Auken, E , Soe, NE , Holst, MK & Kristiansen, SM 2016, 'Improved Geoarchaeological Mapping with Electromagnetic Induction Instruments from Dedicated Processing and Inversion', Remote Sensing, vol. 8, no. 12, 1022. https://doi.org/10.3390/rs8121022

Christiansen, AV & Auken, E 2004, 'Optimizing a layered and laterally constrained 2D inversion of resistivity data using Broyden's update and ID derivatives', Journal of Applied Geophysics, vol. 56, no. 4, pp. 247-261. https://doi.org/10.1016/S0926-9851(04)00055-2

Christiansen, AV , Frederiksen, RR , Vilhelmsen, TN , Christensen, S, Maurya, PK, Hansen, B, Kim, H, Høyer, AS, Aamand, J, Jakobsen, R, Børgesen, CD, Jacobsen, BH & Auken, E 2023, 'N-Map: High-resolution groundwater N-retention mapping and modelling by integration of geophysical, geological, geochemical, and hydrological data', Journal of Environmental Management, vol. 343, 118126. https://doi.org/10.1016/j.jenvman.2023.118126

Christiansen, AV , Pedersen, JB , Auken, E , Søe, NE , Holst, MK & Kristiansen, SM 2016, 'Improved geoarchaeological mapping with electromagnetic induction instruments from dedicated processing and inversion', Remote Sensing, vol. 8, no. 12, 1022. https://doi.org/10.3390/rs8121022

Christensen, NB & Sørensen, K 2001, 'Pulled array continuous electrical sounding with an additional inductive source: an experimental design study', Geophysical Prospecting, vol. 49, pp. 241-254.

Christensen, NB 2002, 'A generic 1-D imaging method for transient electromagnetic data', Geophysics, vol. 67, pp. 438-447.

Christensen, NB 2006, 'Monitoring CO₂ injection with cross-hole electrical resistivity tomography', Exploration Geophysics, vol. 37, pp. 44-49.

Christensen, NB & Dodds, K 2007, 'Special Section - Marine Controlled-Source Electromagnetic Methods. 1D inversion and resolution analysis of marine controlled-source EM data', Geophysics, vol. 72, pp. WA27-WA38.

Christensen, NB & Tølbøll, RJ 2009, 'A lateral model parameter correlation procedure for one-dimensional inverse modelling', Geophysical Prospecting, vol. 57, no. 5, pp. 919-929. https://doi.org/10.1111/j.1365-2478.2008.00756.x

Christensen, NB, Reid, JE & Halkjær, M 2009, 'Fast, laterally smooth inversion of airborne time-domain electromagnetic data', Near Surface Geophysics, vol. 7, no. 5-6, pp. 599-612. https://doi.org/10.3997/1873-0604.2009047

Christensen, NB, Fitzpatrick, A & Munday, T 2010, 'Fast approximate 1D inversion of frequency domain electromagnetic data', Near Surface Geophysics, vol. 8, no. 1, pp. 1-15. https://doi.org/10.3997/1873-0604.2009026

Christensen, NB & Lawrie, K 2012, 'Resolution analyses for selecting an appropriate airborne electromagnetic (AEM) system', Exploration Geophysics, vol. 43, pp. 213-227. <http://www.publish.csiro.au/nid/224/display/citation/paper/EG12005.htm>

Christensen, NB 2014, 'Sensitivity functions of transient electromagnetic methods', Geophysics, vol. 79, no. 4, pp. E167-E182. https://doi.org/10.1190/GEO2013-0364.1

Displaying results 201 to 250 out of 323

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Revised 01.11.2024

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