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Department of Geoscience

Publications from Department of Geoscience

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Christensen, N. B. & Sørensen, K. (2001). Pulled array continuous electrical sounding with an additional inductive source: an experimental design study. Geophysical Prospecting, 49, 241-254.

Christensen, N. B. (2002). A generic 1-D imaging method for transient electromagnetic data. Geophysics, 67, 438-447.

Christensen, N. B., Møller, I., Rasmussen, T., Sørenen, K. I. & Tølbøll, R. J. (2002). Analysis of Helicopterborne Electromagnetic Data for Hydrogeological Investigations. (pp. 0-0).

Christensen, N. B., Sørensen, K. I., Tølbøll, R. J., Rasmussen, T. M. & Møller, I. (2002). En vurdering af luftbårne elektromagnetiske frekvensdomænemetoders anvendelse til hydrogeofysisk kortlægning i Danmark. Geologisk Institut, Aarhus Universitet, i samarbejde med GEUS.

Christensen, N. B. & Tølbøll, R. J. (2003). Tolkning af helikopterbårne elektromagnetiske frekvensdomænedata fra Ringkjøbing Amt: Rapport til Ringkjøbing Amt.

Christensen, N. B., Wolfgram, P. & Sattel, D. (2003). Approximate 2D inversion of AEM data using the adaptive Born approximation. (pp. 0-0).

Christensen, S. (2003). A synthetic groundwater modelling study of the accuracy of GLUE uncertainty intervals. Abstract from 27th General Assembly of EGS in Nice, France.

Christensen, S. & Cooley, R. L. (2003). Experiences gained in testing a theory for modelling groundwater flow in heterogeneous media. Paper presented at Prague, June 2002.

Christensen, N. B. & Tølbøll, R. J. (2004). Tolkning af helikopterbårne elektromagnetiske frekvensdomænedata fra Stevns, Storstrøms Amt. (Rapport til Storstrøms Amt ed.).

Christensen, M. K. & Zimmermann, H. D. (2004). Allanite-(Ce) in the granitic pegmatite of Rønne, Bornholm, Denmark. In GFF Abstract volume 126 (pp. 70-71)

Christensen, S. (2004). A synthetic groundwater modelling study of the accuracy of GLUE uncertainty intervals. Hydrology Research, 35(1), 45-59.

Christensen, S. (2005). Comment on "Senisitivity analysis and determination of streambed leakance and aquifer hydraulic properties" by X. Chen and X. Chen. Journal of Hydrology, 303(1-4), 316-321.

Christensen, S. & Rasmussen, K. R. (2005). Vand på jorden. In Viden om vand (pp. 73-92). Aarhus Universitetsforlag.

Christensen, S., Moore, C. & Doherty, J. (2006). Comparison of stochastic and regression based methods for quantification of predictive uncertainty of model-simulated wellhead protection zones in heterogeneous aquifers. In M. F. P. Bierkens, J. C. Gehrels & K. Kovar (Eds.), Calibration and Reliability in Groundwater Modelling: From Uncertainty to Decision Making: Proceedings of ModelCARE’2005, The Hague, The Netherlands, June 2005. IAHS Publ. 304 (Vol. IAHS Publ. 304, pp. 202-208). IAHS Press.

Christensen, S. & R.L., C. (2003). Experiences gained in testing a theory for modelling groundwater flow in heterogeneous media. In K. Kovar & Z. Hrkal (Eds.), Calibration and Reliability in Groundwater Modelling: A Few Steps Closer to Reality: Proceedings of ModelCARE'2002, Prague, June 2002 (Vol. IAHS Publ. no. 277, pp. 22-27). IAHS Press.

Christensen, S. & Cooley, R. L. (2004). User guide to the UNC1NLI1 package and three utility programs for computation of nonlinear confidence and prediction intervals using MODFLOW-2000. U.S.Geological Survey.

Christensen, S. (2005). Kan sårbarhedskortlægningens datagrundlag og brug af modeller forbedres? In Hvordan bruger vi modeller? (pp. 103-112). ATV Jord og Grundvand.

Christensen, S., Hansen, N. E., Jacobsen, B. H., Rasmussen, K. R. & Schmidt, O. (2003). Jagten på frisk drikkevand – de kostbare dråber: MatematikFysikKemi i Perspektiv. (2, nr. 4 ed.)

Christensen, S. (2002). A synthetic groundwater modelling study of the accuracy of GLUE uncertainty intervals. Abstract from 27th General Assembly of EGS in Nice, France.

Christensen, S., Cooley, R. L., Kovar (red.), K. & Hrkal (red.), Z. (2002). Experiences from the testing of a theory for modelling groundwater flow in heterogeneous media. Paper presented at 4th Int. Conf. on Calibration and Reliability in Groundwater Modelling, Model CARE, Charles University, Prague.

Christensen, N. B. (2006). Monitoring CO₂ injection with cross-hole electrical resistivity tomography. Exploration Geophysics, 37, 44-49.

Christensen, N. B., Dodds, K. & Bulley, I. (2006). 1D inversion and analysis of marine controlled-source EM data. In Proceedings of the AAPG meeting, Perth, WA, November 5-8, 2006.

Christensen, N. B. & Wolfgram, P. (2006). Approximate 2D inversion of airborne TEM data. In Australian Earth Science Convention, 2-7 July, Melbourne, Australia Australian Earth Science Convention.

Christensen, S. & Doherty, J. (2008). Using many pilot points and singular value decomposition in groundwater model calibration. In J. C. Refsgaard, K. Kovar, E. Haarder & E. Nygaard (Eds.), Calibration and Reliability in Groundwater Modelling: Credibility in modelling: Proc. ModelCARE'2007 (Copenhagen, September 2007) (Vol. IAHS Publication 320, pp. 235-239). IAHS Press.

Christensen, S. & Doherty, J. (2008). Using many pilot points and singular value decomposition in groundwater model calibration. In J. C. Refsgaard & E. Nygaard (Eds.), ModelCARE’2007 , nt. Conf. on Calibration and Reliability in Groundwater Modelling – Credibility in Modelling: Pre-published proceedings (Vol. 2, pp. 448-453). GEUS.

Christensen, N. B. & Dodds, K. (2007). Special Section - Marine Controlled-Source Electromagnetic Methods. 1D inversion and resolution analysis of marine controlled-source EM data. Geophysics, 72, WA27-WA38.

Christensen, S. & Doherty, J. (2008). Predictive error dependencies when using pilot points and singular value decomposition in groundwater model calibration. Advances in Water Resources, 31(4), 674-700.

Christensen, S., Zlotnik, V. A. & Tartakovsky, D. M. (2009). Optimal design of pumping tests in leaky aquifiers for stream depletion analysis. Journal of Hydrology, 375(3-4), 554-565. https://doi.org/10.1016/j.jhydrol.2009.07.006

Christensen, A.-S. H., Lykke-Andersen, H., Jørgensen, F., Nørmark, E. & Auken, E. (2009). Integration of Seismics and SkyTEM in a Heterogeneous Geological Setting. Abstract from American Geophysical Union (AGU) Fall Meeting, San Francisco, United States.

Christensen, S., Zlotnik, V. A. & Tartakovsky, D. M. (2010). On the use of analytical solutions to design pumping tests in leaky aquifers connected to a stream. Journal of Hydrology, 381(3-4), 341-351. https://doi.org/10.1016/j.jhydrol.2009.12.007

Christensen, N. B. & Tølbøll, R. J. (2009). A lateral model parameter correlation procedure for one-dimensional inverse modelling. Geophysical Prospecting, 57(5), 919-929. https://doi.org/10.1111/j.1365-2478.2008.00756.x

Christensen, N. B., Reid, J. E. & Halkjær, M. (2009). Fast, laterally smooth inversion of airborne time-domain electromagnetic data. Near Surface Geophysics, 7(5-6), 599-612. https://doi.org/10.3997/1873-0604.2009047

Christensen, N. B., Fitzpatrick, A. & Munday, T. (2010). Fast approximate 1D inversion of frequency domain electromagnetic data. Near Surface Geophysics, 8(1), 1-15. https://doi.org/10.3997/1873-0604.2009026

Christensen, A. D., Egholm, D. L. & Piotrowski, J. A. (2011). Numerical modelling of sediment deformation by glacial stress. Abstract from XVIII INQUA Congress, Bern, Switzerland. http://cs.au.dk/~adc/files/INQUA2011-Poster.pdf

Christensen, A. D., Egholm, D. L. & Piotrowski, J. A. (2011). Numerical modelling of subglacial sediment deformation. Geophysical Research Abstracts, 13(EGU2011-7829). http://meetingorganizer.copernicus.org/EGU2011/EGU2011-7829.pdf

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

Christensen, A. D., Egholm, D. L., Piotrowski, J. A. & Tulaczyk, S. (2012). Discrete Element modelling of subglacial sediment deformation. Geophysical Research Abstracts, 14, EGU2012-2931. http://presentations.copernicus.org/EGU2012-2931_presentation.pdf

Christensen, N. K., Christensen, S. & Ferre, T. (2014). Hydro-geofysisk "Testbench". Abstract from ATV Vintermøde om Forurenet Jord og Grundvand, Vingsted, Denmark.

Christensen, N. B. (2014). Sensitivity functions of transient electromagnetic methods. Geophysics, 79(4), E167-E182. https://doi.org/10.1190/GEO2013-0364.1

Christensen, N. B. & Halkjær, M. (2014). Mapping pollution and coastal hydrogeology with helicopterborne transient electromagnetic measurements. Exploration Geophysics, 45(4), 243-254. https://doi.org/10.1071/EG13071

Christensen, N. B. & Lawrie, K. (2014). Response to comments by Adam Smiarowski and Shane Mulè on: Christensen, N., and Lawrie, K., 2012. Resolution analyses for selecting an appropriate airborne electromagnetic (AEM) system. Exploration Geophysics, 43, 213-227. https://doi.org/10.1071/EG14015

Christensen, N. K., Christensen, S. & Ferre, T. (2014). Integrating geophysics and hydrology for reducing the uncertainty of groundwater model predictions and improved prediction performance. Abstract from AGU Fall Meeting, San Francisco, United States.

Christensen, N. K., Christensen, S. & Ferre, T. (2014). Testing how geophysics can reduce the uncertainty of groundwater model predictions. Geophysical Research Abstracts, 16, Article EGU2014-9602. http://meetingorganizer.copernicus.org/EGU2014/EGU2014-9602.pdf

Christensen, L. & Friedrich, W. L. (1973). Stenenes kædedans - ringe-netværk og striber - i marken. Varv, (4), 99-106.

Christensen, N. K., Christensen, S. & Ferre, T. (2016). Testing alternative uses of electromagnetic data to reduce the prediction error of groundwater models. Hydrology and Earth System Sciences, 20(5), 1925-1946. https://doi.org/10.5194/hess-20-1925-2016

Christensen, N. K., Ferre, T., Fiandaca, G. & Christensen, S. (2017). Voxel inversion of airborne electromagnetic data for improved groundwater model construction and prediction accuracy. Hydrology and Earth System Sciences, 21(2), 1321-1337. https://doi.org/10.5194/hess-21-1321-2017

Christensen, N. K. (2016). Hydrological and geophysical test-bench modeling: Integrating geophysics, geology, and hydrology for improved predictive capability of groundwater models.

Christensen, N. B. (2016). Fast approximate 1D modelling and inversion of transient electromagnetic data. Geophysical Prospecting, 64(6), 1620-1631. https://doi.org/10.1111/1365-2478.12373

Christensen, N. B. (2016). Strictly horizontal lateral parameter correlation for 1D inverse modelling of large data sets. Near Surface Geophysics, 14(5), 403-411 . https://doi.org/10.3997/1873-0604.2016028

Christensen, N. K., Minsley, B. J. & Christensen, S. (2017). Generation of 3-D hydrostratigraphic zones from dense airborne electromagnetic data to assess groundwater model prediction error. Water Resources Research, 53(2), 1019-1038. https://doi.org/10.1002/2016WR019141

Displaying results 651 to 700 out of 4845

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Ann Eg Mølhave