Fiva - Research School of Water Resources

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Name:	Torben Obel Sonnnenborg
Position:	Senior Scientist
Institution:	Geological Survey of Denmark and Greenland, Department of Hydrology
Address:	Øster Voldgade 10, DK-1350 Copenhagen K.
Phone:	+45 3814 2787
Email:	tso@geus.dk
Website:	http://www.geus.dk/geuspage-uk.htm

Research interests: Climate change impacts on the hydrological system Catchment scale groundwater and hydrological modelling Effect of geological heterogeneity on flow and transport Inverse modelling Groundwater protection and uncertainty Hydrogeology of buried valleys Flow and transport in fractured porous media
Involvement in research projects: HOBE - a Hydrological Observatory and Exploratorium. VKR Center of Excellence. Responsable for hydrological modeling. PRECIOUS - Prediction of Climatic Impacts on Pesticide Leaching to the Aquatic Environments, 2008-2010. Danish EPA research project. HYACINTS - Hydrological Modelling for Assessing Climate Change Impacts at Different Scales, 2008-2012. Danish research project. CLIWAT - Adaptive and sustainable water management and protection of society and nature in an extreme climate, 2008-2011. North Sea Interreg project. BaltCICA - Climate Change: Impacts, Costs and Adaptation in the Baltic Sea Region, 2009-2011. Baltic Sea Interreg Project.
Advisor for PhD students: Ellen Prip Bonnesen, Stability of a Saltwater/Freshwater Interface in Fractured Carbonate Aquifers Peter Scharling, Hydrogeological modeling of Miocene aquifers in Western Denmark Lieke van Roosmalen, Impact assessment of future climate changes on water resources in Denmark on catchment scale

Key publications:

1. Sonnenborg, T.O., P. Engesgaard, and D. Rosbjerg (1996), Contaminant transport at a waste incinerator residue deposit: 1. Inverse modelling, Water Resources Research, 32(4), 925-938.
2. Wildenschild, D., K.H. Jensen, T. Illangasekare, K.J. Hollenbeck, D. Snirdarcic, T.O. Son-nenborg, and M.B. Butts (1997), A two-stage procedure for determining unsaturated hy-draulic characteristics using a syringe pump and outflow observations, Soil Science Society of America Journal, 61(2), 347-359.
3. Jørgensen, P.R., K. Broholm, T.O. Sonnenborg, and E. Arvin (1998), DNAPL transport through macroporous, clayey till columns, Ground Water, 36(4), 651-660.
4. Sonnenborg, T.O., M.B. Butts, and K. Høgh Jensen (1999), Aqueous flow and transport in analog systems of fractures embedded in permeable matrix, Water Resources Research, 35(3), 719-729.
5. Mortensen, A.P., K. Høgh Jensen, T.O. Sonnenborg, and E. Arvin (2000), Laboratory and numerical investigations of air sparging using MTBE as a tracer, Ground Water Monitoring and Remediation, 20(4), 87-95, fall 2000.
6. Schmidt, R., J. Gudbjerg, T.O. Sonnenborg, and K. Høgh Jensen (2002), Removal of NAPLs from the unsaturated zone using steam: prevention of downward migration by injecting mixtures of steam and air, Journal of Contaminant Hydrology, 55, 233-260.
7. Sonnenborg, T.O., B.S.B. Christensen, P. Nyegaard, H.J. Henriksen, and J.C. Refsgaard (2003), Transient modeling of regional groundwater flow using parameter estimates from steady-state automatic calibration, Journal of Hydrology, 273, 188-204
8. Henriksen, H.J., L. Troldborg, P. Nyegaard, T.O. Sonnenborg, J.C. Refsgaard, and B. Madsen (2003), Methodology for construction, calibration and validation of a national hydrological model for Denmark, Journal of Hydrology, 280, 52-71.
9. Harrar, W.G., T.O. Sonnenborg, and H.J. Henriksen (2003), Capture zone, travel time, and solute-transport predictions using inverse modeling and different geological models, Hydrogeology Journal, 11(5), 536 – 548.
10. Gudbjerg, J., T.O. Sonnenborg, and K. Høgh Jensen (2004), Remediation of NAPL below the water table by steam induced heat conduction. Journal of Contaminant Hydrology, 72, 207-225.
11. Gudbjerg, J., O. Trötschler, A. Färber, T.O. Sonnenborg, and K. Høgh Jensen (2004), On spurious water flow during numerical simulation of steam injection into water-saturated soil. Journal of Contaminant Hydrology, 75, 297-318.
12. Gudbjerg, J., T. Heron, T.O. Sonnenborg, and K. Høgh Jensen (2005), Three-dimensional numerical modeling of steam override observed at a full-scale remediation of an unconfined aquifer. Ground Water Monitoring and Remediation, 25(3), 116-127.
13. Høier, C.K., T.O. Sonnenborg, K.H. Jensen, C. Kortegaard, and M.M. Nasser (2007), Experimental investigation of pneumatic soil venting, Journal of Contaminant Hydrology, 89 (1-2), 29-47.
14. Roosmalen, L.v., B.S.B. Christensen, and T.O. Sonnenborg (2007), Regional differences in climate change impacts on groundwater and stream discharge in Denmark, Vadose Zone Journal, 6, 554-571, doi:10.2136/vzj2006.0093.
15. Seifert, D., T.O. Sonnenborg, P. Scharling, and K. Hinsby (2007), Use of alternative conceptual models to assess the impact of a buried valley on groundwater vulnerability, Accepted for publication in Hydrogeology Journal.
16. Høier, C.K., T.O. Sonnenborg, K. Høgh Jensen, and J. Gudbjerg (2007), Numerical investigation of pneumatic soil vapor extraction, Submitted to Journal of Contaminant Hydrology.
17. Roosmalen, L.v., T.O. Sonnenborg, and K.H. Jensen (2009), The impact of climate and land-use changes on the hydrology of a large-scale agricultural catchment, Water Resources Research., 45, 1-18, doi:10.1029/2007WR006760.
18. Bonnesen, E., F. Larsen, T.O. Sonnenborg, K. Klitten, and L. Stemmerik (2009), Deep saltwater in Chalk formations of North-West Europe: Origin, interface characteristics and development over geological time, Accepted for publication in Hydrogeology Journal.
19. Scharling, P., E.S. Rasmussen, T.O. Sonnenborg, P. Engesgaard, and K. Hinsby (2009), 3D regional scale hydrostratigraphical modeling based on sequence stratigraphical methods, Accepted for publication in Hydrogeology Journal.