Menntun
Sc.D. í straumfræði. Massachusetts Institute of Techonology (MIT)
M.Sc. í byggingarverkfræði. Massachusetts Institute of Techonology (MIT)
B.Sc. í byggingarverkfræði. Háskóli Íslands

Starfsferill
2007-  Deilarforseti Tækni- og verkfræðideilar Háskólans í Reykjavík
2005-2007 Aðstoðarframkvæmdastjóri, VST hf.
2000-2005 Yfirverkfræðingur umhverfis- og þróunarsviðs VST hf.
1998-2007 Hluthafi í VST hf.
1995-2000 Sérfræðingur í straumfræði, VST hf.
1994-1995 Sjálfstætt starfandi verkfræðingur
1993-1998 Dósent (50%) í byggingarverkfræði, Háskóli Íslands
1991-1994 Verkfræðingur, Verkfræðistofan Vatnaskil hf.
1986-1991 Rannsóknarstörf, MIT

Sérsvið
Straumfræði og umhverfisverkfræði

Aðildarfélög
Verkfræðingafélag Íslands (VFÍ)
American Society of Civil Engineers (ASCE)
American Geophysical Union (AGU)
International Association for Hydraulic Research (IAHR)

Ritstörf
Tímaritsgreinar
Melville,W.K., Tomasson,G.G. & Renouard, D.P., 1989,  On the stability of Kelvin waves, Journal of Fluid Mechanics, 206, 1-23.
Tomasson,G.G. & Melville W.K., 1990, Nonlinear and dispersive  effects in Kelvin waves, Physics of Fluids (A), 2(2), 189-193.
Tomasson, G.G. & Melville, W.K., 1991, Flow past a constriction in a channel: a modal description,  Journal of Fluid Mechanics, 232, 21-45.
Tomasson, G.G. & Melville, W.K., 1991, Geostrophic adjustment in a channel. Nonlinear and dispersive effects,  Journal of Fluid Mechanics, 241, 23-57.
Renouard, D.P., Tomasson, G.G. & Melville, W.K., 1991, An experimental and numerical study of nonlinear internal waves, Physics of Fluids (A), 5(6), 1401-1411.
Tómasson, G.G. & Kjaran, S.P., 1993, Setflutningar í Mývatni, Árbók Verkfræðingafélags Íslands 1992/93, 294-305 (In Icelandic).
Jóhannesson, T., Pétursson, O., Egilsson, J.G. & Tómasson, G.G., 1999, Snjóflóðið á Flateyri 21. Febrúar 1999 og áhrif varnargarða ofan byggðarinnar, Náttúrufræðingurinn, 69 (1), 3-10.
Tómasson, G.G. & Hestnes, E., 2000, Slushflow Hazard and Mitigation in Vesturbyggd, Nordic Hydrology, Vol. 31 (4/5), 399-410.
Bollaert, E., Tómasson, G.G., Gisiger J-P & Schleiss, A., 2003, The Kárahnjúkar Hydroelectric Project: Transient analysis of the waterways system, Wasser Energie Luft, 95. Jahrgang, Heft 3/4, 122-124
Hákonardóttir, K.M., Hogg, A.J., Jóhannesson, T. & Tómasson, G.G., 2003, A laboratory study of the retarding effects of breaking mounds on snow avalanches, Journal of Glaciology, 49 (165), 191-200
Tomasson, G.G., Gardarsson, S.M., Petry, B. & Stefansson, B., 2006, Design challenges and solutions for the Kárahnjúkar Spillway, Hydropower and dams, Issue 5, 2006.
Tómasson, G.G., Garðarsson, S.M. & Leifsson, Þ.S., 2006, Flóðvirki Kárahnjúkavirkjunar við Hálslón, Árbók Verkfræðingafélags Íslands og Tæknifræðingafélags Íslands, 2006, 323-330 (In Icelandic)

Hákonardóttir, K.M., Tómasson, G.G., Kaelin, J. & Stefánsson, B., 2009, The hydraulic roughness of unlined and shotcreted TBM-bored tunnels in volcanic rock: In situ observations and measurements at Kárahnjúkar Iceland, Tunnelling and Underground Space Technology, 24 (2009), 706-715

Ráðstefnugreinar
Sigurðsson,S, Kjaran,S.P. & Tómasson.G.G., 1988,  A simple staggered finite element scheme for simulation of shallow water free surface flows, In "Vol. 1, Modelling surface and subsurface flows.  Proceedings of the VII International Conference on Computational methods in Water Resources", pp. 329-335, Elsevier.
Tómasson, G.G, Hólm, S.L., Kjaran, S.P., Viggósson, G. & Sigurðarson, S., 1994, Hydrodynamic modelling of the Tidal Inlet of Hornafjörður, In "Proceedings of the Hornafjörður International Coastal Symposium", edited by G. Viggósson, pp. 249-258, Icelandic Harbour Authority.
Tómasson, G.G, Hólm, S.L., Kjaran, S.P., Viggósson, G. & Sigurðarson, S., 1994, Applications of the Hydrodynamic Model of the Tidal Inlet of Hornafjörður, In "Proceedings of the Hornafjörður International Coastal Symposium", edited by G. Viggósson, pp. 259, Icelandic Harbour Authority.
Tómasson, G.G & Elíasson, J., 1995, Numerical modelling of tides around Iceland, In "Computer Modelling of Seas and Coastal Regions II", edited by C.A. Brebbia, L. Traversoni & L.C. Wrobel, pp. 291-298, Computational Mechanics Publications.
Tómasson, G.G, Gíslason, K. & Karlsson, Th.., 1997, A storm surge model for the coast of Iceland, In "Computer Modelling of Seas and Coastal Regions III", edited by J.R. Acinas & C.A. Brebbia, pp. 85-94, Computational Mechanics Publications.
Tómasson, G.G., Sigurðsson, F. & Rapin, F., 1998, The avalanche situation in Neskaupstaður, Iceland.  A preliminary defensive plan, In “25 years of Snow Avalanche Research, Voss 12-16 May 1998”, edited by Hestnes, E., pp. 283-287, Norwegian Geotechnical Institute, Publication no. 203.
Sigurðsson, F., Tómasson, G.G. & Sandersen, F., 1998, Avalance defences for Flateyri, Iceland.  From hazard evaluation to construction of defences, In “25 years of Snow Avalanche Research, Voss 12-16 May 1998”, edited by Hestnes, E., pp. 254-258, Norwegian Geotechnical Institute, Publication no. 203.
Tómasson, G.G. & Hestnes, E., 1999, Slushflow hazard and mitigation in Vesturbyggð, Northwest Iceland, In “Proceedings of the Northern Research Basins.  Twelfth International sumposium and workshop.  Reykjavík, Kirkjubæjarklaustur and Höfn, Hornafjörður, Iceland, August 23-27, 1999”, edited by Elíasson, J., pp. 334-343, Iceland University Press.
Gardarsson, S.M. & Tomasson, G.G., 2002,  Water level changes due to the Karahnjukar Hydroelectric Project in Eastern Iceland.  In “River Flow 2002 - Proceedings of the International Conference on Fluvial Hydraulics”, D. Bousmar & Y. Zech, Editors.  Netherland.
Bollaert, E., Tómasson, G.G., Gisiger, J-P & Schleiss, A, 2002, The Kárahnjúkar Hydroelectric Project: Transient analysis of the waterways system. In “Proceedings of the Hydraulic Machinery and Systems 21st IAHR Symposium, September 9-12, 2002, Lausanne”.
Bollaert, E., Tómasson, G.G., Gisiger, J-P & Schleiss, A, 2002, The Kárahnjúkar Hydroelectric Project: The influence of free-flow conditions in the Jökulsá tunnel on the transient analysis of the waterways system. In “Proceedings of the Hydraulic Machinery and Systems 21st IAHR Symposium, September 9-12, 2002, Lausanne”.
Pálmason, P.R., Sigtryggsdóttir, F.G., Sigurðsson, F. & Tómasson, G.G., 2004, Snow avalanche training dike at Flateyri, Iceland, In “Proceedings: Fifth International Conference on Case Histories in Geotechnical Engineering New York, NY, April 13-17, 2004”, edited by Shamsher Prakash, New York
Tómasson, G.G., Ólafsson, H. & Rögnvaldsson, Ó, 2005, Meteorological and hydrological modeling of an extreme precipitation event in S-Iceland, In “Proceedings of the 28th International Conference on Alpine Meteorology (ICAM), May 23-27th 2005”, p. 558-561.
Tómasson, G.G., Leifsson, Þ.S., Káradóttir, Ó.R., Sigurðsson, Ó, Hannesdóttir, L.B., Ólafsson, H. & Sveinsson, Ó.G.B., 2005, Combining an atmospheric weather model and a hydrological runoff model to correct flood records and predict probable maximum floods in the Þjórsá-Tungnaá river basin in Iceland, In “Proceedings of the XXXI IAHR Congress, Seoul, Korea, , September 11-16th 2005”, edited by Byong-Ho Jun, Sang-Il Lee, Il Won Seo, Gye-Woon Choi, pp. 3562-3572.
Tómasson, G.G. & Káradóttir, Ó.R., 2005, A two dimensional numerical model of astronomical tide and storm surge in the North Atlantic Ocean, In “Second International Coastal Symposium in Iceland at Höfn the Town of Hornafjörður, 5-8 June, 2005”, edited by G. Viggosson.
Tómasson, G.G. & Káradóttir, Ó.R., 2005, Applications of the two dimensional numerical model of astronomical tide and storm surge in the North Atlantic Ocean. In “Second International Coastal Symposium in Iceland at Höfn the Town of Hornafjörður, 5-8 June, 2005”, edited by G. Viggosson.
Tomasson, G.G., Gardarsson, S.M., Petry, B. & Stefansson, B., 2006, Spillway facilities for the Kárahnjúkar Dam in Eastern Iceland: Design challenges and solutions. In “Hydro 2006. Maximizing the benefits of Hydropower. Porto Carras, Greece, 25-27 September 2006”. Published by the International Journal on Hydropower & Dams.

Petry, B., Baumann, A., Tomasson, G.G. & Stefansson, B., 2006, Control of hydraulic transients in the power waterways of the Kárahnjúkar HEP in Iceland: Design challenges and solutions. In “Hydro 2006. Maximizing the benefits of Hydropower. Porto Carras, Greece, 25-27 September 2006”. Published by the International Journal on Hydropower & Dams.

Baumann, A., Tomasson, G.G, Soubrier, G.. & Stefansson, B., 2007, Free surface and pressurized flow regimes in a large water conveyance tunnel: The case of the Jökulsá Tunnel for the Kárahnjúkar HEP in Iceland. In “Hydro 2007. New approaches for a new era. Granada, Spain 18-19 October 2007”. Published by the International Journal on Hydropower & Dams.
Hakonardottir, K.M., Tomasson, G.G, Petry, B.. & Stefansson, B., 2007, Evaluating the hydraulic roughness of unlined TBM-bored water conveyance tunnels. In “Hydro 2007. New approaches for a new era. Granada, Spain 18-19 October 2007”. Published by the International Journal on Hydropower & Dams.
Hákonardóttir, K.M., Tómasson, G.G., Indriðason, H.D & Sigurðsson, F., 2008, The design of avalanche protection dams based on new design criteria: Three different case studies. In “International Symposium on Mitigative Measures against Snow Avalanches, Egilsstaðir, Iceland, March 11-14, 2008”, edited by Jóhannesson, T., Eiríksson, G., Hestnes, E & Gunnarsson, J., p. 78-84.
Hákonardóttir, K.M., Margreth, S., Tómasson, G.G., Indriðason, H.D & Þórðarson, S, 2008, Snow drift measures as protection against snow avalanches in Iceland. In “International Symposium on Mitigative Measures against Snow Avalanches, Egilsstaðir, Iceland, March 11-14, 2008”, edited by Jóhannesson, T., Eiríksson, G., Hestnes, E & Gunnarsson, J., p. 85-90.

Gardarsson, S.M., Tomasson, G.G., Sigtryggsdottir, F.G, Pálmason, P.R., and Stefansson, B., 2009, Kárahnjúkar dam spillway - Design and operational experience. In “Proceeding of 33rd International Association of Hydraulic Engineering & Research (IAHR) Biennial Congress, August 9-14, 2009, Vancouver, Canada”.
Tomasson, G.G., Gardarsson, S.M., Leifsson, Th.S and Stefansson, B., 2009, Flood design criteria for Kárahnjúkar dam – a glacially dominated watershed. In “Proceeding of 33rd International Association of Hydraulic Engineering & Research (IAHR) Biennial Congress, August 9-14, 2009, Vancouver, Canada”.
Hakonardottir, K.M., Tomasson, G.G. & Stefansson, B., 2009, The hydraulic roughness of TBM tunnels in basaltic and sedimentary rock: Measurements of headlosses in the Kárahnjúkar HEP, Iceland. In “Hydro 2009. Progress-Potential-Plans. Lyon, France 26-28 October 2009”. Published by the International Journal on Hydropower & Dams.

Ritgerðir
Tomasson.G.G. 1988, On the stability of long nonlinear Kelvin waves, S.M.-Thesis, Department of Civil Engineering, MIT.
Tomasson, G.G., 1991,  Nonlinear waves in a channel:  Three-dimensional and rotational effects,  Sc.D. - Thesis, Department of Civil Engineering, MIT.

Önnur ritstörf
Tómasson, G.G., 1994, Notkun straumfræðilegra reiknilíkana við mat á umhverfisáhrifum framkvæmda, In “Upp í vindinn, tímarit byggingarverkfræðinema”, pp. 26-28
Tómasson, G.G., 1996, Líkön til útreikninga á skriðlengd snjóflóða, In “Upp í vindinn, tímarit byggingarverkfræðinema”, pp. 52-54
Tómasson, G.G. & Sigurðsson, F., 1998, Snjóflóðavarnir á Flateyri, In “Sveitarstjórnarmál, 1.tbl. 1998”, pp. 29-33
Tómasson, G.G., 1998, Líkangerð af sjávarföllum og sjávarfallastraumum í hafinu umhverfis Ísland, In “Á Vatnaskilum. Dr. Jónas Elíasson, prófessor. Afmælisrit”, pp. 67-78, Iceland University Press.
Sigurðsson, F. & Tómasson, G.G., 2000, Snjóflóðavarnir á Drangagilssvæðinu í Neskaupstað, In “Tæknivísir”
Garðarsson, S.M. & Tómasson, G.G., 2004, Straumfræðileg hönnun yfirfalls við Kárahnjúkastíflu, In “Upp í vindinn, tímarit byggingarverkfræðinema”, pp. 26-28
Garðarsson, S.M. & Tómasson, G.G., 2005, Straumfræðilegt líkan af yfirfalli við Kárahnjúkastíflu, In “Upp í vindinn, tímarit byggingarverkfræðinema”, pp. 34-38

Tómasson, G.G., 2008, Tækni- og verkfræðideild Háskólans í Reykjavík, In “Tæknivísir, blað byggingartæknifræðinema, 32. árgangur”, pp. 45-47
Tómasson, G.G., 2008, Verkfræðinám við Háskólann í Reykjavík, In “Mekatróník 2008, útskriftarblað hátækniverkfræðinema, 1, árgangur”, pp. 22-23