|Dept:||Geological And Atmospheric Sciences|
|Office:||356 Science |
2237 Osborn Dr
B.S. Iowa State University, 1983
Ph.D. University of Minnesota, 1989
My research is devoted primarily to understanding glaciers and the spectacular imprint they leave on the landscape. Glacier dynamics and landscape modification are particularly sensitive to processes at glacier beds, which is the focus of much of my effort. This research involves field experiments at modern glaciers, field measurements in formerly glaciated landscapes, laboratory experiments, and the formulation of models aimed at characterizing glacial processes.
Current and proposed projects include the following:
- Field and modeling studies of drumlin formation in Iceland
- Field studies of flute and crevasse-fill ridge formation in Iceland
- Use of magnetic till fabrics to infer deformation kinematics of soft beds and related landform genesis, with laboratory experiments to calibrate fabrics to strain characteristics
- Field studies of strain in glaciotectonically thrusted and folded sediments in Denmark
- Laboratory studies of glacier sliding, erosion, and sediment transport with a custom device that rotates a ring of ice (0.9 m O.D.) at the pressure-melting temperature over a rigid or deformable bed
- Laboratory studies of the rheology of temperate ice as a function of its water content
- Modeling of bedrock erosion by glaciers
- LiDAR-based studies of glacial landforms
This research is funded primarily by the National Science Foundation, through grants awarded by Earth Sciences and Polar Programs. Most of these projects include student research opportunities. Enquiries from prospective students are very welcome.
Iverson Lab - Recent Field Sites
Iverson Lab - Ring Shear Devices
Geol 474/574 - Glacial and Quaternary Geology
Geol 479/579 - Surficial Processes
Typically more than half of students enrolled in these courses are majors in environmental science, civil engineering, agronomy, or anthropology. Field trips that explore the landforms and Quaternary sediments of Iowa, Minnesota, and Wisconsin are routine and important elements of these courses.
Recent Publications (A full publication list can be found here.)
Benediktsson, Í.Ö., S.A. Jónsson, A. Schomacker, M.D. Johnson, Ó. Ingólfsson, L.K. Zoet, N.R. Iverson, and J. Stötter, 2016. Progressive formation of modern drumlins at Múlajökull, Iceland: stratigraphical and morphological evidence. Boreas, 45(4), 567-583.
McCracken, R.G., N.R. Iverson, Í.Ö. Benediktsson, A. Schomacker, L.K. Zoet, M.D. Johnson, T.S. Hooyer, and Ó.Ingólfsson, 2016. Origin of the active drumlin field at Múlajökull, Iceland: New insights from till shear and consolidation patterns. Quaternary Science Reviews, 148, 243-260.
Ugelvig, S. V., D. L. Egholm, and N.R. Iverson, 2016. Glacial landscape evolution by subglacial quarrying: A multiscale computational approach. Journal of Geophysical Research: Earth Surface, 121(11), 2042-2068.
Zoet, L. K. and N.R. Iverson, 2016. Rate‐weakening drag during glacier sliding. Journal of Geophysical Research: Earth Surface, 121(7), 1206-1217.
Ankerstjerne, S., N.R. Iverson, and F. Lagroix, 2015. Origin of a washboard moraine of the Des Moines Lobe inferred from sediment properties. Geomorphology, 248, 452-463.
Cline, M.D., N.R. Iverson, and C. Harding, 2015. Origin of washboard moraines of the Des Moines Lobe: I. Spatial analysis of LiDAR data. Geomorphology, 246, 570-578.
Iverson, N.R. and L.K. Zoet, 2015. Experiments on the dynamics and sedimentary products of glacier slip. Geomorphology, 244, 121-134.
Vreeland, N.P., N.R. Iverson, M. Graesch, and T.S. Hooyer, 2015. Magnetic fabrics of drumlins of the Green Bay Lobe. Quaternary Science Reviews, 112, 33-44.
Zoet, L.K. and N.R. Iverson, 2015. A double-valued drag relationship for basal sliding. Journal of Glaciology, 61(225), 1-7.
Becker, R.A., B. Tikoff, P.R. Riley, and N.R. Iverson, 2014. Pre-existing fractures and the formation of an iconic American landscape: Toulumne Meadows, Yosemite National Park, USA. GSA Today, 24(11), 4-10.
Moore, P.L., J.P. Winberry, N.R. Iverson, K.A. Christianson, S. Anandakrishnan, M. Jackson, M.E. Mathison, and D. Cohen, 2013. Glacier slip and seismicity induced by surface melt. Geology, 41(12), 1247-1250.
Byers, J., D. Cohen, and N.R. Iverson, 2012. Subglacial clast-bed contact forces. Journal of Glaciology, 207, 89-98.
Gentoso, M.J., E.B. Evenson, K.P. Kodama, N.R. Iverson, R.B. Alley, C. Berti, and A. Kozlowski, 2012. Exploring till-bed kinematics using magnetic and pebble fabrics: North-central, New York. Boreas, 41, 31-41.
Hooyer, T.S., D. Cohen, and N.R. Iverson, 2012. Control of glacial quarrying by bedrock joints. Geomorphology, 153, 91-101.
Iverson, N.R., 2012. A theory of glacial quarrying for landscape evolution models. Geology, 40(8), 679–682.
Iverson, N.R., and M. Person, 2012. Glacier-bed geomorphic processes and hydrological conditions relevant to nuclear waste disposal. Geofluids, 12(1), 38-57.
Moore, P.L., N.R. Iverson, K.T. Uno, M.P. Dettinger, K.A. Brugger, and P. Jansson, 2012. Entrainment and emplacement of englacial debris bands near the margin of Storglaciären, Sweden. Boreas, 42(1), 71-83.