Peter Ashmore

Undergraduate Chair

Peter Ashmore

Contact Information

Office: Room 1405, SSC
Tel: 519 661-2111, 85026

Research Areas

Fluvial geomorphology, sediment transport

Research Interests

Recent and current projects include: bed material transport in gravel rivers and mechanics of braided rivers (field site in Canadian Rockies plus small-scale model studies); stream morphology, land-use impacts on river systems, stream habitat and stream channel design (southern Ontario); regional denudation and sediment sources in glaciated landscapes; climate change impacts on fluvial processes in Canada.


GEO 1300 – Introduction to the Physical Environment

GEO 2330 – Geomorphology & Hydrology

GEO 3334 – Geomorphology of River Channels

GEO 9998 - Debates in Geographic Thought

Supervised Graduate Students and Theses Titles

PhD Students

  • C. Dawson (Current) Evaluating Terrain Surface Complexity of Designed Rivers
  • L. Middleton (Current) Braided river dynamics
  • S. Peirce (2017) Morphological Active width and bedload flux in gravel-bed braided rivers
  • J.T. Gardner (2009) Morpho-dynamics and sedimentology of confluences in gravelly braided rivers
  • R. Egozi (2006) Channel pattern variation in braided rivers
  • A. Doeschl (2002) Assessing braided river dynamics with a cellular model
  • R. Pryce (2001) Morphological control of bedload transport in modeled gravel-bed rivers
  • D. Boyes (1999) Morphometry and lake development on the Mackenzie Delta, NMT

Masters Students

  • V. Barlow (Current) Geomorphology; GIS
  • K. Goguen (Current) The impacts of urbanization on in-channel large wood
  • M. Sauro (Current) Sediment transport rates in a large riverbed- San Juan River, Vancouver Island
  • R. McQueen (2019) Sediment supply and sediment transportation dynamics
  • D. Barr (2017) The Effects of Urbanization on Channel Morphology in a Small Catchment
  • J. Howett (2017) Fluvial Geomorphology
  • L. Middleton (2017) Geomorphology
  • T. Hrytsak (2012) Alluvial Cover Dynamics in a Semi-alluvial Channel: A Case Study of Medway Creek, London, ON
  • N. Sampson (2011) The Use of Geomorphic Principles in Natural Channel Design: The State of River Restoration Practice in Southern Ontario, Canada
  • J. McDonald (2011) Response of River Channel Morphology to Urbanization: The Case of Highland Creek, Toronto, Ontario, 1954-2005
  • M. Ferencevic (2008) Stream power analysis for stream stability assessment
  • F. Varkaris (2002) Variability in sediment transport estimates, Sunwapta River
  • S. Baxter (2001) Use of stream for power for assessing stream channel stability
  • J.B. Lindsay (2000) Error in measurement of river bed topography and topographic change
  • G.E. Foster (1998) Morphology of three semi-alluvial stream channels in southern Ontario
  • B.D. Kussner (1995) Variation of bedload transport in Sunwapta River, Alberta
  • D. Jackson (1994) The sedimentology of braided gravel-bed rivers
  • L.C. Chew (1994) Channel adjustments in a pro-glacial stream
  • J.J.W. Luce (1994) Confluence zone sedimentation processes
  • J. Goff (1991) Braiding: bed sediment transport and morphological change
  • F.M. Conly (1990) Patterns of bar development and sand-flat initiation in the South Saskatchewan River


Refereed Journals

Leduc, P., Peirce, S., Ashmore, P. (2019) 'Short Communication: Challenges and applications of structure-from-motion photogrammetry in a physical model of a braided river.' Earth Surface Dynamics. 7, 97-106.

Peirce, S., Ashmore, P., Leduc, P. (2019) 'Evolution of grain size distributions and bed mobility during hydrographs in gravel-bed braided rivers.' Earth Surface Processes and Landforms. 44: 304– 316.

Middleton, L., Ashmore, P., Leduc, P., Sjogren, D. (2018) 'Rates of planimetric change in a proglacial gravel-bed braided river: field measurement and physical modeling.' Earth Surface Processes and Landforms. DOI:10.1002/esp.4528.

Peirce, S., Ashmore, P., Leduc, P. (2018) 'Evolution of grain size distributions and bed mobility during hydrographs in gravel-bed braided rivers'. Accepted with revisions, January 2018. Earth Surface Processes and Landforms. 43, 2371–2383. DOI: 10.1002/esp.4400.

Peirce, S., Ashmore, P., Leduc, P. (2018) 'Variability in the morphological active width: results from physical models of gravel-bed braided rivers.' Earth Surface Processes and Landforms. DOI: 10.1002/esp.4400.

Ashmore, P., Peirce, S., & Leduc, P. (2018) 'Expanding the “Active Layer”: Discussion of Church and Haschenburger (2017) What Is the “Active Layer”?' Water Resources Research 53, 5–10, Doi:10.1002/2016WR019675. Water Resources Research, 54, 1425–1427.

Leduc, P., Ashmore, P. Sjogren, D. (2017) 'Technical note: Ground-based remote sensing of a mountain stream: measuring stage and water width using a simple time-lapse camera.' Hydrology and Earth System Science.

Gardner, T., Ashmore, P., Leduc, P. (2017) 'Morpho-sedimentary characteristics of proximal gravel braided river deposits in a Froude-scaled physical model.' Sedimentology, 65, 877-896. DOI:10.1111/sed.12409.

Pike, L., Gaskin, S., and Ashmore, P. (2017) 'Flume tests on fluvial erosion mechanisms in till‐bed channels.' Earth Surf. Process. Landforms, 43: 259–270. DOI: 10.1002/esp.4240.

Ashmore, P. and Dodson, B. (2016) 'Urbanizing physical geography.' The Canadian Geographer. DOI: 10111/cag12318.

Thayer, J.B., Ashmore, P. (2016) 'Floodplain morphology, sedimentology, and development processes of a partially alluvial channel.' Geomorphology, 269, 160-174.

Métivier, F., Devauchelle, O., Chauvet, H., Lajeunesse, E., Meunier, P., Blanckaert, K., Ashmore, P., Zhang, Z., Fan, Y., Liu, Y., Dong, Z., Ye, B. (2016) 'Geometry of meandering and braided gravel-bed threads from the Bayanbulak Grassland, Tianshan, P. R. China.' Earth Surface Dynamics, 4, 273-283.

Leduc, P. Ashmore, P., Gardner, J.T. (2015) 'Grain sorting in the morphological active layer of a braided river physical model.' Earth Surface Dynamics, 3, 577-585.

Ashmore, P. (2015) Towards a socio-geomorphology of rivers. Geomorphology, 241, 149-156.

Bennett, S., Ashmore, P., McKenna-Neuman, C. (2015) 'Transformative geomorphic research using laboratory experimentation.' Geomorphology, 244, 1-8.

Kasprak, A., Wheaton, J, Ashmore, P., Hensleigh, J., Peirce, S. (2015) 'The relationship between particle travel distance and channel morphology: results from physical models of braided rivers.' Journal of Geophysical Research-Earth Surface, 120, 55–74.

Ashmore, P. and Rennie, C.D. (2012) 'Gravel-bed rivers: from particles to patterns.' Earth Surface Processes and Landforms 38: 217-220.

Vocal-Ferencevic, M. and Ashmore, P. (2012) 'Creating and evaluating digital elevation model-based stream-power map as a stream assessment tool.' River Research and Applications 28(9): 1394-1416.


Chapters in Books

Ashmore, P. (2018) 'Transforming Toronto’s rivers: a socio-geomorphic perspective' in R. Lave,  C. Biermann, S. Lane (Eds). Handbook of Critical Physical Geography (Palgrave, New York) 23: 485- 511.

McKenna-Neumann, C., Ashmore, P., Bennett, S. (2013) 'Laboratory and Experimental Geomorphology: Examples from Fluvial and Aeolian Systems' in Treatise on Geomorphology eds J. Shroder, A.R. Orme and D. Sack (Academic Press: San Diego, CA) 1: 325-328 Invited.

Ashmore, P. (2013) 'Morphology and Dynamics of Braided Rivers' in Treatise on Geomorphology eds J. Schroder Jr. and E. Wohl (Academic Press, San Diego) 9: 289-312.

Ashmore, P. and Garcia, M. (2009) 'St. Clair River Sediment Regime' in Impacts on Upper Great Lakes Water Levels: St. Clair River Final Report (International Upper Great Lakes Study (IUGLS), International Joint Commission) 4, 57-84.

Ashmore, P. and Gardner, J.T. (2008) 'Unconfined confluences as elements of braided river morphology' Submitted for River Confluences, Tributaries and the Fluvial Network eds S. Rice, A. Roy and B. Rhoads (Wiley, Chichester) 7, 119-143.

Authored Books

Gravel-bed Rivers: Processes, tools environments, (2012). M. Church, A. Roy, P. Biron (Editors); P. Ashmore, N. Bergeron, T. Buffin-Belanger, C. Rennie (Associate Editors), Chichester, Wiley Blackwell, 563p.