Peter Ashmore

Professor

Ledgley

Contact Information

Office: Room 1405, SSC
Tel: 519 661-2111, 85026
Fax: 519 661-3750
E-mail: pashmore@uwo.ca

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.

Publications & Supervised Graduate Students and Theses Titles

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. https://doi.org/10.5194/esurf-7-97-2019.

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. https://doi.org/10.1002/esp.4511.

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. https://doi.org/10.1002/2017WR022438.

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. https://doi.org/10.5194/hess-2017-285.

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. http://dx.doi.org/10.1016/j.geomorph.2016.06.040.

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.

Liu, X., Parker, G., Czuba, J., Oberg, K., Mier, J.M., Best, J.L., Parsons, D.R., Ashmore, P. and Garcia, M.H. (2012) 'Sediment Mobility and Bed Armoring in the St. Clair River: Insights from hydrodynamic modeling.' Earth Surface Processes and Landforms 37: 957-970.

Czuba, J.A., Best, J.L., Oberg, K.A., Parsons, D.R., Jackson, R.P., Garcia, M.H. and Ashmore, P. (2011) 'Bed morphology, sediment transport and flow structure at the outlet of Lake Huron and in the upper St. Clair River.' Journal of Great Lakes Research 37: 480-493.

Ashmore, P., Bertoldi, W. and Gardner, J.T. (2011) 'Active width of gravel-bed braided rivers.' Earth Surface Processes and Landforms 36: 1510-1521.

Gardner, J.T. and Ashmore, P. (2011) 'Geometry and grain size characteristics of the basal surface of a braided river deposit.' Geology 39: 247-250.

Ashmore, P. (2009) 'The intensity and characteristic length of braided channel patterns.' Canadian Journal of Civil Engineering 36(10): 1656-1666.

Bertoldi, W., Ashmore, P. and Tubino, M. (2009) 'A method for estimating the mean bed load flux in braided rivers.' Geomorphology 109, 330-340.

Hundey, E. and Ashmore, P. (2009) 'Length scale of braided river morphology.' Water Resources Research 45: W08409.

Egozi, R. and Ashmore, P. (2009) 'Experimental analysis of braided channel pattern response to increased discharge.' Journal of Geophysical Research-Earth Surface 114: F02012.

Ashmore, P., Biron, P., Eaton, B. and Rennie, C. (2009) 'Canadian research on fluvial sediment transport since 2003.' Canadian Water Resources Journal 34: 149-162.

Egozi, R. and Ashmore, P. (2008) 'Defining and measuring braiding intensity.' Earth Surface Processes and Landforms 33, 2121-2138.

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.

Books Authored

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.

Supervised Graduate Students and Theses Titles

PhD Students Year Title
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
MSc Students Year Title
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

Teaching

GEO 3334A - Geomorphology of River Channels

GEO 9998 - Debates in Geographic Thoughts