Sedimentological impact of a high magnitude, low-frequency flood in a braided river revealed from sequential GPR surveys

Parker, N.O., Sambrook-Smith, G.H., ASHWORTH, PHILIP, Best, J.L., Bridge, J.S., Lane, S.N., Lunt, I.A. and Simpson, C.J. (2008) Sedimentological impact of a high magnitude, low-frequency flood in a braided river revealed from sequential GPR surveys In: Proceedings of the 12th International Conference on Ground Penetrating Radar, Birmingham, UK.

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Abstract

Integrated aerial photography and GPR profiling has been used to explore the surface and subsurface evolution of braid bars within the South Saskatchewan River, Canada 2004-2007. Following a large flood in 2005, areas of a kilometre-long braid bar experienced incision and the creation of new unit bars. Subsequent low-magnitude, high-frequency flows during 2006 produced a further new central unit bar. Analysis of GPR profiles shows the presence of bar margin deposits in the subsurface relating to the unit bars produced in flood conditions and low-magnitude high-frequency flows. Quantitative comparisons of deposits reveal that the bar margin deposits formed during the large flood are similar in scale to the low-magnitude, high-frequency deposits with respect to the height and width of individual strata. However, stratal angles appear steeper in bar margin deposits produced by the low-magnitude, high-frequency events.

Item Type:Contribution to conference proceedings in the public domain ( Full Paper)
Additional Information:© University of Birmingham
Subjects:F000 Physical Sciences > F800 Physical Geography and Environmental Sciences > F820 Geomorphology
F000 Physical Sciences > F800 Physical Geography and Environmental Sciences > F840 Physical Geography
Faculties:Faculty of Science and Engineering > School of Environment and Technology > Applied Geosciences
Faculty of Science and Engineering > School of Environment and Technology
ID Code:7169
Deposited By:Converis
Deposited On:17 May 2010
Last Modified:22 Oct 2013 13:02

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