EGU-GM Online Seminars in Geomorphology
Program (Fall 2022):
Abstract: Some recent publications suggest that we could use the luminescence signal to document and quantify surface processes, sources and sediment transport (McGuire and Rhodes, 2015; Gray et al.,2018; Sawakuchi et al., 2018; Guyez et al., 2022). In the project to be presented, we use the single-grain post-infrared luminescence (SG-pIRIR) protocol to study sediment transport in floodplains. The single-grain approach is well-suited to study fluvial deposits, which often exhibit a large scatter in the luminescence signal distribution due to heterogeneous bleaching ( zeroing) of grains by sunlight exposure prior to burial. We took advantage of these heterogeneities and used the distribution of luminescence signal as a tool to quantify transport processes. We measured modern sediment samples from the Rakaia and Waimakariri rivers in the South Island of New Zealand. Then, using a numerical model that simulates the successive movement and evolution of the luminescence signal along the river, we were able to well reproduce natural observations for transport distances of sand-sized river particles on the order of 2-10 kilometers and storage times of particles in the floodplains of several decades.
Day Month 2022 - Speaker (University of Blabla) "Title"
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