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Discussion papers | Copyright
https://doi.org/10.5194/esurf-2018-30
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 23 Apr 2018

Research article | 23 Apr 2018

Review status
This discussion paper is a preprint. A revision of the manuscript was accepted for the journal Earth Surface Dynamics (ESurf).

Reconstructing lateral migration rates in meandering systems; a novel Bayesian approach combining OSL dating and historical maps

Cindy Quik and Jakob Wallinga Cindy Quik and Jakob Wallinga
  • Soil Geography and Landscape Group, Wageningen University, the Netherlands

Abstract. Identifying lateral migration rates of meandering rivers is relevant both for fluvial geomorphology and to support river management. Lateral migration rates for contemporary meandering systems are often reconstructed based on sequential remote sensing images or historical maps, however the time frame for which these sources are available is limited and hence likely to represent fluvial systems subjected to human influence. Here, we propose to use scroll bar sequences as an archive to look further back in time using optically stimulated luminescence (OSL) dating of sand-sized quartz grains. We develop a modelling procedure for the joint Bayesian analysis of (OSL) dating results and historical map data. The procedure is applied to two meanders from the Overijsselse Vecht, a medium-sized sand-bed river in The Netherlands. We obtained 9 samples for OSL dating from scroll bars, and combined OSL dating results with historical map data for the period 1720–1901AD. The procedure we propose here incorporates strengths of both data types for reconstructing fluvial morphodynamics over longer timeframes. Using an iterative modelling approach, we translate spatial uncertainty of historical maps into temporal uncertainty of channel position required for Bayesian deposition modelling. Our results indicate that meander formation in the Overijsselse Vecht system started around 1400 AD, and lateral migration rates were on average 2.6 and 0.9m/y for the two investigated bends, until river channelization around 1900 AD.

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Cindy Quik and Jakob Wallinga
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Cindy Quik and Jakob Wallinga
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Short summary
Identifying contemporary river migration rates is often based on aerial photos or recent topographical maps. Here, we propose to use river sediments as an archive to look further back in time using optically stimulated luminescence (OSL) dating, and develop a modelling procedure for the joint analysis of dating results and historical maps. The procedure is applied to the Overijsselse Vecht river in The Netherlands, and we show that the river migrated with 0.9–2.6 m/y between 1400–1900 AD.
Identifying contemporary river migration rates is often based on aerial photos or recent...
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