The effect of transverse bed slope and sediment mobility on bend sorting

S.A.H. Weisscher, Anne Baar, Wim Uijttewaal, MG Kleinhans

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Lateral sorting (= bend sorting) is observed in  natural meanders, where the inner and outer  bend are fairly fine and coarse, respectively  (e.g. Julien and Anthony, 2002; Clayton and  Pitlick, 2007). This is caused by the mass  differences between grains on a transverse  slope, leading to coarser grains being dragged  down net more than finer grains (Ikeda et al.,  1987). The slope of the transverse bed  influences the degree of bend sorting greatly.  Also vertical sorting occurs. Grainflows at  the lee side of dunes result in a net fining  upward trend (Kleinhans, 2005). The degree of  vertical sorting depends on flow velocity and  sediment mixture characteristics.  Most previous studies focused on the  development of the transverse slope using  small ranges of uniform sediment, so spatial  sorting was absent. Yet, it was argued that  there is a feedback mechanism between bend  sorting and the transverse slope (Ikeda et al.,  1987). So, it is of key importance to attain  better understanding of how sorting in river  bends comes about, which can improve current  numerical models.  It is the objective of this study to examine  experimentally the effect of transverse bed  slope and sediment mobility on spatial sorting  of bed load in a meander. 

Original languageEnglish
Publication statusPublished - 2017
EventNCR-Days 2017 - Wageningen, Netherlands
Duration: 1 Feb 20173 Feb 2017


ConferenceNCR-Days 2017
OtherNetherlands Centre for River Studies is a corporation of the Universities of Delft, Utrecht, Nijmegen, Twente and Wageningen, UNESCO-IHE, RWS-WVL and Deltares

Bibliographical note

A.J.F. Hoitink, T.V. de Ruijsscher, T.J. Geertsema, B. Makaske, J. Wallinga, J.H.J. Candel, J. Poelman (Eds.)
NCR days 2017, Febr. 1-3, 2017. Book of abstracts, NCR publication 41-2017.


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