Dune-Phase Fluvial Transport and Deposition Model of Gravelly Sand

  1. Michael D. Blum2,
  2. Susan B. Marriott3 and
  3. Suzanne F. Leclair4
  1. Maarten G. Kleinhans

Published Online: 17 MAR 2009

DOI: 10.1002/9781444304350.ch5

Fluvial Sedimentology VII

Fluvial Sedimentology VII

How to Cite

Kleinhans, M. G. (2005) Dune-Phase Fluvial Transport and Deposition Model of Gravelly Sand, in Fluvial Sedimentology VII (eds M. D. Blum, S. B. Marriott and S. F. Leclair), Blackwell Publishing Ltd., Oxford, UK. doi: 10.1002/9781444304350.ch5

Editor Information

  1. 2

    Baton Rouge, Louisiana, USA

  2. 3

    School of Geography and Environmental Management, University of the West of England, Bristol BS16 1QY, UK

  3. 4

    Department of Earth and Environmental Sciences, Tulane University, Dimwiddie Hall, New Orleans, LA 70118, USA

Author Information

  1. Utrecht University, Faculty of Geography, Department of Physical Geography, P.O. Box 80115, 3508 TC Utrecht, The Netherlands

Publication History

  1. Published Online: 17 MAR 2009
  2. Published Print: 15 FEB 2005

Book Series:

  1. Special Publication Number 35 of the International Association of Sedimentologists

Book Series Editors:

  1. Ian Jarvis

Series Editor Information

  1. School of Earth Sciences and Geography, Centre for Earth and Environmental Science Research, Kingston University, Penrhyn Road, Kingston-upon-Thames KT1 2EE, UK

ISBN Information

Print ISBN: 9781405126519

Online ISBN: 9781444304350

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Keywords:

  • dune-phase fluvial transport and deposition model of gravelly sand;
  • cross-bedded deposits and lag deposits;
  • flume experiments;
  • dune height and sediment transport measurements;
  • gravelly layers in the Rhine;
  • process model of vertical sorting

Summary

The importance and role of sorting processes in dune-phase bedload transport and deposition is demonstrated with flume experiments, vibracores from the River Rhine (The Netherlands) and with sediment transport and dune data from the River Rhine. The entrainment and deposition depth of the sediment depend on dune trough levels below the average bed level and therefore on the dune height. As bedload sediment transport depends partly on grain size, it will be dependent upon the relict vertical sorting left in the bed by former discharge waves. The vertical sorting is created by sorting in grain flows on the lee side of dunes and by gravel lag formation in the dune troughs. Based on these principles, a simple reach-representative process model is developed for the prediction of bed sediment reworking, vertical sorting and deposition by dunes. The model is applied to two successive discharge waves of different magnitude, and predicts qualitatively the same vertical sorting characteristics as observed in the vibracores from the River Rhine (The Netherlands) after two successive discharge waves. The effect of the sorting on the sediment transport, and how to include this feedback in future models, is discussed.