Preprints
https://doi.org/10.5194/esurf-2018-64
https://doi.org/10.5194/esurf-2018-64

  03 Sep 2018

03 Sep 2018

Review status: this preprint has been withdrawn by the authors.

Theoretical Interpretation of the Exceptional Sediment Transport of Fine-grained Dispersal Systems Associated with Bedform Categories

Tian Zhao1, Qian Yu1, Yunwei Wang2, and Shu Gao3 Tian Zhao et al.
  • 1Ministry of Education Key Laboratory of Coast and Island Development, Nanjing University, Nanjing 210023, China
  • 2College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China
  • 3State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China

Abstract. Being a widespread source-to-sink sedimentary environment, the fine-grained dispersal system (FGDS) features remarkably high sediment flux, interacting closely with local morphology and ecosystem. Such exceptional transport is believed to be associated with changes in bedform geometry, which further demands theoretical interpretation. Using van Rijn (2007a) bed roughness predictor, we set up a simple numerical model to calculate sediment transport, classify sediment transport behaviors into dune and (mega-)ripple dominant regimes, and discuss the causes of the sediment transport regime shift linked with bedform categories. Both regimes show internally consistent transport behaviors, and the latter, associated with FGDSs, exhibits considerably higher sediment transport rate than the previous. Between lies the coexistence zone, the sediment transport regime shift accompanied by degeneration of dune roughness, which can considerably reinforce sediment transport and is further highlighted under greater water depth. This study can be applied to modeling of sediment transport and morphodynamics.

This preprint has been withdrawn.

Tian Zhao et al.

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Tian Zhao et al.

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Short summary
In many coastal, riverine, deltaic, marine, and subglacial systems, plentiful fine bed sediment is produced and moved to change the surface features and surrounding environments along its pathway. Our numerical research shows that, in these systems, weakened bed level changes can reduce bed friction and produce higher sediment yield, whose effects can be amplified under greater water depth. This finding can help predict sediment movement and bed level changes of water channels.