Using both free surface effect and sediment transport mode parameters in defining the morphology of river dunes and their evolution to upper stage plane beds, doi: 10.1061/(ASCE)HY.1943-7900.0000873

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Abstract

Dunes are common bed forms in sand bed rivers and are of central interest in water management purposes. Due to flow separation and associated energy dissipation, dunes form the main source of hydraulic roughness. A large number of dune dimension data sets was compiled and analyzed in this study—414 experiments from flumes and the field—showing a significantly different evolution of dune height and length in flows with low Froude numbers (negligible free surface effects) and flows with high Froude numbers (large free surface effects). For high Froude numbers (0.32–0.84 ), relative dune heights are observed to grow only in the bed load dominant transport regime and start to decay for u ∗ /w s (suspension number) exceeding 1. Dunes in this case are not observed for suspension numbers greater than 2.5. For low Froude numbers (0.05–0.32), relative dune heights continue to grow from the bed load to suspended load dominant transport regime. Dunes in this case are not observed for suspension numbers greater than 5. It was concluded that for reliable predictions of dune morphology and their evolution to upper stage plane beds, it is essential to address both free surface effects and sediment transport mode.
Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalJournal of hydraulic engineering
Volume140
Issue number6
DOIs
Publication statusPublished - 2014

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Froude number
Sediment transport
sediment transport
dune
Rivers
river
Flow separation
Water management
bedload
Energy dissipation
Sand
Surface roughness
Hydraulics
parameter
effect
suspended load
bedform
river bed
energy dissipation
roughness

Keywords

  • IR-91813
  • METIS-290709

Cite this

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title = "Using both free surface effect and sediment transport mode parameters in defining the morphology of river dunes and their evolution to upper stage plane beds, doi: 10.1061/(ASCE)HY.1943-7900.0000873",
abstract = "Dunes are common bed forms in sand bed rivers and are of central interest in water management purposes. Due to flow separation and associated energy dissipation, dunes form the main source of hydraulic roughness. A large number of dune dimension data sets was compiled and analyzed in this study—414 experiments from flumes and the field—showing a significantly different evolution of dune height and length in flows with low Froude numbers (negligible free surface effects) and flows with high Froude numbers (large free surface effects). For high Froude numbers (0.32–0.84 ), relative dune heights are observed to grow only in the bed load dominant transport regime and start to decay for u ∗ /w s (suspension number) exceeding 1. Dunes in this case are not observed for suspension numbers greater than 2.5. For low Froude numbers (0.05–0.32), relative dune heights continue to grow from the bed load to suspended load dominant transport regime. Dunes in this case are not observed for suspension numbers greater than 5. It was concluded that for reliable predictions of dune morphology and their evolution to upper stage plane beds, it is essential to address both free surface effects and sediment transport mode.",
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author = "Suleyman Naqshband and Ribberink, {Jan S.} and Hulscher, {Suzanne J.M.H.}",
year = "2014",
doi = "10.1061/(ASCE)HY.1943-7900.0000873",
language = "English",
volume = "140",
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journal = "Journal of hydraulic engineering",
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AU - Naqshband, Suleyman

AU - Ribberink, Jan S.

AU - Hulscher, Suzanne J.M.H.

PY - 2014

Y1 - 2014

N2 - Dunes are common bed forms in sand bed rivers and are of central interest in water management purposes. Due to flow separation and associated energy dissipation, dunes form the main source of hydraulic roughness. A large number of dune dimension data sets was compiled and analyzed in this study—414 experiments from flumes and the field—showing a significantly different evolution of dune height and length in flows with low Froude numbers (negligible free surface effects) and flows with high Froude numbers (large free surface effects). For high Froude numbers (0.32–0.84 ), relative dune heights are observed to grow only in the bed load dominant transport regime and start to decay for u ∗ /w s (suspension number) exceeding 1. Dunes in this case are not observed for suspension numbers greater than 2.5. For low Froude numbers (0.05–0.32), relative dune heights continue to grow from the bed load to suspended load dominant transport regime. Dunes in this case are not observed for suspension numbers greater than 5. It was concluded that for reliable predictions of dune morphology and their evolution to upper stage plane beds, it is essential to address both free surface effects and sediment transport mode.

AB - Dunes are common bed forms in sand bed rivers and are of central interest in water management purposes. Due to flow separation and associated energy dissipation, dunes form the main source of hydraulic roughness. A large number of dune dimension data sets was compiled and analyzed in this study—414 experiments from flumes and the field—showing a significantly different evolution of dune height and length in flows with low Froude numbers (negligible free surface effects) and flows with high Froude numbers (large free surface effects). For high Froude numbers (0.32–0.84 ), relative dune heights are observed to grow only in the bed load dominant transport regime and start to decay for u ∗ /w s (suspension number) exceeding 1. Dunes in this case are not observed for suspension numbers greater than 2.5. For low Froude numbers (0.05–0.32), relative dune heights continue to grow from the bed load to suspended load dominant transport regime. Dunes in this case are not observed for suspension numbers greater than 5. It was concluded that for reliable predictions of dune morphology and their evolution to upper stage plane beds, it is essential to address both free surface effects and sediment transport mode.

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DO - 10.1061/(ASCE)HY.1943-7900.0000873

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