A Two-Layer Turbulence-Based Model to Predict Suspended Sediment Concentration in Flows With Aquatic Vegetation

Chien Yung Tseng, Rafael O. Tinoco

Research output: Contribution to journalLetterpeer-review

Abstract

Traditional bed shear stress-based models (e.g., Rouse model) derived from the classic parabolic profile of eddy viscosity in open-channel flows fail to accurately predict suspended sediment concentration (SSC) in flows with aquatic vegetation. We developed a two-layer, turbulence-based model to predict SSC profiles in emergent vegetated flows. Turbulence generated from vegetation, bed, and coherent structures caused by stem-bed-flow interaction are considered into the near-bed turbulent kinetic energy (TKE) to calculate the effective bed shear velocity, (Formula presented.). The model, validated by experimental data, further showed that the thickness height of the near-bed layer (effective bottom boundary layer), Hb, varies with flow velocity and canopy density. Two additional models are provided to estimate Hb and (Formula presented.). The model is expected to provide critical information to future studies on sediment transport, landscape evolution, and water quality management in vegetated streams, wetlands, and estuaries.

Original languageEnglish (US)
Article numbere2020GL091255
JournalGeophysical Research Letters
Volume48
Issue number3
DOIs
StatePublished - Feb 16 2021

Keywords

  • coherent structure
  • sediment transport
  • suspended sediment concentration
  • turbulence
  • vegetated flows

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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