TY - JOUR
T1 - A Two-Layer Turbulence-Based Model to Predict Suspended Sediment Concentration in Flows With Aquatic Vegetation
AU - Tseng, Chien Yung
AU - Tinoco, Rafael O.
N1 - Funding Information:
C.‐Y. Tseng acknowledges funding support from Taiwan‐UIUC Fellowship. This study was supported by NSF through CAREER EAR 1753200. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect those of the National Science Foundation. The authors are grateful to the editor and two anonymous reviewers for their thoughtful and constructive comments on improving and clarifying the article.
Publisher Copyright:
© 2020. The Authors.
PY - 2021/2/16
Y1 - 2021/2/16
N2 - 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.
AB - 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.
KW - coherent structure
KW - sediment transport
KW - suspended sediment concentration
KW - turbulence
KW - vegetated flows
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U2 - 10.1029/2020GL091255
DO - 10.1029/2020GL091255
M3 - Letter
AN - SCOPUS:85100979320
SN - 0094-8276
VL - 48
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 3
M1 - e2020GL091255
ER -