气候变化领域集成服务门户(CCPortal): A Two-Layer Turbulence-Based Model to Predict Suspended Sediment Concentration in Flows With Aquatic Vegetation

CCPortal

DOI	10.1029/2020GL091255
	A Two-Layer Turbulence-Based Model to Predict Suspended Sediment Concentration in Flows With Aquatic Vegetation
	Tseng C.-Y.; Tinoco R.O.
发表日期	2021
ISSN	0094-8276
卷号	48 期号:3
英文摘要	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. © 2020. The Authors.
英文关键词	Atmospheric thermodynamics; Boundary layers; Flow velocity; Forecasting; Kinetic energy; Kinetics; Open channel flow; Quality management; Sediment transport; Sedimentation; Shear flow; Shear stress; Turbulence; Vegetation; Water conservation; Water management; Water quality; Aquatic vegetation; Bed shear stresss; Bottom boundary layer; Coherent structure; Landscape evolutions; Parabolic profiles; Suspended sediment concentrations; Turbulent kinetic energy; Suspended sediments
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169147
作者单位	Department of Civil and Environmental Engineering, University of Illinois, Urbana, IL, United States
推荐引用方式 GB/T 7714	Tseng C.-Y.,Tinoco R.O.. A Two-Layer Turbulence-Based Model to Predict Suspended Sediment Concentration in Flows With Aquatic Vegetation[J],2021,48(3).
APA	Tseng C.-Y.,&Tinoco R.O..(2021).A Two-Layer Turbulence-Based Model to Predict Suspended Sediment Concentration in Flows With Aquatic Vegetation.Geophysical Research Letters,48(3).
MLA	Tseng C.-Y.,et al."A Two-Layer Turbulence-Based Model to Predict Suspended Sediment Concentration in Flows With Aquatic Vegetation".Geophysical Research Letters 48.3(2021).