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Transport and deposition of fine sediment in open channels with different aspect ratios
Author(s) -
Bai Jing,
Fang Hongwei,
Stoesser Thorsten
Publication year - 2013
Publication title -
earth surface processes and landforms
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.294
H-Index - 127
eISSN - 1096-9837
pISSN - 0197-9337
DOI - 10.1002/esp.3304
Subject(s) - settling , deposition (geology) , turbulence , aspect ratio (aeronautics) , channel (broadcasting) , sediment , open channel flow , flow (mathematics) , sediment transport , geology , environmental science , hydrology (agriculture) , mechanics , geotechnical engineering , materials science , geomorphology , environmental engineering , physics , engineering , composite material , electrical engineering
This paper investigates by means of several large eddy simulations how the channel aspect ratio affects the transport and settling of suspended sediments. The numerical method is successfully validated using data of a physical experiment of fine sediment net deposition in an open channel flow. The channel aspect ratio, A , is known to be the determining factor for the development, strength and distribution of the turbulence‐driven secondary flow, and it is demonstrated that A influences the primary flow, turbulence quantities and the transport and fate of fine sediments. The secondary flow locally supports or hinders the falling of fine sediment particles in a turbulent flow, which results in a non‐uniform deposition of fine sediments over the cross‐section. While the channel aspect ratio has a large influence on the distribution of suspended sediments within the cross‐section, its effect on the cross‐sectional averaged deposition is negligibly small. Copyright © 2012 John Wiley & Sons, Ltd.