Transverse distribution of the streamwise velocity for the open-channel flow with floating vegetated islands.
Comprehensive friction factor
Depth-averaged streamwise velocity
Drag force term
Floating vegetated island
Secondary flow
Velocity distribution
Journal
Environmental science and pollution research international
ISSN: 1614-7499
Titre abrégé: Environ Sci Pollut Res Int
Pays: Germany
ID NLM: 9441769
Informations de publication
Date de publication:
Oct 2021
Oct 2021
Historique:
received:
26
01
2021
accepted:
06
05
2021
pubmed:
14
5
2021
medline:
25
9
2021
entrez:
13
5
2021
Statut:
ppublish
Résumé
Floating vegetation islands (FVIs) have been widely utilized in various river ecological restoration projects due to their ability to purify pollutants. FVIs float at the surface of shallow pools with their roots unanchored in the sediment. Biofilm formed by roots under islands filters nutrients and particles in the water flowing through it. Flow field disturbance will occur, and transverse distribution of flow velocity will change due to the existence of FVIs. Transport efficiency of suspended solids, nutrients, and pollutants will also be altered. A modified analytical model that considers the effects of boundary friction, drag force of vegetation, transverse shear turbulence, and secondary flow is established to model the transverse distributions of depth-averaged streamwise velocity for the open-channel flow with FVIs using the Shiono and Knight Method. The simulation results with suitable boundary conditions successfully modeled the lateral profile of the depth-averaged streamwise velocity compared with the experimental results of symmetrical and unsymmetrical arrangements of FVIs. Hence, the presented model is of guiding significance to investigate the flow characteristics of rivers with FVIs.
Identifiants
pubmed: 33982251
doi: 10.1007/s11356-021-14353-z
pii: 10.1007/s11356-021-14353-z
doi:
Substances chimiques
Water
059QF0KO0R
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
51265-51277Subventions
Organisme : National Natural Science Foundation of China
ID : 52020105006
Organisme : National Natural Science Foundation of China
ID : 11872285
Informations de copyright
© 2021. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
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