Experimental analysis of flow and turbulence in the wake of neighboring emergent vegetation patches with different densities

Kitsikoudis, Vasileios; Yagci, O.; Kirca, V. S. O.

doi:10.1007/s10652-020-09746-6

Article (Scientific journals)

Experimental analysis of flow and turbulence in the wake of neighboring emergent vegetation patches with different densities

Kitsikoudis, Vasileios; Yagci, O.; Kirca, V. S. O.

2020 • In Environmental Fluid Mechanics, 20 (6), p. 1417-1439

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https://hdl.handle.net/2268/262774

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10.1007/s10652-020-09746-6

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Keywords :

Emergent vegetation; Flow-vegetation interaction; Neighboring vegetation patches; Shear layers; Turbulence; Wakes

Abstract :

[en] Patches of vegetation in natural water bodies grow close to each other and may affect each other’s wake pattern with significant implications on nutrient uptake and local sediment transport. This experimental study analyzed the wakes of two neighboring circular patches of emergent artificial vegetation with different densities, with the tested solid volume fractions being equal to 0.059, 0.114, and 0.188. The neighboring patches were positioned in two different configurations, namely side-by-side (L/ D= 0 and T/ D= 1.5) and staggered (L/ D= 3.5 and T/ D= 1.5) configurations, with D, L, and T denoting the patch diameter, the patches center-to-center longitudinal distance, and the patches center-to-center transverse distance, respectively. Results show that neighboring patches with different densities generated two distinctly different wakes at the near downstream while after 7–10D these two wakes started merging into one. The flow immediately downstream of a patch was not significantly affected by the presence of a neighboring patch and remained similar to that of an isolated patch, besides the wake of the upstream patch in staggered configuration, which was significantly affected by the downstream patch. The solid volume fraction of the neighboring patch determined the flow velocity and turbulence intensity in between the patches, which were much different compared to measurements at the side of an isolated patch. © 2020, Springer Nature B.V.

Disciplines :

Civil engineering

Author, co-author :

Kitsikoudis, Vasileios ; Université de Liège - ULg

Yagci, O.; Division of Hydraulics, Civil Engineering Department, Istanbul Technical University, Maslak, Istanbul, 34467, Turkey

Kirca, V. S. O.; Division of Hydraulics, Civil Engineering Department, Istanbul Technical University, Maslak, Istanbul, 34467, Turkey

Language :

English

Title :

Experimental analysis of flow and turbulence in the wake of neighboring emergent vegetation patches with different densities

Publication date :

2020

Journal title :

Environmental Fluid Mechanics

ISSN :

1567-7419

eISSN :

1573-1510

Publisher :

Kluwer Academic Publishers, Netherlands

Volume :

Issue :

Pages :

1417-1439

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 26 August 2021

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