Coherent structures in wind shear induced wave–turbulence–vegetation interaction in water bodies
Abstract
Flume experiments with particle imaging velocimetry (PIV) were conducted recently to study a complex flow problem where wind shear acts on the surface of a static water body in presence of flexible emergent vegetation and induces a rich dynamics of wave–turbulence–vegetation interaction inside the water body without any gravitational gradient. The experiments were aimed at mimicking realistic vegetated wetlands and the present work is targeted to improve the understanding of the coherent structures associated with this interaction by employing a combination of techniques such as quadrant analysis, proper orthogonal decomposition (POD), Shannon entropy and mutual information content (MIC). The turbulent transfer of momentum is found to be dominated by organized motions such as sweeps and ejections, while the wave component of vertical momentum transport does not show any such preference. Furthermore, by reducing the data using POD we see that wave energy for large flow depths and turbulent energy for all water depths is concentrated among the top few modes, which can allow development of simple reduced order models. Vegetation flexibility is found to induce several roll type structures, however if the vegetation density is increased, drag effects dominate over flexibility and organize the flow. The interaction between waves andmore »
- Authors:
-
[1];
- Karlsruhe Inst. of Technology (KIT) (Germany). Inst. of Meteorology and Climate Research (IMK-IFU)
- Freie Univ., Berlin (Germany). Dept. of Mathematics and Computer Sciences
- Univ. of Iowa, Iowa City, IA (United States). Dept. of Civil and Environmental Engineering
- Univ. of Houston, TX (United States). Dept. of Mechanical Engineering
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1394989
- Report Number(s):
- LA-UR-17-27299
Journal ID: ISSN 0168-1923
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Agricultural and Forest Meteorology
- Additional Journal Information:
- Journal Volume: 255; Journal ID: ISSN 0168-1923
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 60 APPLIED LIFE SCIENCES; 54 ENVIRONMENTAL SCIENCES; Earth Sciences; Coherent structures; Flexible emergent vegetation; PIV; POD; Quadrant analysis; Shannon entropy; Wave–turbulence interaction; Wind induced flow
Citation Formats
Banerjee, Tirtha, Vercauteren, Nikki, Muste, Marian, and Yang, Di. Coherent structures in wind shear induced wave–turbulence–vegetation interaction in water bodies. United States: N. p., 2017.
Web. doi:10.1016/j.agrformet.2017.08.014.
Banerjee, Tirtha, Vercauteren, Nikki, Muste, Marian, & Yang, Di. Coherent structures in wind shear induced wave–turbulence–vegetation interaction in water bodies. United States. https://doi.org/10.1016/j.agrformet.2017.08.014
Banerjee, Tirtha, Vercauteren, Nikki, Muste, Marian, and Yang, Di. Sat .
"Coherent structures in wind shear induced wave–turbulence–vegetation interaction in water bodies". United States. https://doi.org/10.1016/j.agrformet.2017.08.014. https://www.osti.gov/servlets/purl/1394989.
@article{osti_1394989,
title = {Coherent structures in wind shear induced wave–turbulence–vegetation interaction in water bodies},
author = {Banerjee, Tirtha and Vercauteren, Nikki and Muste, Marian and Yang, Di},
abstractNote = {Flume experiments with particle imaging velocimetry (PIV) were conducted recently to study a complex flow problem where wind shear acts on the surface of a static water body in presence of flexible emergent vegetation and induces a rich dynamics of wave–turbulence–vegetation interaction inside the water body without any gravitational gradient. The experiments were aimed at mimicking realistic vegetated wetlands and the present work is targeted to improve the understanding of the coherent structures associated with this interaction by employing a combination of techniques such as quadrant analysis, proper orthogonal decomposition (POD), Shannon entropy and mutual information content (MIC). The turbulent transfer of momentum is found to be dominated by organized motions such as sweeps and ejections, while the wave component of vertical momentum transport does not show any such preference. Furthermore, by reducing the data using POD we see that wave energy for large flow depths and turbulent energy for all water depths is concentrated among the top few modes, which can allow development of simple reduced order models. Vegetation flexibility is found to induce several roll type structures, however if the vegetation density is increased, drag effects dominate over flexibility and organize the flow. The interaction between waves and turbulence is also found to be highest among flexible sparse vegetation. But, rapidly evolving parts of the flow such as the air–water interface reduces wave–turbulence interaction.},
doi = {10.1016/j.agrformet.2017.08.014},
journal = {Agricultural and Forest Meteorology},
number = ,
volume = 255,
place = {United States},
year = {Sat Aug 26 00:00:00 EDT 2017},
month = {Sat Aug 26 00:00:00 EDT 2017}
}
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