Drag, turbulence, and diffusion in flow through emergent vegetation
Name
Nepf-1999-Drag, trubulence.pdf
Size
1.05 MB
Format
Adobe PDF
Checksum (MD5)
0f9380a7013c4d2876ec3f657f894848
Author(s)
Nepf, Heidi
Date Issued
February 1999
Journal
Water Resources Research
Publisher
American Geophysical Union
Citation
Nepf, H. M. “Drag, turbulence, and diffusion in flow through emergent vegetation.” Water Resources Research 35.2 (1999): 479. © 1999 American Geophysical Union
Version
Final published version
Abstract
Aquatic plants convert mean kinetic energy into turbulent kinetic energy at the scale of the plant stems and branches. This energy transfer, linked to wake generation, affects vegetative drag and turbulence intensity. Drawing on this physical link, a model is developed to describe the drag, turbulence and diffusion for flow through emergent vegetation which for the first time captures the relevant underlying physics, and covers the natural range of vegetation density and stem Reynolds' numbers. The model is supported by laboratory and field observations. In addition, this work extends the cylinder-based model for vegetative resistance by including the dependence of the drag coefficient, CD, on the stem population density, and introduces the importance of mechanical diffusion in vegetated flows.
MIT Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1029/1998WR900069
