The limited growth of vegetated shear layers
Name
WRR-The Limited Growth.pdf
Size
416.39 KB
Format
Adobe PDF
Checksum (MD5)
90a9971444a4b36af19680d1dba65b55
Author(s)
Ghisalberti, Marco
Nepf, Heidi
Date Issued
July 2004
Journal
Water Resources Research
Publisher
American Geophysical Union
Citation
Ghisalberti, M. “The limited growth of vegetated shear layers.” Water Resources Research 40.7 (2004). ©2004 American Geophysical Union.
Version
Final published version
Abstract
In contrast to free shear layers, which grow continuously downstream, shear layers generated by submerged vegetation grow only to a finite thickness. Because these shear layers are characterized by coherent vortex structures and rapid vertical mixing, their thickness controls exchange between the vegetation and the overlying water. Experiments conducted in a laboratory flume show that the growth of these obstructed shear layers is arrested once the production of shear-layer-scale turbulent kinetic energy (SKE) is balanced by dissipation of SKE within the canopy. This equilibrium condition, along with a mixing length closure scheme, was used in a one-dimensional numerical model to predict the mean velocity profiles of the experimental shear layers. The agreement between model and experiment is very good, but field application of the model is limited by a lack of description of the drag coefficient in a submerged canopy.
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/10.1029/2003WR002776
