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Wave Damping in Reed: Field Measurements and Mathematical Modeling

Borell Lövstedt, Charlotta LU and Larson, Magnus LU (2010) In Journal of Hydraulic Engineering 136(4). p.222-233
Abstract
Wave damping in vegetation in shallow lakes reduces resuspension and thereby improves the light climate and decreases nutrient recycling. In this study, wave transformation in reed (Phragmites australis) was measured in a shallow lake. Theoretical models of wave height decay, based on linear wave theory, and transformation of the probability density function (PDF), using a wave-by-wave approach, were developed and compared to the collected data. Field data showed an average decrease in wave height of 4–5% m/sup -1sup/ within the first 5–14 m of the vegetation. Incident root-mean-square wave height was 1–8 cm. A species-specific drag coefficient CD was found to be about 9 (most probable range: 3–25). CD showed little correlation with a... (More)
Wave damping in vegetation in shallow lakes reduces resuspension and thereby improves the light climate and decreases nutrient recycling. In this study, wave transformation in reed (Phragmites australis) was measured in a shallow lake. Theoretical models of wave height decay, based on linear wave theory, and transformation of the probability density function (PDF), using a wave-by-wave approach, were developed and compared to the collected data. Field data showed an average decrease in wave height of 4–5% m/sup -1sup/ within the first 5–14 m of the vegetation. Incident root-mean-square wave height was 1–8 cm. A species-specific drag coefficient CD was found to be about 9 (most probable range: 3–25). CD showed little correlation with a Reynolds number or a Keulegan-Carpenter number. The PDF for the wave heights did not change significantly, but for longer distances into the vegetation and higher waves it tended to be more similar to the developed transformed distribution than to a Rayleigh distribution. Relationships developed in this study can be employed for management purposes to reduce resuspension and erosion. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Environmental engineering, Lakes, Erosion, Wave spectra, Vegetation, Wave attenuation
in
Journal of Hydraulic Engineering
volume
136
issue
4
pages
222 - 233
publisher
American Society of Civil Engineers (ASCE)
external identifiers
  • wos:000275865600004
  • scopus:77953342993
ISSN
1943-7900
DOI
10.1061/(ASCE)HY.1943-7900.0000167
project
MERGE
language
English
LU publication?
yes
id
ee9d14da-0539-4b2c-8e64-3452f267f451 (old id 1045533)
date added to LUP
2008-03-10 15:48:27
date last changed
2018-05-29 12:13:54
@article{ee9d14da-0539-4b2c-8e64-3452f267f451,
  abstract     = {Wave damping in vegetation in shallow lakes reduces resuspension and thereby improves the light climate and decreases nutrient recycling. In this study, wave transformation in reed (Phragmites australis) was measured in a shallow lake. Theoretical models of wave height decay, based on linear wave theory, and transformation of the probability density function (PDF), using a wave-by-wave approach, were developed and compared to the collected data. Field data showed an average decrease in wave height of 4–5% m/sup -1sup/ within the first 5–14 m of the vegetation. Incident root-mean-square wave height was 1–8 cm. A species-specific drag coefficient CD was found to be about 9 (most probable range: 3–25). CD showed little correlation with a Reynolds number or a Keulegan-Carpenter number. The PDF for the wave heights did not change significantly, but for longer distances into the vegetation and higher waves it tended to be more similar to the developed transformed distribution than to a Rayleigh distribution. Relationships developed in this study can be employed for management purposes to reduce resuspension and erosion.},
  author       = {Borell Lövstedt, Charlotta and Larson, Magnus},
  issn         = {1943-7900},
  keyword      = {Environmental engineering,Lakes,Erosion,Wave spectra,Vegetation,Wave attenuation},
  language     = {eng},
  number       = {4},
  pages        = {222--233},
  publisher    = {American Society of Civil Engineers (ASCE)},
  series       = {Journal of Hydraulic Engineering},
  title        = {Wave Damping in Reed: Field Measurements and Mathematical Modeling},
  url          = {http://dx.doi.org/10.1061/(ASCE)HY.1943-7900.0000167},
  volume       = {136},
  year         = {2010},
}