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research article

Kelvin waves in Lake Geneva

Bouffard, Damien  
•
Lemmin, Ulrich  
2013
Journal of Great Lakes Research

The passage of Kelvin waves in Lake Geneva after strong wind events was experimentally investigated in 1987 and 2002 using thermistor chains, current meters and Acoustic Doppler Current Profilers (ADCP) probing the whole water column, including the bottom boundary layer. Characteristics of these internal waves such as period, amplitude, exponential decay with distance from the shore and damping were determined. A significant increase of shear was observed in the thermocline region during the passage of a Kelvin wave crest. The passage of a Kelvin wave crest also led to a well-mixed bottom boundary layer characterized by a logarithmic velocity profile, complying with the so-called "law of the wall" up to an average height of 11 m. A bottom drag coefficient of 2.5 x 10(-3) was determined from our measurements. We estimated that similar to 70% of the Kelvin wave energy is dissipated in the bottom boundary layer. This study shows that the passage of Kelvin waves energizes the thermocline and near bed region and that this process is of fundamental importance in the dynamics of the nearshore region of mid-latitude large lakes. (C) 2013 International Association for Great Lakes Research. Published by Elsevier B.V. All rights reserved.

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Type
research article
DOI
10.1016/j.jglr.2013.09.005
Web of Science ID

WOS:000328314300014

Author(s)
Bouffard, Damien  
Lemmin, Ulrich  
Date Issued

2013

Publisher

Elsevier Sci Ltd

Published in
Journal of Great Lakes Research
Volume

39

Issue

4

Start page

637

End page

645

Subjects

Kelvin waves

•

Field observations

•

Shear

•

Bottom boundary layer

•

Energy dissipation

•

Lake Geneva

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
APHYS  
ECOL  
Available on Infoscience
January 9, 2014
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/99204
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