Evidence of High Vertical Wave-Number Behavior in a Continuously Stratified Reservoir: Boadella, Spain
Publication: Journal of Hydraulic Engineering
Volume 129, Issue 9
Abstract
High vertical wave-number modes clearly dominate the internal wave field during the stratification period in Boadella reservoir in northeast Spain. In this period, the extraction of hypolimnetic water, due to summer irrigation, brought the surface level down by 6 m in one month and the epilimnetic water progressively occupied the whole water column. The temperature profile, with the exception of a few meters at the surface layer, presented an almost constant temperature gradient of about 0.7°C/m. The period of the main vertical mode is 24 h with an amplitude of around 1 m. Thermistor chain records and meteorological data allow us to deduce that this mode is, at least, a third vertical mode forced by the wind, which normally has a typical periodicity of 24 h. However, when the wind changes direction from south to north, the circulation cells developed due to this forced nonstationary oscillation are destroyed. When this occurs, the Bulk Richardson number is Similar vertical structures as a response to wind forcing should be expected in similar systems, although this has not been reported in the literature.
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Published In
Journal of Hydraulic Engineering
Volume 129 • Issue 9 • September 2003
Pages: 734 - 737
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Mar 21, 2002
Accepted: Mar 28, 2003
Published online: Aug 15, 2003
Published in print: Sep 2003
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