Forced Resonant Oscillations as a Response to Periodic Winds in a Stratified Reservoir
Publication: Journal of Hydraulic Engineering
Volume 134, Issue 4
Abstract
The response of the Sau reservoir to a wind field characterized by having marked periodicities of and has been studied. Measurements of temperature, with a thermistor string, and currents, with an acoustic Doppler current meter, show that the reservoir also responds with the same water periodicities. During certain times of the stratified period, some of the natural oscillation modes of the reservoir are close to these forcing wind periods. In particular, in mid-July the vertical Mode V2 is close to and in mid- to end of September the vertical Mode V3 is close to . In these situations, these modes are selected out of the spectrum of possible internal waves and the reservoir behaves as a forced oscillator in resonance with the wind. The structure and the period of these vertical modes have been elucidated by using the 3D model ELCOM. Both modes are affected by the Earth’s rotation at the widest part of the reservoir.
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Acknowledgments
This work was supported by the Spanish government (MEC) through the UNSPECIFIEDCGL2004-02027/HID project. The writers thank the Catalan Water Agency and Aigües Ter-Llobregat for their support throughout the field campaigns. The writers thank the Center for Water Research (CWR-UWA), and its director Jörg Imberger for providing the writer with the model ELCOM, and also to Sebastian Morillo and Andres Gomez-Giraldo for their help in the use of it. The writers also thank Joan Armengol for his encouragement in the study of the Sau reservoir.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 134 • Issue 4 • April 2008
Pages: 416 - 425
Copyright
© 2008 ASCE.
History
Received: May 19, 2006
Accepted: Aug 8, 2007
Published online: Apr 1, 2008
Published in print: Apr 2008
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