Operational modal analysis of low frequency surface waves in Lakes and reservoirs

Zachariah Wynne, Thomas Reynolds, Damien Bouffard, Geoffrey Schladow, Danielle Wain

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Wind driven oscillations of water surfaces (surface seiches) are a key driver of ecological fluxes, such as of oxygen and nutrients, within lakes and reservoirs. These seiches exhibit low frequency oscillations with periods typically in the range from minutes to days, closely-spaced modes and a low signal to noise ratio, which makes modal analysis by simple spectral techniques challenging. Time domain operational modal analysis, specifically the Random Decrement Technique, was applied to extract modal parameters for the dominant surface seiches of Lake Geneva, Switzerland, and Lake Tahoe, USA. The results obtained show good agreement with existing literature on the periods and damping ratios of the seiches, historically obtained in this field by visual selection of free-decay sections of the time series or half-power peak picking. These analyses illustrate the potential for the use of techniques developed for operational modal analysis in areas outside the realm of mechanical and civil structures dynamics.

Original languageEnglish
Title of host publication8th IOMAC - International Operational Modal Analysis Conference, Proceedings
EditorsSandro D. R. Amador, Rune Brincker, Evangelos I. Katsanos, Manuel Lopez Aenlle, Pelayo Fernandez
PublisherInternational Operational Modal Analysis Conference (IOMAC)
Pages635-642
Number of pages8
ISBN (Electronic)9788409049004
Publication statusPublished - 15 May 2019
Event8th International Operational Modal Analysis Conference, IOMAC 2019 - Copengahen, Denmark
Duration: 13 May 201915 May 2019

Publication series

Name8th IOMAC - International Operational Modal Analysis Conference, Proceedings

Conference

Conference8th International Operational Modal Analysis Conference, IOMAC 2019
CountryDenmark
CityCopengahen
Period13/05/1915/05/19

Keywords

  • Low frequency oscillations
  • Novel applications
  • Random decrement technique

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