TY - GEN
T1 - Operational modal analysis of low frequency surface waves in Lakes and reservoirs
AU - Wynne, Zachariah
AU - Reynolds, Thomas
AU - Bouffard, Damien
AU - Schladow, Geoffrey
AU - Wain, Danielle
N1 - Acceptance date set to exclude from REF OA Policy
PY - 2019/5/15
Y1 - 2019/5/15
N2 - 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.
AB - 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.
KW - Low frequency oscillations
KW - Novel applications
KW - Random decrement technique
UR - http://www.scopus.com/inward/record.url?scp=85069509157&partnerID=8YFLogxK
UR - http://www.proceedings.com/49291.html
M3 - Conference contribution
AN - SCOPUS:85069509157
T3 - 8th IOMAC - International Operational Modal Analysis Conference, Proceedings
SP - 635
EP - 642
BT - 8th IOMAC - International Operational Modal Analysis Conference, Proceedings
A2 - Amador, Sandro D. R.
A2 - Brincker, Rune
A2 - Katsanos, Evangelos I.
A2 - Lopez Aenlle, Manuel
A2 - Fernandez, Pelayo
PB - International Operational Modal Analysis Conference (IOMAC)
T2 - 8th International Operational Modal Analysis Conference, IOMAC 2019
Y2 - 13 May 2019 through 15 May 2019
ER -