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- W2116130447 abstract "Measurements with Acoustic Doppler Current Profilers (ADCPs) and a thermistor string were used to investigate the seasonal variation of internal seiches in a 5-km-long temperate lake and the dissipation induced by the seiches in the bottom boundary layer. Velocity data, from a bottom-mounted 1.2-MHz ADCP were analyzed by cross-spectral analysis to determine the seiche modes. The first vertical mode was generally dominant but the second mode made a significant contribution at times and was present throughout the summer season. The modal periods, which were consistent with normal mode analysis, exhibited a marked seasonal change that correlated closely with the evolution of stratification. Measurements in the bottom boundary layer, by another ADCP, in pulse-pulse coherent-mode sampling at 4 Hz, allowed determination of the rate of turbulent kinetic energy dissipation via the Structure Function Method. Episodes of energy dissipation ~ 10-7 W kg-1 occurred during peak flow (~ 0.05 m s-1) in the seiche motion (period ~ 10 h) and coincided with times of significant Reynolds stress. Between these episodes, dissipation fell below the noise level (~ 5 × 10-9 W kg-1). The ratio of internal wave energy to the boundary-layer dissipation rate implies a decay time of ~ 75 h, which is similar to that for energy decay in strong seiches, indicating that boundary-layer dissipation makes a substantial contribution to energy loss from seiche motions. A major mixing event in August caused by near-resonant wind forcing brought metalimnion water to the surface and induced substantial mixing." @default.
- W2116130447 created "2016-06-24" @default.
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- W2116130447 date "2011-09-01" @default.
- W2116130447 modified "2023-09-27" @default.
- W2116130447 title "Internal seiche modes and bottom boundary-layer dissipation in a temperate lake from acoustic measurements" @default.
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- W2116130447 doi "https://doi.org/10.4319/lo.2011.56.5.1893" @default.
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