Author(s): K. Homorodi; T. Kramer; J. Jozsa
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Keywords: No Keywords
Abstract: Wind-induced waves in two shallow water bodies, Lake Neusiedl at the Austro-Hungarian border and the Stagnone di Marsala lagoon in Sicily have been measured and analysed by using standard wave pressure gauge, Nortek Vectrino and Vector ADVs supplied also with a pressure sensor. A spectral analysis with pressure compensation has been introduced to capture the surface wave components also in the high frequency range, significantly attenuated at the sensor depth. The spectral tail was treated as non-wave specific noise and replaced by extrapolating the mid-frequency range of the spectrum according to a fitted analytical power function based on the Pierson-Moskowitz or the JONSWAP spectrum, with an exponent close to–5, making the wave height and period estimation somewhat more precise. Velocity vector time series were also used to obtain surface waves. In an additional field campaign 3D velocities in developed wavy conditions were measured for a longer period in Lake Neusiedl by using 2 Nortek Vectrino operated in synchronised mode at different depths in a vertical. The collected time series could serve to confirm the above mentioned surface wave reconstruction methods, furthermore, to see the variation of the wave motion parameters along the depth. By velocity decomposition one could also analyse the depth-related differences in the turbulence accompanying the wave motion. The methodology and results of such an analysis are reported in the present paper.
Year: 2010