Sand waves in a pristine estuary Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6w924f01v

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  • The stochastic and the Fourier theories for sand waves developed by Lee(11) and Hino(6), respectively, for unidirectional flows are extended in order to estimate the rate of sediment turnover (RST) under oscillatory flows in the South Slough estuary, Coos Bay, Oregon. Data were collected by a mechanical and a sonic profiler. Histograms are given for the distributions of the elevations of deposition and erosion for sand wave data measured by the mechanical profiler. It may be observed from these distributions that the Gaussian assumption required for the application of the stochastic theory is not satisfied. The parameters for the step length distribution are estimated for only one elevation of deposition and erosion and the theoretical Gamma distribution is computed. Wave number amplitude spectra are estimated from the sonic profiler sand wave data. The maximum amplitude in the sand waves which were measured in the South Slough estuary lie in the fundamental harmonic component; while for the Coos Bay main channel, the spectral amplitudes for the sand waves are dispersed over a wider band of wave numbers. Due to the weak hydrodynamic influence, the sand waves in the South Slough estuary are still in the initial stage of their growth and it may not be possible to estimate RST in the South Slough estuary by the stochastic method outlined by Lee(11). Due to the strong tidal influence and/or ship disturbances, the sand wave spectral amplitudes are well dispersed for the Coos Bay main channel data and it is possible to estimate the RST in the main channel from a wave number spectrum using a transformation between wave numbers and wave frequencies.
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