Seasonal variations in tidal dynamics, water quality and sediments in the Siuslaw Estuary Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/1j92g9670

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  • Seasonal data on tides, water quality and sediments in the Siuslaw Estuary were collected. Tide and velocity data were analyzed to evaluate damping conditions in the estuary. The system was found to approximate a weakly damped standing wave. A strong relationship of damping conditions to river flow was observed. The equation of wave celerity was used to calculate the effective depth of the estuary. Physical water quality data were examined for dependence on tidal conditions and river flow. The relationship of freshwater flow ratio to estuary stratification was evaluated. The mixing conditions in the estuary were found to vary widely with streamflow. Salinity data were used to estimate estuary flushing times. Sediment sample data were examined for the relationship of physical parameters to distance from the estuary inlet and for seasonal changes. Grain size and other parameters were found to be relatively constant in the main channel of the estuary within about eight miles of the inlet. Shoaling conditions in the estuary were evaluated.
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