Graduate Thesis Or Dissertation
 

Seasonal variations [in] tidal dynamics, water quality, and sediments in the Siletz Estuary

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  • The Siletz Estuary was studied in 1973 to determine seasonal variations in tidal dynamics, water quality, and sediments. Tidal ranges and times were measured and compared to predicted values at two positions within the bay. Tidal ranges and times were analyzed to determine the dampening and phasing conditions within the estuary during each seasonal period. Tidal dampening was found to be strongly related to riverflow which varies seasonally. Phasing relations did not appear to have a strong seasonal dependence. Tidal currents were measured and tidal flows were determined on a seasonal basis. Phase relations between maximum flood and ebb flows and maximum and minimum tidal heights were established. Ebbing phase conditions appeared to depend on riverflow, while flooding phase conditions did not. Water-quality samples were taken and analyzed for seasonal changes in temperature, salinity, dissolved oxygen, pH, and turbidity. A strong dependence on riverflow and tidal range was observed for variations in these parameters. The Siletz Estuary was classified seasonally using the salinity gradient method of Burt and McAlister and the flow ratio scheme of Simmons. Salinity intrusion was measured under low flow conditions. Flushing rates were determined using the fraction of freshwater method and the modified tidal prism method. Sediments were examined for grain size distribution, uniformity coefficient, volatile solids and porosity during winter and summer conditions.
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