Abstract
A sediment transport study was conducted along the east shoreline of the Nisqually River Delta, Southern Puget Sound, Washington, to provide baseline data for an Environmental Impact Statement and preliminary design criteria for a forest products exporting wharf. The study was concerned with determining the characteristics of beach and deltaic sediments, the factors affecting sediment transport along the shoreline and on the delta, and the directions and rates of sediment transport. Sediment transport on the beach was determined by interpretation of beach profiles and sediment textural characteristics and by a beach grain tagging experiment. An estimate of sediment movement on the delta platform was obtained from sediment trap data and an historical chart comparison. The analysis suggested that waves were responsible for the small amount of sediment transported on the beach and that tidal currents were responsible for sediments transported over the Nisqually Delta platform. Sediment transport on the beach was relatively low and was in a northerly direction. Sediment transport rates on the delta platform were on the order of 4 t 10 m5 gm/cm-sec or less, with the transport in the direction of the tidal currents.
Published Version
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