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Title: Settling velocity and threshold characteristics of biogenic sediments
Author: Nash, L. A.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1988
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Studies on sediment transport rates are of great importance in fields such as offshore engineering and basic sedimentology. Within this context, this investigation is concerned with the initial motion of non-cohesive biogenic sediments under unidirectional flow conditions. Relevant publications on boundary layer flows and sediment transport are reviewed. The experiments were conducted in a recirculating laboratory flume fitted with a trolley onto which loose sediment grains were placed. Experiments were conducted using this and a laser-doppler anemometer (LDA), Streamflo current meter and a video camera. A semi-quantitative motion criterion was applied to the experiments in order to investigate the motion of two well-sorted biogenic sediments (Mytilus edulis and Cardium edule). The data were processed and analysed using digital and analogue techniques. The sediment samples were also examined in terms of grain size and settling characteristics. Detailed flow experiments were made of four unidirectional flows. Gaussian statistics were derived from these velocity-time series data sets which provided a comparison for the threshold data. Data were compared with theoretical and empirical relationships proposed by other investigators. A number of recommendations for future research have been put forward.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available