THE MEASUREMENT OF OFFSHORE SHINGLE MOVEMENT

M.J. Crickmore, C.B. Waters, W.A. Price

Abstract


The objective was to obtain quantitative data on the movement of shingle under wave action in water depths of about 10 to 20 m by tracking pebbles tagged with radioactive material. The paper describes the method of tagging, the method of position fixing, and the development of an underwater detection vehicle with a wide field of view. The field tracer tests demonstrated both increased mobility with decreasing depth and the existence of a small landward movement of shingle inshore of a depth of 12 m. Existing predictive data on the threshold of movement under waves, based on the results of previous work in the laboratory, was confirmed.

Keywords


offshore shingle; movement measurement; shingle

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