Chapter
Dec 31, 2015
Shingle Tracing by a New Technique
Authors: Peter Wright, J. S. Cross, and N. B. WebberAuthor Affiliations
Publication: Coastal Engineering 1978
Abstract
A major drawback of all existing tracer techniques for monitoring shingle movement, except that of labelling with radioactive isotopes, is that tracer recovery rates are invariably low, (commonly less than 15% of the total injected) because recovery is limited to the beach surface. Investigations were made into the possibilities of developing a new tracer that might overcome this problem.
The paper describes the results of, and the conclusions drawn from two trial field experiments carried out using metal tracer pebbles. These had specific gravities, size and shape similar to the indigenous beach pebbles, and were recovered both on and beneath the beach surface using metal detectors. By assessing the relative merits and drawbacks of the technique it was concluded that the use of metal pebbles as tracers for shingle beaches is more practical than other methods for most tracing purposes. At present the technique is best suited to investigations ranging in length from a few days to a few months and requiring small to medium-scale injections of 5000 tracer pebbles or less. The considerable scope for the further development and application of the technique is discussed.
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Published In
Coastal Engineering 1978
Pages: 1705 - 1714
Copyright
© 1978 American Society of Civil Engineers.
History
Published online: Dec 31, 2015
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Authors
Affiliations
Peter Wright
Department of Civil Engineering University of Southampton, England
J. S. Cross
Department of Civil Engineering University of Southampton, England
N. B. Webber
Department of Civil Engineering University of Southampton, England
Notes
1
used here in the context defined by Carr (1971), that is as encompassing all sediment particles whose long diameter, ‘a’, lies within the range 4-256mm, and as such includes the pebble and cobble categories of the Wentworth Scale.
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