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Title: Underwater detection of mobile sand grains
Author: Tanner, D. R.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1978
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This project was instigated to fulfill a need for an instrument which would accurately and reliably measure the movement of suspended sand grains carried along in a water flow, so that it may be correlated with other fluid flow parameters (such as flow rate and depth) as an element in a large scale research programme. Previous work suggests that such an instrument may well be feasible, but not without detailed consideration of the operating environment and background noise level. A brief review of the mechanism of sand transport and a study of the background noise level in the sea largely determines the size, shape, and operating frequency of a suitable transducer. An extensive review of likely transduction techniques has lead to the development of a range of transducers based on bonded piezo-electric flexure elements. These transducers have been tested using practical laboratory techniques to evaluate parameters such as sensitivity and hydrodynamic effects. A system of processing electronics has also been developed to enable the transducers to be used as stand-alone instruments, or to be integrated into a larger experimental system using a PDP 8 computer as system control and data logger. Sea trials of this instrument have been carried out from N.E.R.C. research ships in depths of water up to 20 metres and currents up to 7 knots, using geotechnical rigs designed to hold this and various other oceanographic equipment.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available