Development of a system to measure marine turbulence

 

Show simple item record

dc.contributor.advisor Jongens, A W D en_ZA
dc.contributor.author Main, Ian Cameron en_ZA
dc.date.accessioned 2014-09-05T12:35:58Z
dc.date.available 2014-09-05T12:35:58Z
dc.date.issued 1989 en_ZA
dc.identifier.citation Main, I. 1989. Development of a system to measure marine turbulence. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/6917
dc.description Bibliography: leaves 109-113. en_ZA
dc.description.abstract Various transducers have been developed turbulent shear in the ocean. The airfoil probe with it's piezoceramic beam encapsulated in a rubber airfoil has the simplest electronic processing system. However, the beam is very fragile and displays unpredictable thermal effects. An airfoil probe with semiconductor strain gauges on an aluminium cantilever beam has been developed as an alternative to the piezoceramic beam. The probe was calibrated by exciting it with a known shear generated by the water flow from an oscillating nozzle. During the calibration the thermal sensitivity of the probe was established to be -1.7 % °C-1• The probe, along with it's high gain, low noise processing system, is fitted to a tethered free-fall vehicle. A solid state data logger situated in the vehicle is used to record the data generated by the turbulence probe and a pressure transducer. Field trials at St.Helena Bay and Hout Bay showed that the sensitivity of the system is 20 dB lower than that of similar systems using piezoceramic beams. The system is able to resolve turbulent dissipation levels above 10-8 W kg-1, making it useful in regions characterised by a typical mixed layer (dissipation level of 10-W kg-1); however, it's sensitivity is not adequate for deep sea measurements where dissipation levels may be as low as 10-10 W kg-1. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Electrical and Electronic Engineering en_ZA
dc.title Development of a system to measure marine turbulence en_ZA
dc.type Thesis / Dissertation en_ZA
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Engineering & the Built Environment en_ZA
dc.publisher.department Department of Electrical Engineering en_ZA
dc.type.qualificationlevel Masters en_ZA
dc.type.qualificationname MSc en_ZA
uct.type.filetype Text
uct.type.filetype Image


Files in this item

This item appears in the following Collection(s)

Show simple item record