Flow velocity mapping in a circular experimental wave/current basin with small scale underwater acoustic tomography method
dc.contributor.advisor
Ingram, David
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dc.contributor.advisor
Polydorides, Nicholas
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dc.contributor.author
Li, Guangming
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dc.contributor.sponsor
other
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dc.date.accessioned
2020-01-31T09:40:08Z
dc.date.available
2020-01-31T09:40:08Z
dc.date.issued
2020-01-29
dc.description.abstract
Several researches normally use the rectangle tank for ocean device testing in laboratory trails.
Rectangle experimental tanks, however, can only generate normalized flow in one or some
fixed directions with limited testing area. Meanwhile, the appearance of the flow will be in
large extent affected by boundary. This thesis study flow details in a 25m diameter circular
testing facility Flowave TT, which can generate combined wave and current in any relative
direction. The spatial of flow current velocity obtained by fixed point direct measurement is
insufficient if the quantity of test points is not enough. Acoustic tomography is used here for
flow internal structure visualizing in the experimental basin by transmitting sound wave with
acoustic transducer. Using acoustic tomography method, one could get real-time mapping of
parameter variation by installing detect devices outside or at the boundary of interested region
without interrupting original field.
Two sets of underwater acoustic tomography system that developed in cooperation with
Hiroshima University were used for sound wave emitting and acoustic signal receiving. Travel
time of acoustic signal in the interested region is analysed to reconstruct flow velocity by
solving inverse problems. Multi-path arrivals that propagated by different ray paths are
identified by ray tracing. Flow details in the circular basin is studied in a horizontal plane and
along a vertical slice using acoustic method. Besides acoustic tomography experiments in the
Flowave, a field work was conducted in the Bali Strait, Indonesia. This trail explores the remote
sensing of tide progress in the Bali strait with coastal acoustic tomography systems. This study
is for the first time to conduct multi-station acoustic tomography experiment for flow velocity
reconstructing with only two stations. This study demonstrates that small scale flow profiles in
the experimental tank can be reconstructed with acoustic tomography method. The real time
monitoring of small-scale flow details can be accomplished with multi-station network, which
is one of the further research topics for small scale underwater acoustic tomography research.
en
dc.identifier.uri
https://hdl.handle.net/1842/36713
dc.identifier.uri
http://dx.doi.org/10.7488/era/20
dc.language.iso
en
dc.publisher
The University of Edinburgh
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dc.subject
Flowave TT
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dc.subject
testing facilities
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dc.subject
acoustic tomography
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dc.subject
sound wave emitting
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dc.subject
acoustic signal receiving
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dc.subject
circular basin testing
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dc.subject
Bali Strait
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dc.subject
fieldwork
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dc.title
Flow velocity mapping in a circular experimental wave/current basin with small scale underwater acoustic tomography method
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dc.type
Thesis or Dissertation
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dc.type.qualificationlevel
Doctoral
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dc.type.qualificationname
PhD Doctor of Philosophy
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