Associate Professor Chris Tindle

MSc, PhD (Brit Col), FNZIP, FASA

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Honorary Academic

Research | Current

Wavefront modelling

Wavefront modelling is a new method of calculating waveforms in underwater acoustics. It is based on ray tracing but uses a depth-time diagram which is found by tracing a fan of rays to the desired range and finding their depth and travel time. The depth-time diagram determines the arrival times and amplitudes of pulses at the receiver. The phase of the received pulses is found from the phase changes accumulating from reflection and refraction turning points. An integral for each ray arrival can be evaluated numerically or analytically with stationary phase methods and gives a full description of caustics, cusps and shadow zones even at low frequencies. The method is fast and able to handle very rapid range dependence such as occurs in shallow water with surface waves. The underside of a wave crest acts like a curved mirror and focusses sound to give large fluctuations in sound intensity as waves pass over.

Areas of expertise

  • Theoretical and experimental Underwater Acoustics
  • Underwater sound and marine fauna

 

Selected publications and creative works (Research Outputs)

  • Tindle, C. T., Jeffs, A. G., Ghazali, S., & Radford, C. A. (2012). Recorded noise as a source for measurement of propagation loss. Australian Acoustical Society Conference 2012, Acoustics 2012: Acoustics, Development, and the Environment.
    URL: http://hdl.handle.net/2292/30534
    Other University of Auckland co-authors: Craig Radford, Andrew Jeffs
  • Deane, G. B., Preisig, J. C., Tindle, C. T., Lavery, A., & Dale Stokes, M. (2012). Deterministic forward scatter from surface gravity waves. Journal of the Acoustical Society of America, 132 (6), 3673-3686. 10.1121/1.4763996
  • Radford, C. A., Tindle, C. T., Montgomery, J. C., & Jeffs, A. G. (2011). Modelling a reef as an extended sound source increases the predicted range at which reef noise may be heard by fish larvae. Marine Ecology Progress Series, 438, 167-174. 10.3354/meps09312
    URL: http://hdl.handle.net/2292/14185
    Other University of Auckland co-authors: Craig Radford, John Montgomery, Andrew Jeffs
  • Radford, C. A., Tindle, C. T., Montgomery, J. C., & Jeffs, A. G. (2009). The range at which pre-settlement fish can detect reef sound. Paper presented at New Zealand Marine Science Society and Meteorological Society of New Zealand Joint Conference, Auckland, New Zealand. 2 September - 4 September 2009.
    Other University of Auckland co-authors: Craig Radford, John Montgomery, Andrew Jeffs
  • Parsons, S., Radford, C., Jeffs, A., Baker, C. S., & Tindle, C. (2009). Quantification of ambient noise levels and acoustic characteristics of tourist vessels in Fiordland, New Zealand: Implications for cetaceans. Paper presented at International Conference on Bioacoustics, Loughborough, UK. 1 March - 5 March 2009.
    Other University of Auckland co-authors: Stuart Parsons, Craig Radford, Andrew Jeffs, Charles Baker
  • Radford, C. A., Jeffs, A. G., Tindle, C. T., & Montgomery, J. C. (2008). Temporal patterns in ambient noise of biological origin from a shallow water temperate reef. OECOLOGIA, 156 (4), 921-929. 10.1007/s00442-008-1041-y
    URL: http://hdl.handle.net/2292/14186
    Other University of Auckland co-authors: Craig Radford, Andrew Jeffs, John Montgomery
  • Radford, C. A., Jeffs, A. G., Tindle, C. T., & Montgomery, J. C. (13/8/2007). Ambient noise in shallow temperate waters around North-Eastern New Zealand. Poster presented at Effects of Noise on Aquatic Life. Nyborg, Denmark., Nyborg, Denmark.
    Other University of Auckland co-authors: Craig Radford, Andrew Jeffs, John Montgomery
  • Radford, C. A., Jeffs, A. G., Tindle, C. T., Cole, R. G., & Montgomery, J. C. (2005). Bubbled waters: The noise generated by underwater breathing apparatus. MARINE AND FRESHWATER BEHAVIOUR AND PHYSIOLOGY, 38 (4), 259-267. 10.1080/10236240500333908
    URL: http://hdl.handle.net/2292/21321
    Other University of Auckland co-authors: Craig Radford, Andrew Jeffs, John Montgomery

Contact details

Primary location

COMMERCE A - Bldg 114
Level 1 , Room 109
3A SYMONDS ST
AUCKLAND 1010
New Zealand