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Implementation of Tilted Multibeam Transducer in Ultra-Shallow Riverine Environment

This study explores the use of a tilted multibeam transducer for surveys in ultra-shallow riverine environments. The findings demonstrate increased swath width and improved data collection further inshore. The paper also discusses total propagated uncertainty and the CUBE filtering regime.

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Implementation of Tilted Multibeam Transducer in Ultra-Shallow Riverine Environment

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  1. A study in the implementation of a tilted multibeam transducer in an ultra-shallow riverine environment Shallow Survey 2008, Portsmouth NH Michael O. Gonsalves, LTJG/NOAA Dean J. Battilana, LEUT/RAN University of Southern Mississippi – Summer Survey 2008

  2. o o o o o 0 0 o o O o o N O o

  3. Presentation Overview • Survey Background… • Tilted Mount – Increased swath width… • Tilted Mount – Data further inshore… • Total Propogated Uncertainty… • CUBE Filtering Regime… • Conclusions…

  4. Survey Area Pearl River, LA/MS University of Southern Miss. Port Bienville Industrial Complex Ultra Shallow…

  5. Available Platforms Open Skiff Draft – 0.30m Knudson SBES LeMoyne Draft – 1.0m Imagenex DeltaT

  6. An opportunity for improvement…

  7. Usable Swath Width vs. Depth

  8. Swath Width vs. Spot Spacing Anticipated Survey Conditions

  9. Percent Gains vs. Traditional Mount Can survey to 12m without loss

  10. Tilted mount facilitating inshore acquisition TD = 1.0m α= 5-deg DS = 11.4m

  11. Tilted mount facilitating inshore acquisition SB Draft – 0.3m MB Draft – 1.0m

  12. Tilted mount facilitating inshore acquisition (cultural features vs. sloping beach)

  13. An increased swath…

  14. Total Propogated Uncertainty *beep* *boop*

  15. Total Propogated Uncertainty

  16. Outerbeam Noise Noisy outerbeams resulting from a truncated receive time… …where outer-fluff is at a constant range…

  17. Total Propogated Uncertainty

  18. Build PFM from HDCS Processing Pipeline I CARIS HIPS FLEDERMAUS • Convert Data • Apply Tide & SV • Calculate TPU PFM Direct • Create CUBE surface

  19. Total Propogated Uncertainty & CUBE

  20. Build PFM from HDCS Processing Pipeline II CARIS HIPS FLEDERMAUS • Convert Data • Apply Tide & SV • Calculate TPU PFM Direct • Create CUBE surface • Edit Hypotheses • Filter Soundings

  21. Hypotheses Editing Paradigm

  22. Hypotheses Editing Paradigm

  23. Build PFM from HDCS Processing Pipeline III CARIS HIPS FLEDERMAUS • Convert Data • Apply Tide & SV • Calculate TPU PFM Direct • Create CUBE surface • Edit Hypotheses Apply edits to HDCS • Filter Soundings • Quality Control • Final Cleaning

  24. Final Cleaned Data & Surfaces…

  25. Final Cleaned Data & Surfaces…

  26. Crossline Check – IHO Order

  27. Conclusions • With proper planning a high-accuracy survey can be conducted with a tilted mount by quantifying: • Depth Ranges • Desired Resolution • Desired Distance from shore • Increased outerbeam noise can be handled with a proper filtering scheme Questions?

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