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Shallow Water Multibeam Sonar Training and Operations:

The Royal Danish Administration of Navigation and Hydrography. Shallow Water Multibeam Sonar Training and Operations: The past decade, and future prospects 3 rd April 2005. Data capture fundamentals. What is needed? Position Depth Time. RDANH’s first shallow water multibeam system.

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Shallow Water Multibeam Sonar Training and Operations:

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  1. The Royal Danish Administration of Navigation and Hydrography Shallow Water Multibeam Sonar Training and Operations: The past decade, and future prospects 3rd April 2005

  2. Data capture fundamentals. • What is needed? • Position • Depth • Time

  3. RDANH’s first shallow water multibeam system

  4. The hydrographic survey launch Survey launch (O-Boat): Length 7.75 meters Width 2.5 meters Tonnage 3.5 t Equipment: GPS Ashtech Z-12 Motion sensor POS/MV Multibeam SeaBat 8101 Singlebeam None Sidescan imagery SeaBat 8101 Heading sensor POS/MV Sound velocity ASV5002 On-line SVL SVP-C

  5. Survey launch concept. CTD On-line SVL Helmsman GPS-receiver Multibeam Surveyor Motion-sensor Multibeam mounting

  6. The hydrographic survey boat Survey Boat (SKA-79 class): Length 20 meters Width 5.2 meters Tonnage 50 t Equipment: GPS Ashtech Z-12 Motion sensor POS/MV Multibeam BCC MK II – Denmark SeaBat8111ER – Greenland Singlebeam Navisound 420 Sidescan sonar EG&G DF-1000 Heading sensor POS/MV and Anshütz Standard-20 Sound velocity ASV5002 On-line SVL SVP-C

  7. The hydrographic survey ship • SF-300 class Gribben (GRIB) • Length 52 meters • Width 9 meters • Tonnage 300 t • Equipment: • GPS Ashtech Z-12 • Motion sensor DMS2-05 • Multibeam SeaBat8101-ER • Singlebeam Navisound 420 • Sidescan sonar EG&G DF-1000 • SideScan imagery SeaBat8101-ER • Heading sensor LSN INS system • Sound velocity ASV5002 • Sound velocity ScanFish MKII • On-line SVL SVP-C

  8. The new hydrographic survey boat • MSF class “NoName” • Length • Width • Tonnage • Equipment: • GPS • Motion sensor • Multibeam • Singlebeam • Sidescan sonar • Heading sensor • Sound velocity • Sound velocity • On-line SVL • 29 meters • 6.4 meters • ~ 100 t • Javad - Maxor • POS/MV • SeaBat7100 Dual 100/200 KHz • SeaBat7125 • Navisound 420 • EG&G DF-1000 • LSN INS system • ASV5002 • MVP • SVP-C Moon pool for SeaBat7100mounting Hull mounted SeaBat7125

  9. Mounting of Seabat7100/7125 SeaBat7100 mounting SeaBat7125 mounting

  10. The harmonized resurvey plan for routes in the Baltic area. As required by the HELCOM Copenhagen declaration

  11. Background • Baltic Sea countries have agreed on a joint hydrographic re-survey plan. • The plan is implemented from 2003. • The resurvey of the Danish routes and ports is expected finished in 2007.

  12. Vertical test !

  13. Target in the Sound GPS antenna Tower

  14. RTK test in the Sound 197 observations on target 6168341.134N 734279.705E 7.695 Correct XYZ (DNN)

  15. RTK test in the Sound

  16. RTK problems!

  17. In-house software • Vise – Line editor • Semi – building up DTM’s • SemAntics – analytic tool • Forward and backward method • Svelte – Analytic tool for sound speed validation • Test of automated line editing.

  18. Sound Speed - problem!

  19. Details from the Sound Barrier Mooring from bouy Tunnel Larger stones Dredging

  20. What do we do when echo sounding fails?

  21. Another multibeam survey in shallow water

  22. Multibeam limitations – and one solution Sidescan imagery from SeaBat 8101 Eel grass Bathymetry from SeaBat 8101

  23. RTK - Bar sweep

  24. RTK - Bar sweep

  25. Questions ? Royal Danish Administration of Navigation and Hydrography Overgaden O. Vandet 62B P.O. Box 1919 DK-1023 Copenhagen K www.frv.dk

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