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Shallow Water Hydrographic Surveying using a High Resolution Multibeam Echosounder

Shallow Water Hydrographic Surveying using a High Resolution Multibeam Echosounder. Richard C. Wilson, P.E., and Brenda K. Woodward Nebraska Water Science Center 2010 Tri-Agency Meeting Oct. 5, 2010. Hydrographic Surveying. Aristotle observed that sound could be heard in water

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Shallow Water Hydrographic Surveying using a High Resolution Multibeam Echosounder

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  1. Shallow Water Hydrographic Surveying using a High Resolution Multibeam Echosounder Richard C. Wilson, P.E., and Brenda K. Woodward Nebraska Water Science Center 2010 Tri-Agency Meeting Oct. 5, 2010

  2. Hydrographic Surveying • Aristotle observed that sound could be heard in water • Allies invent the sonar during World War I • Coast and Geodetic Survey deployed the Fathometer in 1925 • U.S. Navy deployed a multibeam echosounder in the 1960s

  3. Hydrographic Surveying - Purposes • Navigational aide • Quantity surveys • Inspections of dams, bridges, and water control structures • Habitat assessments • Hydrodynamic and sediment-transport models • Geomorphic assessments

  4. Single-Beam Echosounder

  5. Multibeam Hydrographic Surveying • Wide yet narrow swath perpendicular to the boat direction • Multiple beams in just one ping • SURVEYS the ENTIRE RIVER or LAKE BED

  6. Shallow Water Multibeam Hydrographic Surveying • Minimum depth is 1 meter • Swath angle 128° or width-to-depth ratio 3.5 to 1 • Rotation of the transducer for surveying horizontal features • Use Single and Multibeam Echosounders, together • Flat keel boat • Obstructions

  7. Multibeam Echosounder

  8. RESON Seabat 7125 Multibeam Echosounder System • Digital beam-former • 400 kHz • 256 or 512 beams • 128° swath angle • 200 meter range • Bathymetry data and Side-Scan imagery

  9. Multibeam Echosounder Components Projector Array Sound Velocity Probe Receiver Array

  10. Multibeam Echosounder Components Real-Time Kinematic Global Positioning System (RTKGPS) or Differential Global Positioning System (DGPS) Inertial Measurement Unit (IMU) Sonar display Navigation computer Position and Orientation Solution (POS-MV) motion control unit 7-P sonar signal processor

  11. Patch Test Calibration Roll correction Pitch correction Yaw correction Nadar Beam

  12. Collapsed Historical Bridge Deck near Warsaw, Missouri

  13. Bridge Piers near Warsaw, Missouri

  14. Bridge Pier near Warsaw, Missouri

  15. Multibeam Data Processing • Dell Precision T7500 • Intel Xeon Quad Core Processor 3.46 GHz • 12GB DDR3 SDRAM, 1333MHz, • 2 GeForce GTX 480 2.0 • Graphics Card

  16. Multibeam Data Processing Line-by-line swath editing is necessary

  17. Multibeam Data Processing

  18. Gavins Point Dam Multibeam Survey • Purpose: • Document change from 1957-2008 • Verify the integrity of energy dissipation structures • Create updated bathymetric contours

  19. Gavins Point Dam Spillway

  20. Energy Dissipation Structures • Determined the • structural integrity • Divers were not needed, eliminating a safety hazard • Measured change to 0.1 M

  21. Gavins Point Dam - Spillway Intake

  22. Missouri River Bends Missouri River Habitat Assessment and Monitoring Program (HAMP) • Habitat improvement through structure modification • Wing dike notches • Chevrons • Parallel dikes • Revetment removal

  23. Hydrographic Surveys of Glovers Bend Single-beam echosounder Glovers Bend, Missouri River 2007

  24. Hydrographic Surveys of Glovers Bend Multibeam echosounder Glovers Bend, Missouri River 2009

  25. Hydrodynamic Modeling of the Missouri River using MD_SWMS

  26. Experimental Advanced Airborne Research LiDAR (EAARL) Water penetrating LiDAR Uses Blue-green laser NASA/USGS Technology Shallow water EAARL survey, Central Platte River

  27. Side-Scan Sonar: Using Backscatter Intensity to Classify Substrate

  28. CONTACT INFORMATION: Rick Wilson USGS Nebraska Water Science Center (402) 328-41205231 South 19th St. wilson@usgs.govLincoln, NE 68512-1271 http://ne.water.usgs.gov Robert B. Swanson Director (402) 328-4110 rswanson@usgs.gov Richard C. Wilson, P.E. Associate Director of Hydrologic Studies (402) 328-4120 wilson@usgs.gov Ronald B. Zelt Associate Director of NAWQA Studies (402) 328-4140 rbzelt@usgs.gov Jason M. Lambrecht Associate Director of Hydrologic Data (402) 328-4124 jmlambre@usgs.gov

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