U.S. Department of the Interior U.S. Geological Survey 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
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U.S. Department of the Interior U.S. Geological Survey Shallow Water Hydrographic Surveying using a High Resolution Multibeam Echosounder Richard C. Wilson,
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U.S. Department of the InteriorU.S. Geological Survey
Shallow Water Hydrographic Surveying using a High Resolution Multibeam Echosounder
Richard C. Wilson, P.E., andBrenda K. WoodwardNebraska Water Science Center
2010 Tri-Agency MeetingOct. 5, 2010
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
Hydrographic Surveying - Purposes
• Navigational aide• Quantity surveys• Inspections of dams, bridges, and water control structures• Habitat assessments• Hydrodynamic and sediment-transport models• Geomorphic assessments
Single-Beam Echosounder
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
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
Multibeam Echosounder
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
Multibeam Echosounder Components
ProjectorArray
ReceiverArray
SoundVelocityProbe
Multibeam Echosounder Components Real-Time Kinematic Global Positioning System (RTKGPS) or Differential Global Positioning System (DGPS)
InertialMeasurementUnit (IMU) Navigation computer
Position and OrientationSolution (POS-MV) motion control unit
7-P sonar signal processor
Sonar display
Patch Test CalibrationRoll correction
Pitch correction
Yaw correction
Nadar Beam
Collapsed Historical Bridge Deck near Warsaw, Missouri
Richard C. Wilson, P.E.Associate Director of Hydrologic Studies (402) [email protected]
Ronald B. ZeltAssociate Director of NAWQA Studies(402) [email protected]
Jason M. LambrechtAssociate Director of Hydrologic Data(402) [email protected]
CONTACT INFORMATION: Rick Wilson USGS Nebraska Water Science Center (402) 328-41205231 South 19th St. [email protected], NE 68512-1271 http://ne.water.usgs.gov