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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

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
Hydrographic Surveying Multibeam Echosounder

  • 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
Hydrographic Surveying - Purposes Multibeam Echosounder

  • Navigational aide

  • Quantity surveys

  • Inspections of dams, bridges, and water control structures

  • Habitat assessments

  • Hydrodynamic and sediment-transport models

  • Geomorphic assessments


Single beam echosounder
Single-Beam Echosounder Multibeam Echosounder


Multibeam hydrographic surveying
Multibeam Hydrographic Surveying Multibeam Echosounder

  • 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
Shallow Water Multibeam Multibeam EchosounderHydrographic 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
Multibeam Echosounder Multibeam Echosounder


Reson seabat 7125 multibeam echosounder system
RESON Seabat 7125 Multibeam EchosounderMultibeam 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
Multibeam Echosounder Components Multibeam Echosounder

Projector

Array

Sound

Velocity

Probe

Receiver

Array


Multibeam echosounder components1
Multibeam Echosounder Components Multibeam Echosounder

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


Patch test calibration
Patch Test Calibration Multibeam Echosounder

Roll correction

Pitch correction

Yaw correction

Nadar Beam



Bridge Piers near Warsaw, Missouri Multibeam Echosounder


Bridge Pier near Warsaw, Missouri Multibeam Echosounder


Multibeam data processing
Multibeam Data Processing Multibeam Echosounder

  • Dell Precision T7500

  • Intel Xeon Quad Core Processor 3.46 GHz

  • 12GB DDR3 SDRAM, 1333MHz,

  • 2 GeForce GTX 480 2.0

  • Graphics Card


Multibeam data processing1
Multibeam Data Processing Multibeam Echosounder

Line-by-line swath editing is necessary


Multibeam data processing2
Multibeam Data Processing Multibeam Echosounder


Gavins Point Dam Multibeam Survey Multibeam Echosounder

  • Purpose:

  • Document change from 1957-2008

  • Verify the integrity of energy dissipation structures

  • Create updated bathymetric contours


Gavins Point Dam Spillway Multibeam Echosounder


Energy Dissipation Structures Multibeam Echosounder

  • Determined the

  • structural integrity

  • Divers were not needed, eliminating a safety hazard

  • Measured change to 0.1 M


Gavins point dam spillway intake
Gavins Point Dam - Spillway Intake Multibeam Echosounder


Missouri river bends
Missouri River Bends Multibeam Echosounder

Missouri River Habitat Assessment and Monitoring Program (HAMP)

  • Habitat improvement through structure modification

  • Wing dike notches

  • Chevrons

  • Parallel dikes

  • Revetment removal


Hydrographic surveys of glovers bend
Hydrographic Surveys of Glovers Bend Multibeam Echosounder

Single-beam echosounder

Glovers Bend, Missouri River

2007


Hydrographic surveys of glovers bend1
Hydrographic Surveys of Glovers Bend Multibeam Echosounder

Multibeam echosounder

Glovers Bend, Missouri River

2009



Experimental advanced airborne research lidar eaarl
Experimental Advanced Airborne Research LiDAR (EAARL) Multibeam Echosounder

Water penetrating LiDAR

Uses Blue-green laser

NASA/USGS Technology

Shallow water EAARL survey, Central Platte River



CONTACT INFORMATION: Rick Wilson SubstrateUSGS Nebraska Water Science Center (402) 328-41205231 South 19th St. [email protected], NE 68512-1271 http://ne.water.usgs.gov

Robert B. Swanson

Director

(402) 328-4110

[email protected]

Richard C. Wilson, P.E.

Associate Director of

Hydrologic Studies

(402) 328-4120

[email protected]

Ronald B. Zelt

Associate Director of NAWQA Studies

(402) 328-4140

[email protected]

Jason M. Lambrecht

Associate Director of Hydrologic Data

(402) 328-4124

[email protected]


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