2/6/17

1

• Associates Degree in Natural Recourses Applied Sciences at Fox Valley Technical College

• Survey Intern for Brennan the Summer of 2009 •  Collected 484 Miles of Survey Data at 5 MPH

• Began Full Time with Brennan Spring of 2010 • Worked on Environmental Remediation Projects in Wisconsin,

Illinois, Michigan, Indiana, and Ohio • Became a Lead Hydrographer in 2013

• Transducer Function and Basic Underwater Acoustics • DGPS Equipment • RTK Equipment • Hydrographic Software • Hypack Shell • DGPS Vessel Setup & Data Collection • RTK Vessel Setup & Data Collection • Brennan QA Procedures

2/6/17

2

Projector: Sending the Acoustic Wave “Talking” Hydrophone: Receiving the Acoustic Wave “Listening” Reciprocal Transducers do Both

•  200/28 KHZ Dual Frequency Transducer •  Frequency: The Amount of Wavelengths in a Second •  200 KHZ = 200,000 Waves Per Second •  Each individual Wavelength is Either Shorter or Longer Depending on

Frequency. •  Each Individual Wavelength is Also Dependent on the Speed of Sound in the

Water. Lower SOS Shorter Wavelength •  Speed of Sound: The Distance Sound can Travel through the Water in a

Second •  Higher Frequency = Higher Resolution and Less Penetration in Softer Bottoms •  Lower Frequency = More Penetration in Softer Bottoms. Needed When

Surveys are Required in Deeper Water. Can potentially Aid in Separating Soft from Hard Bottoms

• Knudsen 1612 •  Top Side Unit. Brains of the Sounding •  Has low and High Frequency Modules •  Transducer Connects Directly to the Case •  Responsible for Sending and Receiving Voltage to/from the

Transducer •  Connects to any Computer via USB

2/6/17

3

• DGPS Setup •  Vessel Appropriate for Environmental Conditions •  Knudsen 1612 Sounder w/ Dual Frequency Transducer •  Trimble AG Receiver (DGPS) •  Hemisphere Dual Antenna System (DGPS) •  Panasonic Toughbook with Com Port •  Sound Speed Profiler

• RTK Setup •  Base Station or VRS •  R5 Survey Grade GPS (Position) •  R5 / DGPS Receiver GPS (Heading) •  Knudsen 1612 Sounder w/ Dual Frequency Transducer •  Sound Speed Profiler •  Panasonic Toughbook w/ Com Port

• Hypack •  Single Beam Data Collection / Processing •  Multi Beam Data Collection / Processing •  Dredgepack (Real Time Visual Aid) •  Chart Creation •  Volume Calculations

2/6/17

4

• Hypack Shell

• Sounder Suite (Knudsen Engineering Software) •  Sounder Suite Software Shows the User in Real Time Both the

Depths and the Along Track Bottom as the Vessel Advances

• Types of Surveys (Different Needs Call for Different Accuracies)

•  Pre / Post Dredge Bathymetry to Calculate Area Completion and Final Dredge Quantities for Environmental Remediation. (RTK)

•  Depth Measurements for Draft Purposes in Rivers and Harbors. (DGPS RTK)

•  Pre / Post Dredge Bathymetry to Calculate Area Completion and Final Dredge Quantities for Maintenance Dredging. (DGPS/RTK)

•  Recon Survey (DGPS) •  Client Driven

2/6/17

5

• Create Your Project •  Assign Proper Geodesy • Measure Vessel Offsets to Reference Point. Insert Offsets

Properly in to the Software • Obtain WSE of Current Tide or River Stage (either a Tide Board or

contacting a Tide Reference Station •  Load Files Related to the Survey • Create a Line file which runs Perpendicular to the Area. Line

Spacing Dependent on Level of Accuracy Needed and Distance of Survey

• Open Hypack Survey and Begin Data Collection

2/6/17

6

Setup Survey Software •  Loading Drivers

• Vessel Offset Measurements

•  Establish / Locate a Tide board or check Online for Nearest Tide Station and Log the Water Surface Elevation (WSE) Before, During and After the Survey

•  Create a Tide File in Hypack to Convert Collected Depths to Elevations in Post Processing