single beam data collection final pp · • survey intern for brennan the summer of 2009 •...
Post on 23-Jul-2020
0 Views
Preview:
TRANSCRIPT
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
top related