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Maritime Alliance Symposium

San Diego, August 2011

By: Michael Broadbent Fugro Pelagos Inc.

Seafloor Mapping Technologies

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Fugro Overview

• Fugro is an international surveying, geosciences, and geotechnical services company that collects and interprets data about the earth’s land masses and oceans.

– Large company with true global reach– Extensive and innovate capabilities– Unique world wide operational experience– Sole focus on mapping our planet

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• Uses sound (sonar) pulses to map the seafloor• Improvement on single beam (profiling) sonar• Methods and sensors able to map the deepest parts of the seafloor• Variable swath width (width vs. detail)• Some sensors capture backscatter intensity (snippets) allowing

imaging of the seafloor

Multibeam bathymetry creates swathes of survey data that map underwater surfaces and features

Vessel Based Multibeam Surveys

SB MB WA

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INTACT PIPELINE

Underwater Infrastructure

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Bathymetric Port/Harbor/Coastal Chart

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Sonar Backscatter (Side-Scan or Snippets)

Side-scan sonar (or snippets) can be utilized for creating an image of the floor of the water body/water course.

Data collected can help identify the composition and texture of the seabed/lakebed/riverbed.

Rock Piles

Ship Wreck

Ship Wreck

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Variety of different seismic systems for shallow and deep water investigations.

Provide valuable information regarding the sub-bottom geology for dredging or construction applications as well as evaluating sediment transport issues.

Marine Geophysics – Seismic Reflection

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Marine Geophysics

• Different seismic sources: chirp, boomer or spark• Different receivers: single/multi-channel• Data interpreted with core samples to produce geological maps

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Autonomous Underwater Vehicles

• Often designed for surveys down to

10,000’ below sea level

• Offer the most detailed surveys of deep

seafloor

• Vessel deployed or land deployed

• Variable sensor packages including:

• Bathymetric survey

• Sidescan Sonar

• Geophysical Profiling

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AUV Deep Water Advantages: Bathymetric Survey

• Better Bathymetry Data in Deepwater

• Hull-mounted vs. AUV Multibeam data

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Breakwater Survey: San Pedro, California

Angel’s Gate

Lighthouse

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Port Infrastructure

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Offshore Platforms & Terminals

• Annual Inspection

• Hurricane Damage

• Pre/Post Retrofit

• Clash Detection

• Decommissioning

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Airborne LiDAR Bathymetry

Airborne Bathymetric LiDAR

– Uses green and NIR laser

– Green laser penetrates the water column to 2 x Secchi depth

– Measures timing and intensity of returned laser pulse

– Simultaneous digital imagery

– Reduced risk, time, and cost compared to vessel based hydro surveying

– Requires clear water to operate

– Scans at 1 KHZ side to side to

produce swath coverage

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Airborne LIDAR Bathymetry Operational Concept

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CMP USACE NCMP

((1,000 m)…………..Hydro & Topo………(500 m)1,000 m)…………..Hydro & Topo………(500 m)

•Hydro – waterline to 1,000 m

•Topo – waterline to 500 m

•Imagery @ 20 cm resolution

•Hyperspectral

•Hydro – waterline to 1,000 m

•Topo – waterline to 500 m

•Imagery @ 20 cm resolution

•Hyperspectral

West Coast LiDAR Mapping

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Lidar Bathymetry Reflectance

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Jizan, Kingdom of Saudi Arabia

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Conclusion

• Right Tool for the Right Job:– Each project will have demands appropriate for a different survey

technology• Integrated Interpretation Strategy:

– Many features can only be properly characterised by the use of multiple data types

•www.fugro.com

Thank You!

Contact info:Michael Broadbentmbroadbent@fugro.com