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Hydrographic Surveying at The Port

of London

John Dillon-Leetch

Port and Terminal Technology 200914th October, Antwerp

Overview

• Introduction• Surveying the Thames• Navigational Charting• High Resolution and 3D Visualisation• New Developments & Projects – 2009• Conclusions

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Why have a Hydrographic Survey Capability ?

STATUTORY RESPONSIBILITIES

• Port of London Act Part III Section 7….shall make and publish hydrographic surveys

• Port Marine Safety Code Section 2.3

PilotageMarine Services/SalvageVTSChartsWrecks / ObstructionsTidal DataRiver (Main) SurveysTidal Monitoring / AnalysisDredgingEnvironment River RegimePlanning

NAVIGATIONAL SAFETY

CONSERVANCY

STATUTORY RESPONSIBILITIES

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Hydrographic Service –Customers (internal)

Marine Services:PositioningElectronic ChartingDive Support

Licensing & Legal:Planning & Historical review

River Regime and Environment:Dredging / samplingFlow measurement

The Port of London – Key Info

• 96 miles of tidal river.• 400 sq. miles of river/sea bed.• 30,000 shipping movements per year.

• Major river associated developments– (2009 – 2020)

• 500 hydrographic surveys per year.

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Hydrographic Department

• Three survey vessels• 14 Staff

– wide range of disciplines and backgrounds

• High resolution multibeam echo-sounders• Motion Sensors & GPS• 3D Processing software• £600K Investment since 2005

YANTLET

VERIFIER

BRENT

Continue

Galloper

Survey Craft

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Surveying Technology

Navigational Charting – Core Deliverable

• Data populates large scale UKHO charts

• Recently launched :– Small Craft Chart Folio

• In Development– Electronic Charts

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Multibeam Survey Capability since 2004

• New Technologies New Software• Value Added In House: New Visualisations and Delivery

Methods for Harbour Masters, Engineers.• Proofing Modelled Outcomes.• Investment in equipment to be justified

Berth Survey – High Resolution .

System can measure depths beneath structures & vessels

Scour

Visualisation Capability

•Controlling Depths•Slope Stability•Speed of survey 5 times faster than SBES resulting in little or no berth downtime

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Bridge Pier Monitoring

• Baseline Assessment• Post Works

Clearance• Inspection• Scour Monitoring• Bed Protection

Assessment & Volume calculations

• Reporting

Pipeline Scour

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Data Clients

Harbour Masters ,Berth Owners & MarinersEnvironmentalistsGeologistsArchaeologistsSalvors / DiversPolice/ SecurityEngineers – Hydrodynamic & Civil

Developing Uses of MBES

• Standard Port use delivering high accuracy & repeatability.

• Extending this to vertical Structures involved quantifying achievable accuracies and deliverable results

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Assessing the System CapabilitiesBusiness Development Perspective: Could it do what it said on the tin?

DiverReplacement/Augmentation ?

• Tangible Results.• Powerful Project Support

Capability.• Safe & Non Intrusive

methodology• Augment or replace Dive

Surveys.• Fast Turnaround &

Delivery• Good value for money.

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Quay Wall Survey Monitoring -2006

• From Minor erosion to major deformation

• Scheduled for 31 days dive time with associated plant and support.

• MBES survey 7 Kms of Breakwater in two days

• Two Months processing !

Experimentation of amalgamation with other data sources.

• Proves system & makes data interpretation easier for non-surveying client.

Multibeam data knitted to surface photography

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Civil Engineering Support

• Potential Uses of Technology– Baseline Surveying– Structure examination– Site Investigation– Wall Condition Surveys:

Pre/Post Works

• Free-viewing software methodologies

• Powerful Project support capability.

• Value Added particularly to non-surveyors

Proving the System Canary Wharf: July 2007

• Joint Venture with Engineering Diving Company

• Survey Specs : +/- 3cms in XY and +/- 7cms in Z.

• Identification of anomalies such as damage, cracks, distortions, abnormalities or other defects of +/-5cms in extent

• 99% correlation between MBES and Diver survey for all quay walls.

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• Feature Information• Feature ID: WWharf_021• Wall: Wood Wharf 5• Easting: 537961.44mE• Northing: 180134.27mN• Chainage: 65m• Depth: 2.75-3.80m• Recess: 0.10m• Length: 0.20m• Notes: Vertical recess in wall

2 Missing Bricks !

High Resolution Data X-Sections

• Profile Information• Profile ID: WWharf_P02• Wall: Wood Wharf 2• Chainage: 20m• Gradient: 88 degs• Notes: Wall in good condition.

• Profile Information• Profile ID: WWharf_P05• Wall: Wood Wharf 2• Chainage: 119m• Gradient: 92 degs

• Notes: This wall section is just to the west of the ladder and has severe damage to the top two-thirds with recesses of up to 0.4 m. The wall is also overhanging slightly at this point which might indicate that it is being pushed from behind.

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Fully Amalgamated Sub-Marine

Datasets

Laser Scanning – 2008

• Idea to acquire tangible survey leverldata for above and below waterline from one platform

• Data was cleaned up in Pointools & Fledermaus Edit to remove stray points and false objects in the scans ( cars, boats, people, and filter data if necessary.

• Static scanning produces 10-15mm spacing on surfaces where possible. Boat based 2-10cms dependant on boat speed.

• One visit- Multiple data products giving High Multiple client value

Riegl Laser mobilised to PLA survey vessel Galloper (Aug ’08)

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Early Laser Data Examples - 2008

• Westminster Area Overview

Savoy Pier Scan Imagery

Laser Scanning – 2009Centrica Gas Field

• Optech ILRIS HD• Robust, fully portable laser

based ranging and imaging system.

• On board 6MP digital camera.

• 20mm ranging accuracy, 10,000 samples/sec,

• 80 degree view

•Potential in Offshore Oil and Gas, Renewables and Coastal Resource Management

•Engineering Maintenance

•Asset tracking surveys

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Laser Data Examples - Platform

•Working deck clearance measurements for operator license

•Production of 3D Model based on accurate survey measurements

Amalgamated Datasets MBES/Laser

•Seabed, Water Column and Topside amalgamated data set

•Free 3-D visualisation s/w deliverable.

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Detailing and Inspection Capability

Land/Water Interface

• Applications for:-

– Remote- Non-Intrusive Surveying

– Environmental monitoring– Foreshore/Intertidal Erosion– Security– Asset Tracking– GIS Source Data

• One Visit multiple data

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CONCLUSIONS

Performing surveys using Multibeam technology significantly reduces the time it takes to inspect and survey.

Data is collected at a much higher resolution than is possible using traditional manual profiling.

There are much lower HSE risks associated with vessel based surveys.

Vessel borne surveys collect high density data in inaccessible areas by air or land due to the different viewing aspect.

Combined Multibeam and Laser scanning data increases value added

Accuracy, Precision and repeatability reaching structural survey levels

3D visualisation significantly enhances the products produced and aids the analysis and presentation of the data’

Accurate remotely sensed data deliverables can be extracted from the products

www.pla.co.uk

Questions?