Hydrographic Surveying at The Port of London

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1 Hydrographic Surveying at The Port of London John Dillon-Leetch Port and Terminal Technology th October, Antwerp Overview Introduction Surveying the Thames Navigational Charting High Resolution and 3D Visualisation New Developments & Projects 2009 Conclusions 1

2 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 STATUTORY RESPONSIBILITIES NAVIGATIONAL SAFETY CONSERVANCY Pilotage Marine Services/Salvage VTS Charts Wrecks / Obstructions Tidal Data River (Main) Surveys Tidal Monitoring / Analysis Dredging Environment River Regime Planning 2

3 Hydrographic Service Customers (internal) Marine Services: Positioning Electronic Charting Dive Support Licensing & Legal: Planning & Historical review River Regime and Environment: Dredging / sampling Flow 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 ( ) 500 hydrographic surveys per year. 3

4 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 VERIFIER Survey Craft Galloper YANTLET BRENT Continue 4

5 Surveying Technology Data populates large scale UKHO charts Recently launched : Small Craft Chart Folio In Development Electronic Charts Navigational Charting Core Deliverable 5

6 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. Scour System can measure depths beneath structures & vessels Controlling Depths Slope Stability Speed of survey 5 times faster than SBES resulting in little or no berth downtime Visualisation Capability 6

7 Bridge Pier Monitoring Baseline Assessment Post Works Clearance Inspection Scour Monitoring Bed Protection Assessment & Volume calculations Reporting Pipeline Scour 7

8 Data Clients Harbour Masters,Berth Owners & Mariners Environmentalists Geologists Archaeologists Salvors / Divers Police/ Security Engineers 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 8

9 Assessing the System Capabilities Business Development Perspective: Could it do what it said on the tin? Diver Replacement/Augmentation? Tangible Results. Powerful Project Support Capability. Safe & Non Intrusive methodology Augment or replace Dive Surveys. Fast Turnaround & Delivery Good value for money. 9

10 Quay Wall Survey Monitoring 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. Multibeam data knitted to surface photography Proves system & makes data interpretation easier for non-surveying client. 10

11 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. 11

12 Feature Information Feature ID: WWharf_021 Wall: Wood Wharf 5 Easting: mE Northing: mN Chainage: 65m Depth: m 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. 12

13 Fully Amalgamated Sub-Marine Datasets Laser Scanning 2008 Riegl Laser mobilised to PLA survey vessel Galloper (Aug 08) Idea to acquire tangible survey leverl data 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 13

14 Early Laser Data Examples Savoy Pier Scan Imagery Westminster Area Overview Laser Scanning 2009 Centrica Gas Field Potential in Offshore Oil and Gas, Renewables and Coastal Resource Management Engineering Maintenance Asset tracking surveys 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 14

15 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. 15

16 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 16

17 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 Questions? 17

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