20100212 port of ehoala – design of navigation works updated [compatibility mode]

Building on the Past, Respecting the Future

Port of Ehoala Design of Navigation Works

Trevor Elliott, P.Eng.Brent Sumner, P.E.

Building on the Past, Respecting the Future

Presentation Outline• Introduction

– Ilmenite export– Harsh wave environment

• Port Layout

• Navigation Plan– Design vessels– Channel alignment– Design depths & dimensions

• Aids to Navigation– Range towers (leading lights)– Beacons– Buoys

• Closing Remarks

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Building on the Past, Respecting the Future

Introduction – Project Location

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Building on the Past, Respecting the Future

Ilmenite Export

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• Black Sand to White Pigment

Building on the Past, Respecting the Future

Why navigation works are important

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Building on the Past, Respecting the Future

Fausse Baie des Galions (full of reefs)

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Building on the Past, Respecting the Future

Port Layout

• Main Elements– Breakwater

– Quay

– Dredging & reclamation

– Navigation works

– Coastal structures

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Building on the Past, Respecting the Future

Design Vessels

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Bulk Carrier 20,000 DWT 60,000 DWT

Length overall (LOA) 155 m [509 ft] 225 m [738 ft]

Beam (B) 23 m [75 ft] 32.2 m [106 ft]

Loaded Draft (T) 9 m [30 ft] 12.7 m [42 ft](10 m @ 2/3rd laden)

Building on the Past, Respecting the Future

Channel Alignment

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Building on the Past, Respecting the Future

Dredge DepthsBerth Area Navigation Channel Turning Area

LAT (below MSL) 0.3 0.3 0.3Loaded Draft 12.7 12.7 10Gross UKC 2.45 (20%) 3.7 (30%) 2.9 (30%)

Survey Tolerance 0.3 0.3 0.3MSL DEPTH ‐15.75m [52 ft] ‐17.0m [56 ft] ‐13.5m [44 ft]

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Building on the Past, Respecting the Future

Dimensions• Departure Channel

– Width based on PIANC (1997)– Bulkers: poor manoeuvrability

– One-way = 4.5·B– Width = 150 metres (492 ft)

• Turning Area– Tug assistance (2 @ 45 tonne bollard pull each)

– 1.5·LOA (ship’s anchor + tugs)– Diameter = 340 metres (1,115 ft)

• Tested in real-time navigation simulator

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Building on the Past, Respecting the Future

Navigation Simulations - Swept Track Plot

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Building on the Past, Respecting the Future

Aids to Navigation

• Designed to IALA guidelines, Region A• Principal components

– 4 Range Towers (Leading Lights)– 6 Fixed Beacons – 1 Special Mark, 5 Lateral Marks– 5 Lateral Mark Buoys – 2 Can, 3 Nun– 2 Special Mark Buoys– 3 Cardinal Buoys

• Port Control Tower

• Evaluated in navigation simulations

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AB

Building on the Past, Respecting the Future

Range Towers• Two sets of ranges

– Outer on entering bay– Inner on approach to berth

• Designed to USCG and IALA guidelines

• Dayboards + leading lights• Steel monopole and

concrete mat foundation– Largest tower 47m (154 ft tall)

• Cyclone wind speed– Gust 241 km/h (130 knots)

• Corrosion protection system• Aviation safety (light + paint)

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Building on the Past, Respecting the Future1515

R

M

CW

Range Towers

Building on the Past, Respecting the Future

Fixed Beacons• Quay structure (3)

– Primary berth• Manifold - ATEX Zone 2

– Secondary berth

• Groin (1)• Breakwater (2)

– Roundhead– Trunk at entrance to

secondary harbor

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Building on the Past, Respecting the Future

Buoys• Navigation buoys

– Cyclone waves Hs=8m/26ft– Diameter 2.5m/8ft– Conventional lantern optics

• Lateral mark buoys (5)– Located at outer limits of turning

area– Gated Pair midway either side of

departure channel– End of turn marking reef

• Cardinal buoys (3)– 1km opening at center of bay

Mark named side of buoy• Special mark buoys (2)

– End of dredge pocket– ATEX Zone 2

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Building on the Past, Respecting the Future18

Aids to Navigation - Plan

Building on the Past, Respecting the Future

Closing Remarks• Construction completed July 2009• Handed over to port operator• 60 vessels in first 6 months• Ilmenite export

– Largest: 55,000 DWT bulk carrier

• Fuel delivery– Largest: 47,000 DWT tanker– Regional distribution hub

• Container traffic– Feeder vessels up to 1,100 TEU

• Other– Patrol boat, oceanographic vessel– Shiploader delivery vessel

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Building on the Past, Respecting the Future

Thank You

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