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Designing Dredgers with Appropriate Technology: Minimizing Environmental Impact

This article explores the integration of appropriate technology in the design and operation of new dredgers, focusing on minimizing social and environmental impacts. It outlines principles of appropriate technology, highlighting efficient design, material selection, and operational methods. Emphasis is placed on using modern design tools, optimal fleet management, and compliance with regulations to create dredgers that adhere to sustainable practices. The holistic approach ensures that the technology applied is effective, efficient, and considerate of its ramifications on communities and ecosystems.

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Designing Dredgers with Appropriate Technology: Minimizing Environmental Impact

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  1. The use of Appropriate Technology in the design of new dredgersir.Robby de Backer, ir.Frederik DerooJan De Nul N.V.

  2. APPROPRIATE TECHNOLOGY:Technology or engineering that takes special consideration of its social and environmental ramifications. Traditional view: • Simple, efficient technology, using limited resources. • Immediately applicable in daily life. • Mostly applied to developing countries.

  3. APPROPRIATE TECHNOLOGY:Technology or engineering that takes special consideration of its social and environmental ramifications.Applied to Dredging. • Use design, materials and equipments with lowest possible social and environmental negative impact in the design and construction of Dredgers. • Use design, materials and equipments with lowest possible social and environmental negative impact during the operation of Dredgers. • Use operational methods with lowest possible social and environmental negative impact during execution of the project.

  4. APPROPRIATE TECHNOLOGY:Technology or engineering that takes special consideration of its social and environmental ramifications.Applied to Dredging. Compliance with the principles of Appropriate Technology • Holistic approach. • AT = Efficient Dredgers (social aspect ?)

  5. Investment plan 2007-2011(ordered)

  6. APPROPRIATE TECHNOLOGY:Technology or engineering that takes special consideration of its social and environmental ramifications.Applied to Dredging. • Design and construction of a Dredger. • Conceptual design. • Material selection. • System design. • Energy & emissions. • Operational methods of a Dredger. • Optimal fleet management. • Rules & regulations. • Cost.

  7. APPROPRIATE TECHNOLOGY:Technology or engineering that takes special consideration of its social and environmental ramifications.Applied to Dredging. Design and construction of a dredger: • Conceptual Design: EFFICIENCY, APPLICATION OF MODERN DESIGN TOOLS, ADVANTAGE OF “YOUNGER” VESSELS

  8. Specific Power [kW/kn*ton] for hopperdredgers 2000 to 5000 m3

  9. Specific Power [kW/kn*ton] for Jumbo hopperdredgers

  10. Ratio Deadweight/Light Ship Weight for Jumbo Hopperdredgers

  11. Ratio Light Ship Weight/L*B*H for Jumbo Hopperdredgers

  12. APPROPRIATE TECHNOLOGY:Technology or engineering that takes special consideration of its social and environmental ramifications.Applied to Dredging. Design and construction of a dredger: • Conceptual Design: EFFICIENCY, APPLICATION OF MODERN DESIGN TOOLS , ADVANTAGE OF “YOUNGER” VESSELS • Material Selection: CRITERIA FOR “AT” COMPLIANCE ARE REQUIRED

  13. APPROPRIATE TECHNOLOGY:Technology or engineering that takes special consideration of its social and environmental ramifications.Applied to Dredging. Design and construction of a dredger: • Conceptual Design: EFFICIENCY, APPLICATION OF MODERN DESIGN TOOLS , ADVANTAGE OF “YOUNGER” VESSELS • Material Selection: CRITERIA FOR “AT” COMPLIANCE ARE REQUIRED • System Design: EFFICIENCY

  14. APPROPRIATE TECHNOLOGY:Technology or engineering that takes special consideration of its social and environmental ramifications.Applied to Dredging. Design and construction of a dredger: • Conceptual Design: EFFICIENCY, APPLICATION OF MODERN DESIGN TOOLS , ADVANTAGE OF “YOUNGER” VESSELS • Material Selection: CRITERIA FOR “AT” COMPLIANCE ARE REQUIRED • System Design: EFFICIENCY • Energy & Emissions: EFFICIENCY

  15. APPROPRIATE TECHNOLOGY:Technology or engineering that takes special consideration of its social and environmental ramifications.Applied to Dredging. Operation of a Dredger: • Optimal fleet management: USE THE MOST APPROPRIATE DREDGER

  16. Project parameters Dredged spoil: medium to fine sand, D50=150 mu Dredging depth: 15 m Sailing distance from dredge site to disposal site: 15 Nautical Miles Disposal method: Bottomdoor dumping Total amount of spoil to be dredged: 1 000 000 m3 Maximum loaded draught due to local constraints: 8 m

  17. APPROPRIATE TECHNOLOGY:Technology or engineering that takes special consideration of its social and environmental ramifications.Applied to Dredging. Operation of a Dredger: • Optimal fleet management: USE THE MOST APPROPRIATE DREDGER • Regulations: “HOLISTIC APPROACH”, USE OBJECTIVE PARAMETERS

  18. Project parameters Dredged spoil: medium to fine sand, D50=150 mu Dredging depth: 15 m Sailing distance from dredge site to disposal site: 15 Nautical Miles Disposal method: Bottomdoor dumping Total amount of spoil to be dredged: 1 000 000 m3

  19. APPROPRIATE TECHNOLOGY:Technology or engineering that takes special consideration of its social and environmental ramifications.Applied to Dredging. Operation of a Dredger: • Optimal fleet management: USE THE MOST APPROPRIATE DREDGER • Regulations: “HOLISTIC APPROACH” • Cost: “COST” OF SIDE-EFFECTS TO BE TAKEN INTO ACCOUNT ?

  20. APPROPRIATE TECHNOLOGY:Technology or engineering that takes special consideration of its social and environmental ramifications.Applied to Dredging.CONCLUSIONS • New design tools needed. • Holistic principle. • Importance of a modern, versatile fleet.

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