NMDC and Etermar Deliver UAE’s First Caisson-Based Quays: A New Era in Marine Infrastructure

In a landmark achievement for the UAE’s maritime sector, Abu Dhabi-based National Marine Dredging Company (NMDC) and Portuguese marine engineering firm Etermar have successfully completed the nation’s first caisson-based quay construction. This pioneering project introduces a sustainable and efficient approach to marine infrastructure, setting new standards in the region.

Project Overview

• Location: Artificial offshore island, Abu Dhabi

• Scope: 600 linear metres of berth constructed using 16 reinforced concrete caissons (2 x 300m quay walls)

• Purpose: To accommodate mega yachts exceeding 100 metres in length

• Timeline: Completed in just five months

• Workforce: Approximately 190 multinational workers, with about half being Portuguese nationals

The project was executed on an artificial island designed and built by NMDC, aiming to berth some of the world’s largest mega yachts. The rapid completion within five months underscores the efficiency of caisson-based construction methods.

Delivery Partners

• NMDC Group: Served as the main contractor, responsible for the overall project execution, including the design and construction of the offshore island, dredging, reclamation, breakwater, revetment, beach profiling, and quay wall construction.

• Etermar Engenharia: A Portuguese marine engineering company specializing in floating concrete structures. Etermar was instrumental in introducing caisson technology to the UAE, handling the design and installation of the caissons.

Technical Approach

The project utilized 16 reinforced concrete caissons, each forming part of the two 300-metre quay walls. These caissons were constructed locally at Mina Zayed Port on a floating dock mobilized from Portugal by Etermar. Once completed, they were towed to the project site and installed offshore. The construction also included the detailed design of capping beams, scour protection systems, and foundation trenches.

Risk Analysis

• Technical Risks: The precision required in placing massive caissons posed challenges. However, the use of advanced marine equipment and experienced crews mitigated these risks.

• Environmental Risks: Potential disturbances to the marine ecosystem during dredging and installation were addressed through comprehensive environmental monitoring and the implementation of eco-friendly construction practices.

• Logistical Risks: Transporting large caissons from the construction site to the offshore location required meticulous planning to avoid delays and ensure safety.

Impact Analysis

Economic Impact:

• The project has enhanced Abu Dhabi’s capability to accommodate mega yachts, potentially boosting luxury maritime tourism and associated economic activities.

Operational Impact:

• The successful implementation of caisson-based construction demonstrates a viable alternative to traditional methods, offering faster construction times and potentially lower maintenance costs.

Environmental Impact:

• The use of precast caissons minimizes underwater noise and sediment disturbance compared to traditional piling methods, aligning with sustainable construction practices.

Strategic Significance

This project marks a significant milestone in the UAE’s maritime infrastructure development, showcasing the successful adoption of innovative construction techniques. The collaboration between NMDC and Etermar not only delivered a state-of-the-art facility but also set a precedent for future marine projects in the region. The project’s success reinforces the UAE’s position as a leader in adopting sustainable and efficient construction methodologies.