Abstract
The nature-based concept of the Sandbar Breakwater was born based on the typical natural dynamics of the West African coast (Gulf of Guinea). Learning from the development and coastal impact of the existing port infrastructure in West Africa, the application of sand as a construction material for marine infrastructure seemed very obvious. Along this coast, ports experience heavy sedimentation at the western updrift side of the breakwaters, leading to the rapid burying of valuable armour rock. The Sandbar Breakwater concept is based on this principle by using natural accretion as the basis for the port protection. Such a concept is advantageous as a large sediment drift naturally supplements the sand lling works during construction and the required rock volumes are reduced signicantly, saving construction time and minimising the environmental impact. To counteract the downdrift coastal retreat, a replenishable sand engine completes the scheme. The realisation of a Sandbar Breakwater at Lekki, Nigeria, in 2018, with subsequent safe and continuous port operations, proves the feasibility of the concept. Sustainable future development is further pursued by integrated maintenance campaigns following the Building with Nature principles to guarantee the operability of the port while preserving the alongshore sediment balance and minimising the environmental impact.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/-1wCqqB9f8E
Highlights
CONCEPT The Sandbar Breakwater is a unique and innovative concept which follows the Building with Nature philosophy
The concept and design of the Sandbar Breakwater is based on the unique natural coastal system of Nigeria: regular swells arriving at the coast under a relatively constant angle in combination with a uniform steep and sandy coast resulting in a large and unidirectional longshore sediment transport
DESIGN The Sandbar Breakwater has been designed such that the initial placement of sand was minimized while the natural supply of sand, i.e. due to the alongshore sand drift around 900,000 m3/yr, was used to provide the long term stability of the Sandbar body
Summary
DESIGN The Sandbar Breakwater has been designed such that the initial placement of sand was minimized while the natural supply of sand, i.e. due to the alongshore sand drift around 900,000 m3/yr, was used to provide the long term stability of the Sandbar body. CONCEPT The Sandbar Breakwater is a unique and innovative concept which follows the Building with Nature philosophy. The concept and design of the Sandbar Breakwater is based on the unique natural coastal system of Nigeria: regular swells arriving at the coast under a relatively constant angle in combination with a uniform steep and sandy coast resulting in a large and unidirectional longshore sediment transport.
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