The pilot project used methods based on the 'Building with Nature' concept where environmental challenges are remedied through the use of naturally occurring resources. Working together with the various teams taking part in the pilot, we were involved in designing the pilot and reef, managing research on hydrodynamics, hosting workshops, and driving publicity for the project.
Dr. Petra Dankers, our senior consultant for morphology and eco-engineering explains on the background of the Bangladesh pilot. "Research carried out by IMARES in the Netherlands as part of the Building with Nature programme, proved that oyster reefs help improving coastal resilience, as sediment forms naturally behind oyster reefs. The aim of this pilot project was to find out if the method would work in a different part of the world."
To make this possible the team approached the Dutch Partners for Water for funding. Bangladesh was chosen because of its critical issue concerning climate change and its close ties with the Netherlands, which meant relationships were already established.
Our project leader, Alex Hooijer, explains how the pilot was set up. "After initial tests, relating to the ability of oyster spat (oyster larvae) to grow in this environment, had proven positive, a concrete reef structure was built along the coast of Kutubdia Island. In due time, this structure is expected to be covered with oysters, forming a natural reef. By monitoring biological parameters and measuring beach elevation, the effect and feasibility of such a reef was investigated. Community involvement of the islanders started in the preparation phase. Through early involvement and cooperation the pilot was embraced by the local people."
The project has demonstrated that oyster reefs can induce accretion of sediment on the lee side of the reef. As a result of the accretion behind the oyster reef, salt marsh and mangrove development can be enhanced. Dr. Dankers emphasizes that the effects of the reef are indirect.
Oyster reefs for sustainable coastal protection and mangrove stimulation:
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