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At the far northeast coast of the Netherlands, salt marshes are developed with sediment from the port of Delfzijl and the Eems-Dollard estuary. Salt marshes are a valuable nature area that also mitigate the effects of subsidence and sea level rise.

At this test site EcoShape can acquire knowledge about the successful development of natural salt marshes.

The project was commissioned by the municipality of Delfzijl and it is part of the ‘Marconi Buitendijks’ regional development effort, which addresses a number of major issues faced by the municipality: a shrinking population, sea level rise combined with subsidence and the poor ecological condition of the Ems-Dollard.

The municipality of Delfzijl initiated the project in response to a study of promising solutions involving Building with Nature (see report below on this page).

Goal

The aim is to investigate the best way to restore salt marshes by reusing sediment, while developing nature that contributes to the water quality, ecology, coastal defences and the attractiveness of the coast.

Salt marsh development Marconi Delfzijl 3

Research

The experiments uses different percentages of sand and fine sediments as base-layer for the salt marshes. Various types of wave-attenuation structures are tested such as semi-permeable barriers and boulder clay. Tests are also being carried out with samphire seed, either sowed or supplied naturally to stimulate development of the salt marshes.

Research

In May 2019, the research team sowed salicornia. In October 2019 the salt marsh was full of salicornia plants. The researchers talk about the experiment, their expectations and the surprises.

Results

The trial will generate knowledge about how salt marshes can be created, developed or restored with local material, under difficult circumstances.

First observations on the pioneer salt marsh near Delfzijl 4

Test site

The test site has several sections that vary in soil composition and natural versus sown salicornia plants.

More information

Sustainable area development Port of Delfzijl
Petra Dankers
Project Manager

Partners

EcoShape was appointed by the municipality of Delfzijl to study salt-marsh development. The Wadden Fund has provided financial support for knowledge development relating to salt-marsh construction. The remaining amount is financed by the EcoShape partners themselves.