Project part-financed by the European Union (European Regional Development Fund)

The Interreg IVB North Sea Region Programme

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Ketenisse wetland - small scale tidal wetland restoration in the brackish part of the estuary

Crux of the matter

The creation of new ecological valuable intertidal wetlands can contribute to estuarine restoration as it enables habitat development and biodiversity. Success factors are related to the improvement of estuarine processes (such as sedimentation-erosion, creek formation and soil development).
Ketenisse was however not a complete success. The steeper parts of the site showed net erosion and seemed less functional as habitat. If the central slope would have been excavated according to plan sedimentation/erosion and habitat development would have been quite different (Van den Neucker et al. 2007). There would have been relatively less mudflat with a long exposure time. On the other hand, habitat diversity and gradual transitions might have been more elaborate.
The applied monitoring scheme seems to be adequate to monitor the developments on the new site, even though it is rather labour-intensive (Van den Bergh 2005). Developments on levelled sites start shortly after the end of the works, therefore it is important to monitor intensively in the early stages. The monitoring frequency is evaluated yearly and, if necessary, adjusted to the developments on the site (Van den Bergh 2005).
Knowledge gaps are related to the contribution of the different variables that contribute to the changes in elevation, and taking into account the impact of local estuarine characteristics such as sediment balance and wave impact.

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Important to know

Reports / Measures / Tools

Report: Management measures analysis and comparison