In the Netherlands nature construction is quite common. Still, a lot is unknown about the optimal construction of various forms of nature. A good example of this is the optimal construction of intertidal zones and salt marshes.
Such areas serve as natural buffers for the water and, as such, for example, protect the land against flooding. In addition, these areas also yield recreational possibilities and ensure additional nature development.
Salt marshes are the higher, overgrown parts of the intertidal zone. In the provinces of Zeeland and Noord-Holland these parts are referred to as ‘schorren’, whereas in Groningen and Friesland the term ‘kwelders’ is more common. The very lowest parts of these marshes always flood at high tide, i.e. twice a day; the higher parts only flood at spring tide or in storms. Salt marshes have characteristic flora, with many species that are highly rare at other locations, such as sea lavender and glasswort. Salt marshes also form important breeding sites for ducks, waders and coastal breeding birds, such as seagulls and terns, and serve as a high water refuge for foraging birds.
Presently it is unknown whether, during nature construction, these trench structures could be constructed according to certain rules, in a way that optimizes the effectiveness and durability of these structures. Within the framework of the Geo Valley project, several organizations within GBP are working together on the research into these structures. The structures of the salt marshes are mapped by means of satellite images. The final report contains recommendations with regard to the structures in habitats and types of areas that can be constructed by man through nature construction.
