Ecological system IJmeer-Markermeer
Posad designed an alternative futureproof ecological system for the Markermeer-IJmeer. The design consists of placing artificial aquatic plants, the creation of stepping stones by using floating constructions, making a swamp using peat mats and the realization of ten places for fish to migrate between the Markermeer-IJmeer and the regional water system.
These measures encourage the natural processes in motion. The artificial structures function as a catalyst and may eventually be removed.
The Markermeer-IJmeer is a large freshwater lowland lake next to Amsterdam, which is naturally rich in silt. Due to its large scale this area has a large potential for the growth of plants and to be inhabited by animals. Furthermore the lake is located along international bird migration routes and has many ecological relationships with surrounding wetlands. Birds are therefore seen as an indicator for the quality of the ecological system.
Most of the naturally occurring habitats in the land-water zones of a lowland lake missing in the Markermeer. As a result of the absence of these biotopes spawning and nursery sites for fish are missing.
The overall design is based on a swamp of 1,500 ha which will be realised within 40 years in the small scenario variation. The large scenario consists of 4,500 hectares of wetland realized within 60 years. Together with the islands as stepping stones along the Flevoland coast a very large land-water zones will arise. The marsh will gradually be built up with peat mats and sludge from the Markermeer-IJmeer itself. This sludge will be collected in deep wells and transported as geotubes to the location of the swamp.
Client: Operating company IJmeer-Markermeer
Collaborators: Posad Spatial Stategies, Tauw, Robusta, Tebezo