The sand engine is an experiment in the management of dynamic coastline. It is run off South Holland in the Netherlands. A sandbar-shaped peninsula was created by humans; the surface is about 1 km². It is expected that this sand is then moved over the years by the action of waves, wind and currents along the coast. To protect the West of the Netherlands against the sea, the beaches along the coast are artificially replenished every five years, and it is expected that the sand engine will make replenishment along the Delfland Coast unnecessary for the next 20 years. This method is expected to be more cost effective and also helps nature by reducing the repeated disruption caused and rereplenishment.
For the first time in 2011 at the request of the Hoogheemraadschap van Delfland as part of the coastal management and the maintenance of the coastline by the highways and the province of South Holland, a peninsula was created between Ter Heijde and Kijkduin, where natural beaches and dunes are relatively narrow.
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