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Building with Nature Guideline > Building Solutions > Sandy solutions > Feeder beaches 

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Feeder beaches

 

This building solution covers the spatially concentrated placement of (relatively) large sand volumes for coastal development. Such nourishments are placed at a specific location with the aim to gradually feed the surrounding coast. Wind, waves and currents will spread the sediments along the coast, which is a typical example of 'building with nature'. Such a nourishment will contribute to the coastal safety in the long-term while creating more opportunities for nature and recreation.

 

An emerged concentrated nourishment along a sandy shore, whereby part of the nourishment is dry, provides more space for recreation, water sports and beach lovers. In addition, new dunes and vegetation could develop, increasing nature value. In case of an unprotected (non-enclosed) nourishment, the shape and bathymetry of the nourishment will however change continuously under the forcing of tide, wind and waves. This requires an adaptive management strategy to anticipate on unforeseen developments. The Sand Motor Delfland is a good example of an integrated solution providing safety against flooding while facilitating nature development and recreation.

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How to use

 

To determine the feasibility and design of a concentrated nourishment for coastal development, guidance is presented below. First, the feasibility of a concentrated nourishment for coastal development is assessed using a rule-of-thumb method. Subsequently, a preliminary design of the concentrated nourishment is determined using simple (interactive design) tools including parameterization. For appropriate detailing and a geometric design more advanced tools (like process-based models) are available to be applied.

This building solution is mainly applicable in the initiation and planning and design phase.

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Practical applications

 

Sand nourishment in the form of feeder beaches has been applied along Dutch coastlines for several decades. It is not surprising therefore, that there are a large number of example projects to be mentioned here.

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 References

 


 

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