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It has been suggested that vertical perforated tubes placed below the beach surface will increase the drainage of the beach, and hence increase the deposition of sand on the beach. The system is called the PEM-system, Pressure Equalization System, and the Danish company SIC ( is doing the marketing. Although it for a coastal engineer seems obvious that such a device can’t drain the beach (nearly no driving forces ), SIC has succeeded in installing the system in more than 75 locations around the world (according to the company). In Denmark a full scale experiment at the exposed west coast has been performed through 2005-08, and a similar Dutch test is going on right now at Egmond, Holland. In this paper, we model the flow in the beach taking into account the presence of (high-permeable) tubes and demonstrate that the drainage effect is negligible. Further, the morphodynamic behavior of the coast in relation to the Danish field test is described, and it is concluded that all morphological changes can be explained by natural causes.
Original languageEnglish
Title of host publicationProceedings of Coastal Dynamics 2009
VolumeChapter 40
Place of PublicationSingapore
PublisherWorld Scientific
Publication date2009
ISBN (print)978-981-4282-46-8
StatePublished - 2009
EventCoastal Dynamics 09 -


ConferenceCoastal Dynamics 09
Period01/01/2009 → …
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