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Read these excerpts from the overwhelmingly positive conclusions from studies about the effectiveness of porous groins...
The University of Florida laboratory experiments determined the major influence of permeable wood groins on the littoral system is the reduction of the longshore current velocity and sediment transport capacity within their reach. The beach profile responses to pile cluster groins included updrift and downdrift deposition, bar formation and seaward translation, and shoreline advance. Dean, R.G., Mulcahy, S., Poff, M.T., Stephen, M.F. Permeable Wood Groins: A Case Study and Experiment on Their Impact to the Coastal System. Proceedings from the 2001 National conference on Beach Preservation Technology, pp. 233-248.
There seems little doubt that the two Makepeace wood groynes constructed at Bournemouth have resulted in a build-up of the beach in their immediate vicinity. Although erosion would be expected downdrift, it is not immediately obvious. Price, W.A., Tomlinson, K.W., Willis, D,H. (1972). Field Tests On Two Permeable Groynes. Proceedings from the 13th International Coastal Engineering Conference, Vol. 2, pp. 1401-1408.
The shoreline translates parallel to the original shoreline seawards until a balance is reached between onshore and offshore transports. Raudkivi, Arved J. (1996) Permeable Pile Groins. Journal of Waterway, Port, Coastal, and Ocean Engineering, Vol. 122, pp. 267-272.
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