Laboratory tests of scour at a seawall

Sutherland, J. and Obhrai, C. and Whitehouse, R.J.S. and Pearce, A. (2006) Laboratory tests of scour at a seawall. In: ICSE 2006 (3rd International Conference on Scour and Erosion), 3-5 July 2007, Gouda, The Netherlands.

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Abstract

A set of medium-scale laboratory tests of wave-induced scour at seawalls has been performed in a flume at HR Wallingford. The methodology is presented along with test conditions and summarized results. The scour depth at the toe of the seawall is highly dependent on the form of wave breaking onto the structure. Sea states where waves plunge directly onto the wall generate jets of water that may penetrate to the seabed and cause a local scour hole immediately adjacent to the seawall. This is a different scouring mechanism to that observed in deeper water and is also absent when the seawall is well within the surf zone and most of the large waves have broken before they reach the seawall. Theoretical limitations are discussed.

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