Abstract
Rock or boulder groynes are an increasingly popular option for constructing groynes with the purpose of maintaining beach levels within the groyne compartment created. Due to the open blockwork nature of construction, rock groynes are permeable to water and sediment in contrast to either concrete or timber groynes. No data exists on the rate at which mixed sediment beach material penetrates through rock groynes, yet they are used as terminal features in groyne fields or are used to maintain discontinuities in coastal alignment. On the basis of beach volumes calculated from aerial photographs and ground surveys over different time intervals and covering more than five years, examples from two coast protection schemes in south-east England show that where the beach levels on either side of the rock groyne differ, the rate of throughput is almost constant and independent of wave approach. Measured rates of transport can reach up to 1·27 m3 per day. Throughput is a function of the gradient between the beaches on either side which is determined by the cross-sectional area between the two beach profiles. An exponential relationship between the differences in cross-sectional areas either side of the rock groyne and rate of throughput is proposed.
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