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Showing papers on "Groyne published in 1975"


01 Oct 1975
TL;DR: In this article, the local scour at the head of a groyne is discussed and a review of the current literature is summarized in the form of a recommended design procedure.
Abstract: Types of groynes are described and illustrated. Factors to be considered in the design of a groyne installation are discussed, with emphasis on the local scour at the head of a groyne. Scour estimation methods are discussed and ilustrated. Results from a review of the current literature are summarized in the form of a recommended design procedure. Recommendations for future study and research are also given.

3 citations


01 Jan 1975
TL;DR: In this paper, the effects of accretion against the Tweed River Training Walls constructed in 1962-65 are causing losses of sand from the southern Gold Coast beaches, and the measured overall net loss of 197,000m from the investigation area compares with the predicted loss of 158, 000m.
Abstract: In 1972 a 180m long groyne was built at Kirra Point. The beach and seabed adjacent to the groyne have been surveyed regularly to determine its effects on the local beach processes. Coolangatta Beach on the updrift side of the groyne has accumulated 306, 000m of sand along 640m of beach in two years. At Kirra Beach on the downdrift side of the groyne, 503, 000m has been eroded from 1800m of beach in the same period. It is clear that the effects of accretion against the Tweed River Training Walls constructed in 1962-65 some 2500m updrift of Kirra Groyne are causing losses of sand from the southern Gold Coast beaches. The measured overall net loss of 197,000m from the investigation area compares with the predicted loss of 158,000m. Surveys prior to the groyne construction (1968-71) confirm a measured net loss of 371, 000m compared with the predicted 330, 000m for that period. Although the initial rate of accretion updrift of the groyne was higher than expected, it appears that the calculated littoral transport of 208,000m /year for the Kirra area may be low, based on the estimation that 65% of the transport occurs within the zone of influence of the groyne. The higher rate of build-up initially is believed to be the result of large short term fluctuations in the littoral supply to the area.

2 citations