Wave overtopping and toe scouring at a plain vertical seawall with shingle foreshore: A physical model study

OCEAN ENGINEERING

卷:171

Article

Salauddin, M.¹  Pearson, J. M.¹ 

[1] Univ Warwick, Sch Engn, Coventry CV4 7AL, W Midlands, England

关键词: Overtopping;    Scouring;    Shingle foreshore;    Impermeable foreshore;    Vertical seawalls;    Sediment discharge;   

DOI  :  10.1016/j.oceaneng.2018.11.011

来源: Elsevier

【 摘 要 】

This paper describes a physical model study to investigate the wave overtopping and toe scouring at a plain vertical wall with a shingle foreshore. A matrix of 180 experimental test conditions were performed in a 2D wave flume, with an approximate scale of 1:50. The study investigates the baseline overtopping characteristics at a plain vertical wall on an impermeable 1:20 foreshore slope and compares the results with two permeable 1:20 shingle beach foreshores with prototype d(50) values of 13 mm, and 24 mm respectively. For impulsive wave conditions, it was found that the mean overtopping rate was reduced by factor 3 for the d so of 13 mm, and a factor of 4 for the d(50) of 24 mm. For non-impulsive waves, the reduction factors were 1.5 for d(50) of 13 mm and 2 for d so of 24 mm. Prior to this study, limited design guidance was available to predict the mean overtopping discharges and mean sediment rates at vertical seawalls on permeable shingle foreshores. Therefore, a new set of prediction formulae are proposed in this study, based on the new laboratory test results, and a comparison with the available prediction methods in literature for vertical seawalls subjected to both impulsive and non-impulsive wave conditions.

【 授权许可】

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