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- W65780487 abstract "Laboratory measurements of sand barrier dynamics are presented in terms of sediment transport or morphology changes through (i) wave only and (ii) combined wave and current cases. Wave transformation and velocity profiles over the sand barrier are also presented. Experiments were carried out on a 3m long barrier made of fine sand with an initial front and lee slopes of 1:5; 0.25m high at the centre, in a water depth of 0.5m. Wave heights and flow velocities were measured during each test of one hour duration under regular waves (case-1: wave height H=10cm, wave period T=1s; case-2: H=14cm, T=1.5s) and currents (discharge Q=10, -10, 20, -20, 25 and -25 l/s) with different combinations. In case 1, sediment transport direction is against current irrespective of the current strength. The trend in sediment transport direction can be seen clearly for case 1. In contrast, the direction of sediment transport in case 2 is not clear except for the combination of wave and following current Q=25l/s, where the sediment transport direction is in the direction of wave and current. The observed velocity at the centre of the barrier was analysed and used as an input to different sediment transport models: the Diffusion model, the Heuristic model and the Grab and dump model of Nielsen (1988), as well as the model of Ribberink and Al- alem (1994). Results show that none of the models are suitable for this experiment, although the Ribberink and Al-Salem (1994) formula gives least error.n" @default.
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- W65780487 date "2012-01-01" @default.
- W65780487 modified "2023-09-22" @default.
- W65780487 title "Sand barrier dynamics by waves and currents" @default.
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