Wave flume

About: Wave flume is a research topic. Over the lifetime, 1627 publications have been published within this topic receiving 23335 citations.

Cross-Shore Sediment Transport Modelling and Comparison with Tests at Prototype Scale

Abstract: A series of prototype scale laboratory experiments have been performed at the Large Wave Channel (GWK) in Hanover to investigate the process of sediment transport over a horizontal bed induced by unbroken waves. The selected monochromatic wave heights ranged from 0.25 m to 1.7 m and wave periods from 3 s to 9 s were considered, the water depth was 4.5 m. Flow velocity and sediment concentration measurements were made at several elevations above the bed. A simple sediment trap was also deployed to obtain a Lagrangian estimate of the sediment transport rate. In this paper, the results of the experiment are compared to the predictions from a numerical model for sediment transport based on the time-averaged Energetics approach. Predictions of the orbital velocity, the mean flow velocity, the bedform and the sediment transport rate are compared to the measured values. The time-averaged approach to sediment transport modelling provides an adequate representation of the process for those wave conditions when most sediment is transported.

Solitary wave propagation influenced by submerged breakwater

Abstract: The form of Boussinesq equation derived by Nwogu (1993) using velocity at an arbitrary distance and surface elevation as variables is used to simulate wave surface elevation changes In the numerical experiment, water depth was divided into five layers with six layer interfaces to simulate velocity at each layer interface Besides, a physical experiment was carried out to validate numerical model and study solitary wave propagation “Water column collapsing” method (WCCM) was used to generate solitary wave A series of wave gauges around an impervious breakwater were set-up in the flume to measure the solitary wave shoaling, run-up, and breaking processes The results show that the measured data and simulated data are in good agreement Moreover, simulated and measured surface elevations were analyzed by the wavelet transform method It shows that different wave frequencies stratified in the wavelet amplitude spectrum Finally, horizontal and vertical velocities of each layer interface were analyzed in the process of solitary wave propagation through submerged breakwater

Laboratory Experiments on the Erosion of Clay

Abstract: Results showed that the existing model on erosion of clay with water-filled cracks (Fuhrboter’s theory) which only considers cohesion as the soil strength is only applicable for certain conditions. The model should consider other resistant forces such as soil weight and pore pressures. From the tests on clay without water-filled cracks, it concludes with the limitation of recommended water contents which shows the most erosion resistant behaviour. This new limitation covers both operational and functional aspects which has narrower range than previously reported. Other approaches involving theoretical and operational aspects were also discussed to describe the erosion mechanism and to develop a methodology for further research and development. Other experiments to investigate the possibility of dike breaching initiated by breaking wave impacts have been carried out using small wave flume. A dike model built from sand as core and clay as its cover was subjected by the wave impacts generated by the flume. This qualitative experiment was intended to investigate the mechanism of clay cover failure and breaching possibility initiated by the breaking wave impacts. Seven stages of dike failure mechanisms initiated by breaking wave impacts are identified that lead to severe damage of the sea dike.