Wave flume

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

Shear Stress Measurements and Erosion Implications for Wave and Combined Wave-Current Generated Flows

Abstract: Sediment transport in wave-dominated environments is of great interest for dredged material placement, contaminated sediments, habitat protection, and other issues. The shear stress at the sediment-water interface during a wave event is an important parameter in determining erosion and transport for both experimental and model simulation applications. Sandia National Laboratories has developed a laboratory and field device called the sediment erosion actuated by wave oscillations and linear flow (SEAWOLF) flume in which high-resolution, particle-image velocimetry (PIV) has been applied to investigate turbulent flow shear stresses for a variety of flow conditions. The results of the PIV analysis for a wave cycle demonstrate a fully developed turbulent flow, relaminarization, and an explosive transition back to turbulence. In many cases, the results of the flume tests did not show good agreement with previously reported computational fluid dynamic results and existing theories, such as Blasius, for ...

Breaking Wave Imaging Using Lidar and Sonar

Abstract: The two-phase flow generated by breaking ocean waves plays a crucial role in various geophysical processes, including dissipation of wave energy and atmospheric gas exchange. This paper presents a technique to measure the two-phase flow generated by breaking waves at prototype scale. We have demonstrated the validity and potential of this technique in the Large Wave Flume (Grosser Wellenkanal, GWK) facility in Hanover, Germany. Actively breaking, depth-limited waves were measured using an array of three downward-looking lidars mounted above the water surface and an upward-looking multibeam sonar below. This novel setup enabled the characterization of the complete upper boundary (free water surface and splash-up) and seaward lower boundary (entrained cavity and bubble plume) of the breaking wave. We have quantified the migration of the lower boundary as the cavity and plume are entrained in the water column—penetrating toward the seabed, moving onshore with the passage of the wave crest, and then rising as it is slowly advected offshore. We have also estimated the overall composition of the splash, cavity, and plume as the breaking wave evolves over time. Our observations are consistent with results from previous small-scale laboratory experiments and the suitability of the technique for experimentation at prototype scale has been demonstrated.

The interaction between a vertical cylinder and regular waves

Abstract: The huge amount of offshore activities in recent years has increased the need of reliable data concerning the wave loading on vertical cylinders. A review is given of different methods, according to which the wave forces on a vertical circular cylinder can be calculated. Numerical results of these methods are compared with the results of model experiments. The wave diffraction around a cylindrical object was calculated with the potential theory and is compared with measurements of the wave amplitude.

Prediction of bed ripple geometry under controlled wave conditions: wave-flume experiments and MIKE21 numerical simulations

Abstract: Introduction Ripples are the most common bed forms and are the focus of this research. Ripples form in many different environments and have a variety of characteristics. The bed form type depends on the strength and nature of the flow. A steady current, tidal current, waves, or a combination of all three will influence the size, shape, and orientation of the bed forms. The nonlinear complexities of the flow present challenges in predicting ripples, and much research has been done examining bed forms under different flow regimes (e.g., Bagnolds,1946 ; Sleath,1984 ; Wiberg and Harris,1994 ; Nielsen,1992 ).