Wave flume

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

Sheetflow Sediment Transport Modeling: Including Boundary Layer Streaming

Abstract: A two-phase sheetflow sediment transport model is extended to account for boundary layer streaming due to the horizontal non-uniformity present in real-world progressive waves. The model predictions are compared with experimental results obtained in a large-scale wave flume facility (which include boundary layer streaming) and with results from wave tunnel facilities (which do not include boundary layer streaming). The experimental and modeling results both highlight the importance of boundary layer streaming for real-world sediment transport modeling.

Evaluation of using a CCD camera as a versatile measurement system for flume tank observation

Abstract: A plane-based camera calibration method which substantially reduces the complexity of the procedure is presented in this paper With the proposed method, camera array can be installed as a basic facility for wave flume tank experiment Wave flume tank experiment is a methodology commonly used for ocean engineering research Various parameters, such as wave properties on the surface (height, wave form, average level), current in the water (velocity field, vorticity and particle trace), bottom profile and sub-bottom layer thickness are measured with different apparatuses Still image camera is one of the sensors widely used to extract information, such as waveform, bedform and velocity field (particle image velocimetry) The accuracy of image-based measurements mainly relies on the quality of the camera calibration which is a time-consuming process especially in field work For the phenomena of interest observable on the flume tank window glasses, the features are planar in nature Therefore, the camera calibration can be simplified as a map projection problem such that the time and efforts needed are reduced significantly while maintaining the desired accuracy We studied the performance of the plane-based method by comparing the measurements with the theoretical values of a known curve which mimics a sandslope The robustness of the method is examined by comparing the results acquired under the condition that the camera tripod and the quick-release are dissembled, assembled and repositioned during the experiments According to the error analysis, the measurement can be accurate to less than 1 mm for static feature and 1 to 2 mm for dynamic feature

Flume experiment research on law of wave propagation in reef flat

Abstract: In order to research the propagation of waves on the reef and the wave to the reef edge after crushing and propagation,and to provide the reference basis for the determination of design elements,two wave conditions of the average annual waves and 50 a return period waves were simulated by the flume experiment.The test results indicate that the waves along the propagation direction continue to spread after breaking in the reef near the edge,and achieve the stable state at the surface of reef.The characteristics of the wave propagation show that the reef edge waves are easily broken,and the reef wave attenuates rapidly.The broken wave manifests as the breaking of traveling wave,and the breaker index is less than the waves in the general slope.The ratio(Hb/d) of wave height to water depth is about 0.5,while the ratio on the reef edge may be up to 0.76 with 50 a return periods.

Storm Surge and Wave Loading on Horizontal Superstructures

Abstract: Until recently, few methods existed in the literature for the application of wave loading on horizontal superstructures located in coastal regions. In fact, the U.S. Army Corps of Engineers Coastal Engineering Manual, or CEM (the industry standard for coastal construction), contains no methodologies for calculating loads on horizontal superstructures. Although significant effort has been devoted to the development of predictive equations for wave loads on vertical structures such as piles and seawalls, predictive equations for horizontal superstructures have been limited to offshore platforms in ocean wave conditions. Wave conditions in coastal waters can vary significantly from those in the ocean. Wave periods, and therefore wave lengths, in coastal waters are much shorter. Correspondingly, the ratio of the width of coastal superstructures to the wave length is much greater than those ratios encountered in the offshore environment. Thus, wave-induced water particle velocities and accelerations vary significantly over the width of the structure as compared with offshore structures. This results in corresponding variations in wave forces on the structure. Previous researchers presented a mathematical model applicable to structures in coastal environments. This paper reviews the development of that methodology and presents a case study as well as comparisons with other recently developed methodologies.

Wave Damping and Retardance by Emergent Vegeatation

Abstract: Although in the past great attention has been devoted to coastal stabilization, the effect of aquatic vegetation on wave characteristics (damping and retardance etc) is still not well known. In this context an experimental study was performed in an irregular wave flume to explore the effect of reeds (phragmites australis) on wave damping and retardance. Further for a given vegetated area the effect of wave characteristics (i.e. wave height, wave period and wave steepness) on wave damping and retardance were discussed. Real reeds (phragmites australis) with diameter less than 5 mm were employed throughout the experiments for the emergent case. A dimensionless number was introduced to characterize both the vegetated area magnitude and the effect of the vegetation on wave damping and retardance.