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Wave flume

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


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01 Jan 1994
TL;DR: In this article, the water table over-height due to pure wave forcing without tidal effect is investigated through laboratory experiments with regular waves in a wave flume, and different beach materials with different permeabilities are considered.
Abstract: Wave run-up beyond the shoreline on a sandy beach causes infiltration and consequently a lifting of the water table. This is a significant factor affecting the coastal groundwater hydrology. The water table over-height due to pure wave forcing without tidal effect is investigated through laboratory experiments with regular waves in a wave flume. Different beach materials with different permeabilities are considered. The asymptotic inland over-height shows strong correlation with the wave run-up height, the combined wave parameter (HoLo)/D which is linked to the run-up height, and the surf similarity parameter. However, the effect of sand sizes, which were tested in this study, on the over-height is little apparent.

2 citations

01 Jan 2012
TL;DR: In this paper, the authors employed two advanced numerical models, SWAN and EBED (modified) model, to determine the sediment transport patterns and their implications for topographic changes due to waves and currents in the Ystad Bay, Skane, Sweden.
Abstract: Coastal areas around the world are being shaped by many natural phenomena, as well as by man-induced activities. Hydrodynamic phenomena such as wind-generated waves, extreme storms and seasonal tides cause a continued change in topography and the natural sediment formation in the nearshore zone as a result of erosion and accumulation. Therefore, the nature of the nearshore zone and its protection through different structures and activities is of great importance for coastal engineers and project managers. In the recent decades, numerical modelling has been an engineering tool for the simulation of waves and sediment transport in coastal waters and bays. Nowadays, there are a number of developed models in terms of simulating nearshore hydrodynamics and sediment transport. The results of these models in practical applications have been validated and shown to be in good agreement with observations. However, due to the complexity of morphological phenomena in coastal waters, especially in the nearshore regions, these models usually deal with some specific processes and are limited by time and space scales. The main objective of this study is employ two advanced numerical models, SWAN and EBED (modified) model to determine the sediment transport patterns and their implications for topographic changes due to waves and currents in the Ystad Bay, Skane, Sweden. This work was performed with emphasis on different time scales and various types of wave conditions. In order to derive a sediment pattern for the Ystad Bay, a preliminary study of the background data for the Ystad Bay was performed. The SWAN and the EBED-modified model were numerically implemented to calculate the wave field in the bay for the wave conditions from 2004 to 2010 for both extreme situations and for long-term representative conditions, and the simulation results were illustrated afterwards. Furthermore, the EBED-modified model was applied to derive two-dimensional current fields. A numerical model developed by Nam (2010) was subsequently implemented to calculate the sediment transport with focus on longshore transport. The simulation results from the application of the numerical models show that waves from south and southwest, which have the long fetches for Ystad Bay, will cause erosion in the western parts of the bay and accretion along the lower southeastern part of the bay. These results are in a good agreement with observations. However, the sediment transport model should be improved to include cross-shore transport in the future.

2 citations

Journal ArticleDOI
TL;DR: In this article, the performance of wide-grained grain materials (0.1-200 mm) as scour protection system tested under spectral wave loads was investigated by the Leibniz University of Hannover, Germany.
Abstract: Large-scale hydraulic model tests were carried out by the Leibniz University of Hannover, Germany to investigate the performance of wide-graded grain materials (0.1-200 mm) as scour protection system tested under spectral wave loads. The model tests were conducted in the Large Wave Flume (GWK) of the Forschungszentrum Kuste (FZK) assuming a length scale of 1:4. The experimental setup consisted of a single layer material bed protecting a monopile (D=1 m) as often used as offshore supporting structure. In order to measure the structure-induced scour development around the monopile acoustic backscatter systems (ABS), single-beam echosounder, and a 3D laser scanner were used. Matching environmental conditions of the North Sea, the model tests were carried out with spectral wave load (JONSWAP-spectra) and successively increasing significant wave heights up to H_s=1.3 m. As result, a maximum scour depth of S/D=0.161 was found after 9000 waves which resembled a synthetic storm duration of 20 h. The results indicate high stability against spectral wave load and demonstrate the capability of wide-graded material to perform reasonably well under wave loads, particularly applied in a dynamic design of scour protection.

2 citations

Journal ArticleDOI
TL;DR: In this paper, the authors developed and checked a new coastal structure, Corrugated Semi-circular Breakwater (CBW), which is modified from the Semi-Circular breakwater (SCBW), one of the hard protections used in Japan and China, to increase its efficiency in coastal protection and electricity generation.
Abstract: The importance of coastal protection increases with the increase in coastal development. Soft and hard protection measures are the most used techniques; however, hard structures are still preferable. Hard structures are characterized by a long lifetime and high stability in rough sea states. Many innovative, environmentally friendly hard coastal protections measured have been proposed and used for specific applications. This research’s main objective is to develop and check a new coastal structure, Corrugated Semi-circular Breakwater (CBW). This structure is modified from the Semi-circular Breakwater (SCBW), one of the hard protections used in Japan and China, to increase its efficiency in coastal protection and electricity generation. A comparative study between CBW and SCBW is carried out physically in a two dimensions wide wave flume with dimensions 1.2*1.2*40 m and numerically using the Flow-3D model. The study checked the effect of the structures in merged, semi-merged, and submerged conditions and increased structure permeability. The reflection, transmission, and dissipation coefficients are used as the efficiency indicators. The results show that CBW is more efficient in wave dissipation, current velocity reductions, and bed stability than SCBW. It is recommended to use the CBW as a submerged protected structure within the recreational coastal areas.

2 citations

Journal ArticleDOI
TL;DR: In this article, a two-dimensional finite element model of the Savonius turbine is established by dynamic mesh technique, and the speed and average power coefficient of different rotor profiles are analyzed by velocity and pressure nephogram.

2 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202331
202284
202165
202069
201964
201859