Wave flume

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

Experimental Assessment of Sediment Transport and Bed formation of Sandy Beaches by Tsunami Waves

Abstract: All experiments in this study were carried out in a flume which was located in the hydraulic laboratory of technical faculty in Guilan University. The wave flume was 12 m long, 0.5 m wide, 0.5 m high and equipped with a wave-producing system and ultrasonic sensors. The objectives of current experimental study are to investigate sediment transport, bed formation and sustainability of sandy beaches with different grain size under tsunami attack. Sediment transport, caused by tsunamis, brings about severe damages to human beings, structures, beach topography and environment. Due to the devastating, destructive and scouring effect of tsunami waves, assessing their operation is of great importance. Experimental studies can be significantly helpful to evaluate the process of transported sediment by a tsunami. Three traps were employed to examine sediment transport in different parts of the beach. The achieved results indicated that wave breaking point has significant effect on the beach profile deformation and sustainability. Furthermore, grains with varying sizes, in the same conditions behave differently. As a result, for finer grains wave backwash has more effects on the sediment transport, while for coarser grains the wave itself has a main role in sediment transport.

Wind/swell seas and steep approach slopes - technical report on wave flume studies

Abstract: HR Wallingford was commissioned by the Ministry of Agriculture, Fisheries and Food to conduct a number of different research projects making use of similar physical model facilities. The projects were combined into a rolling programme of work using the Absorbing Wave Flume at HR Wallingford. The three principle projects were: (i) To study the effects of combined swell/storm (bi-modal) waves on wave overtopping on simple seawall structures (Sub-commission No. FD0202); (ii) To investigate the cross-shore response of shingle beaches to bi-modal and wind sea waves (Sub-commission No. FD0705); (iii} To study the importance of approach slope on the form of breaking waves and the subsequent effects on wave pressures on simple seawall structures (Sub-commission No. FD0201 ). Information obtained during the execution of these projects was also used to validate a nonlinear, surf-zone numerical model developed for MAFF under a separate commission (Subcommission No. FD0204), and to provide data to a European Union PROVERBS project relating to wave loading on vertical structures. This Technical Report documents the methods and results obtained from all of the studies within the rolling programme. Detailed discussions and conclusions drawn from the projects are presented in separate HR Wallingford reports.

Physical Model of Natural Coastal Protection System: Wave Transmission Over Mangrove Seedling Trees

Abstract: Yuanita, N.; Kurniawan, A.; Setiawan, H.; Hasan, F., and Khasanah, M., 2019. Physical model of natural coastal protection system: Wave transmission over mangrove seedling trees. In: Lee, J.L.; Yoon, J.-S.; Cho, W.C.; Muin, M., and Lee, J. (eds.), The 3rd International Water Safety Symposium. Journal of Coastal Research, Special Issue No. 91, pp. 176-180. Coconut Creek (Florida), ISSN 0749-0208.Erosion is one of main problem in coastal area. In order to solve erosion problem, currently natural coastal protection using vegetation such as mangrove is preferable in many places in the world. However, there are challenges in development of this natural coastal protection, e.g. mangrove-seedling-trees have been damaged by the waves or current, before they are growth strongly which required at least 2 years of plantation. To solve this problem, a natural coastal protection system consists of combination of main natural protection and temporary manmade structures is proposed. The study aimed to quantify the wave height reduction with various mangrove densities as well as the influence of mangrove seedling trees arrangements on wave reduction. The laboratory experiments were conducted in a narrow wave flume using model of mangrove as main natural protection and geotextile-geobag models as temporary manmade structure. Various wave conditions were generated during this laboratory test. This paper focus on the experiment results of wave transmission over mangrove seedling trees in order to determine the most effective configuration of mangrove trees plantation against wave. The results showed that the wave height reduction in area with mangroves was about two times larger compared to that in bare land. The wave reduction difference between tandem and staggered arrangements of trees was less than 20 %. It is also found that the temporary structure is significantly reduce wave height and protect mangrove seeds grow from waves attack.

Sand transport process measurements under large-scale braking waves

Abstract: The effects of wave breaking on sediment transport are studied through a new series of mobile-bed experiments in a large-scale wave flume. During the campaign, one experiment involving detailed sand transport process measurements was repeated at 12 different cross-shore location. This procedure allows studying of the cross-shore variation of sand transport processes along the breaking zone. Starting from an initially 1:10 slope followed by a horizontal test section, a breaker bar developed in the breaking region as a result of onshore transport pre-breaking and offshore transport post-breaking. Near-bed suspended sediment fluxes were directed offshore along the complete test section, suggesting that the onshore transport pre-breaking is mainly attributed to bedload. The offshore suspended flux was the sum of an onshore wave-driven component and an offshore current-driven component. The wave-driven contribution to total suspended transport rates seems significant mainly before the breaking point where they account for ~30% of total suspended transport fluxes.