scholarly journals Water wave transmission and energy dissipation by a floating plate in the presence of overwash

2020 ◽  
Vol 889 ◽  
Author(s):  
Filippo Nelli ◽  
Luke G. Bennetts ◽  
David M. Skene ◽  
Alessandro Toffoli
Keyword(s):  
Energy Dissipation ◽  
Water Wave ◽  
Wave Transmission ◽  
Floating Plate ◽  
Image Position

scholarly journals Wave Interaction with Single and Twin Vertical and Sloped Slotted Walls

2020 ◽  
Vol 8 (8) ◽  
pp. 589
Author(s):  
Mohamad Alkhalidi ◽  
Noor Alanjari ◽  
S. Neelamani
Keyword(s):  
Energy Dissipation ◽  
Transmission Coefficient ◽  
Wave Height ◽  
Wave Reflection ◽  
Wave Length ◽  
Wave Interaction ◽  
Wave Transmission ◽  
Random Wave ◽  
Dissipation Coefficient ◽  
Energy Dissipation Coefficient

The interaction between waves and slotted vertical walls was experimentally studied in this research to examine the performance of the structure in terms of wave transmission, reflection, and energy dissipation. Single and twin slotted barriers of different slopes and porosities were tested under random wave conditions. A parametric analysis was performed to understand the effect of wall porosity and slope, the number of walls, and the incoming relative wave height and period on the structure performance. The main focus of the study was on wave transmission, which is the main parameter required for coastal engineering applications. The results show that reducing wall porosity from 30% to 10% decreases the wave transmission by a maximum of 35.38% and 38.86% for single and twin walls, respectively, increases the wave reflection up to 47.6%, and increases the energy dissipation by up to 23.7% on average for single walls. For twin-walls, the reduction in wall porosity decreases the wave transmission up to 26.3%, increases the wave reflection up to 40.5%, and the energy dissipation by 13.3%. The addition of a second wall is more efficient in reducing the transmission coefficient than the other wall parameters. The reflection and the energy dissipation coefficients are more affected by the wall porosity than the wall slope or the existence of a second wall. The results show that as the relative wave height increases from 0.1284 to 0.2593, the transmission coefficient decreases by 21.2%, the reflection coefficient decreases by 15.5%, and the energy dissipation coefficient increases by 18.4% on average. Both the transmission and the reflection coefficients increase as the relative wave length increases while the energy dissipation coefficient decreases. The variation in the three coefficients is more significant in deep water than in shallower water.

scholarly journals Water wave transmission by an array of floating discs

2015 ◽  
Vol 471 (2173) ◽  
pp. 20140698 ◽  
Author(s):  
L. G. Bennetts ◽  
T. D. Williams
Keyword(s):  
Wave Energy ◽  
Water Wave ◽  
Theoretical Models ◽  
Wave Transmission ◽  
High Concentration ◽  
Low Concentration ◽  
Wave Basin ◽  
Model Predictions ◽  
Rigid Body Motions ◽  
Incident Wave Energy

An experimental validation of theoretical models of regular-water-wave transmission through arrays of floating discs is presented. The experiments were conducted in a wave basin. The models are based on combined potential-flow and thin-plate theories, and the assumption of linear motions. A low-concentration array, in which discs are separated by approximately a disc diameter in equilibrium, and a high-concentration array, in which adjacent discs are almost touching in equilibrium, were used for the experiments. The proportion of incident-wave energy transmitted by the discs is presented as a function of wave period, and for different wave amplitudes. Results indicate the models predict wave-energy transmission accurately for small-amplitude waves and low-concentration arrays. Discrepancies for large-amplitude waves and high-concentration arrays are attributed to wave overwash of the discs and collisions between discs. Validation of model predictions of a solitary disc's rigid-body motions are also presented.

Transmission of water waves through small apertures

1972 ◽  
Vol 55 (1) ◽  
pp. 149-161 ◽  
Author(s):  
D. C. Guiney ◽  
B. J. Noye ◽  
E. O. Tuck
Keyword(s):  
Shallow Water ◽  
Transmission Coefficient ◽  
Water Waves ◽  
Water Wave ◽  
Wave Transmission ◽  
Exact Theory ◽  
Vertical Barrier ◽  
Wave Transmission Coefficient

The water-wave transmission coefficient for a small slit in a thick vertical barrier is obtained theoretically and verified both experimentally and by comparison with an exact theory for the case of zero thickness. Similar shallow-water results are presented.

Assessment of random wave energy dissipation due to submerged aquatic plants in shallow water using deep water wave conditions

2021 ◽  
pp. 147509022110399
Author(s):  
Dag Myrhaug ◽  
Pierre-Yves Henry
Keyword(s):  
Energy Dissipation ◽  
Shallow Water ◽  
Deep Water ◽  
Aquatic Plants ◽  
Wave Energy ◽  
Water Wave ◽  
Random Wave ◽  
Wave Energy Dissipation ◽  
Submerged Aquatic Plants ◽  
Deep Water Wave

This article addresses the random wave energy dissipation due to submerged aquatic plants in shallow water based on deep water wave conditions including estimation of wave damping. The motivation is to provide a simple engineering tool suitable to use when assessing random wave damping due to small patches of plants in shallow water. Examples of application for typical field conditions are provided. The present method versus common practice is discussed. A possible application of the outcome of this study is that it can be used as a parameterization of wave energy dissipation due to vegetation patches of limited size in operational estuarine and coastal circulation models.

Scaling of the turbulent energy dissipation correlation function

2020 ◽  
Vol 891 ◽  
Author(s):  
S. L. Tang ◽  
R. A. Antonia ◽  
L. Djenidi ◽  
Y. Zhou
Keyword(s):  
Correlation Function ◽  
Energy Dissipation ◽  
Turbulent Energy ◽  
Image Position

Wave Transmission, Reflection and Energy Dissipation Characteristics of Floating and Fixed Pontoon Type Wave Barriers in Random Wave Fields

2014 ◽  
Author(s):  
Neelamani Subramaniam ◽  
K. Al-Banaa
Keyword(s):  
Energy Dissipation ◽  
Water Depth ◽  
Incident Wave ◽  
Wave Transmission ◽  
Random Wave ◽  
Relative Width ◽  
Transmission Coefficients ◽  
Type Wave ◽  
Short Period ◽  
Wide Range

Wave transmission, reflection and dissipation characteristics of floating and partially immersed fixed pontoon-type barriers dictate its optimal design. Model scaled experimental investigations were carried out on two different types of wave barriers; one, a floating slack moored pontoon barrier and another, a fixed partially immersed pontoon barrier. The hydrodynamic performances for a wide range of random wave conditions are assessed. The draft of both the pontoon models is kept constant with 12.66% of water depth. JONSWAP spectra was used for random wave generation. The investigations were carried out for incident wave steepness, His/Lp in the range of 0.007 to 0.097, relative water depth, d/Lp in the range of 0.093 to 0.452 and relative width of the breakwater, B/Lp in the range of 0.133 to 0.646. It was found from this study that increasing the relative width of the wave barrier could reduce the wave transmission coefficients and increase the wave reflection and energy dissipation coefficients for both the types of wave barriers. For floating barrier, for short period waves (B/Lp of 0.5 to 0.6), the transmission coefficients were in the range of 0.25 to 0.3 and for long period waves (B/Lp of 0.13 to 0.2), the transmission coefficients were in the range of 0.8 to 0.85. Fixing the barrier in space help to reduce the wave transmission to an extent of 10% to 15%, especially for the long waves. For d/Lp in the range of 0.093 to 0.452, for fixed barrier, the reflection coefficients were in the range of 0.6 to 0.8; whereas for floating barrier, it was only in the range of 0.3 to 0.6. It was found that the wave energy dissipation coefficient is better for floating barrier (0.4 to 0.8) compared to fixed barrier (0.2 to 0.5). For a design wave length of 40 m, in order to reduce 50%, 60%, and 70% of the incident wave height on the lee side, a floating pontoon barrier with width of 17.2 m, 21.6 m and 26.0 m respectively would be needed. For the same condition, barrier widths of 12.4 m, 18.8 m, and 26.0 m would be needed for a partially immersed fixed barrier with a draft of 12.66% of water depth. The data from this study will be useful for the design of floating, as well as partially immersed fixed pontoon type wave barriers.

scholarly journals To study impact level of dominat parameters and propose estimate methodology for wave transmission efficiency of unconventional complex pile submerged breakwater

2020 ◽  
Vol 19 (4) ◽  
pp. 611-625
Author(s):  
Nguyen Anh Tien
Keyword(s):  
Energy Dissipation ◽  
Wave Energy ◽  
Complex Structure ◽  
Transmission Efficiency ◽  
Wave Transmission ◽  
Random Wave ◽  
Submerged Breakwater ◽  
Dissipation Process ◽  
Wave Energy Dissipation ◽  
Major Factors

This article proposes semi-empirical equations to estimate wave transmission coefficient through submerged complex with solid pile breakwater based on theories of random wave energy conservation of perpendicular wave transmission incorporated with physical hydraulic experiments in wave flume applied on both types of submerged breakwater with and without piles. These equations are able to describe interactions and energy dissipation process for each element of this complex structure which are foundation block and pile rows. Energy dissipation process depends on three major factors which are [relative submerge depth (Rc/Hm0), relative crest width (B/Hm0), wave slope at construction location (sm=Hm0/Lm)] and wave energy dissipation process through pile rows is determined by two major factors [relative submerged depth or submerged length of piles (Rc/Hm0), relative pile row width (Xb/Lm)].

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