Experimental Investigation on Solitary Wave Interaction With Vertical Porous Barriers

2020 ◽  
Vol 142 (4) ◽  
Author(s):  
Vivek Francis ◽  
Balaji Ramakrishnan ◽  
Murray Rudman
Keyword(s):  
Energy Dissipation ◽  
Solitary Wave ◽  
Solitary Waves ◽  
Wave Interaction ◽  
Coastal Protection ◽  
Tsunami Waves ◽  
Porous Barrier ◽  
Porous Barriers ◽  
Run Up ◽  
Solitary Wave Interaction

Abstract Tsunami waves pose a threat to the coastal zone, and numerous studies have been carried out in the past to understand them. Solitary waves have been extensively used in research because they approximate certain important characteristics of tsunami waves. The present study focusses on the interaction and run-up of solitary waves on coastal protection structures in the form of thin, rigid vertical porous barriers with special attention given to the degree of energy dissipation. To understand the physics of energy dissipation, solitary wave interaction with a porous barrier has been studied from the viewpoint of energy balance. Based on this, a relationship for the wave energy dissipation has been developed. The experimental data show that the plate porosity that gives the optimal energy dissipation lies within the 10–20% range. From the experiments, the phase shift that the solitary wave undergoes upon interaction with the porous barrier models has also been recorded. In addition, a formula is proposed for maximum wave run-up on the porous barrier, which should be useful in the planning, design, construction, and maintenance of coastal protection structures.

Solitary Wave Interaction With Vertical Porous Barriers

2019 ◽  
Author(s):  
Vivek Francis ◽  
Balaji Ramakrishnan ◽  
Murray Rudman
Keyword(s):  
Experimental Data ◽  
Energy Dissipation ◽  
Solitary Wave ◽  
Coastal Protection ◽  
Ocean Engineering ◽  
Tsunami Waves ◽  
Porous Barrier ◽  
Porous Barriers ◽  
Run Up ◽  
Protection Structures

Abstract Tsunami waves pose a threat to the coastal zone and numerous studies have been carried out in the past to understand them. The present study — carried out in the 2D wave flume at the Ocean Engineering Laboratory of IIT Bombay — focusses on the interaction and run-up of solitary waves on coastal protection structures in the form of thin, rigid vertical porous barriers with special attention given to the degree of energy dissipation. In order to understand the physics of the energy dissipation problem, the propagation of the solitary wave and its interaction with the porous barrier has been studied from the viewpoint of energy balance. Based on this, a proper relationship for the wave energy dissipated by the barrier has been developed. Using this relationship, the experimental data has been analyzed and we have determined that the plate porosity that gives the optimal energy dissipation characteristics lies within the 10–20% range. In addition, using the experimental data, we have derived a formula for calculating the maximum wave run-up on the porous barrier models which should be useful in the planning, design, construction and maintenance of coastal protection structures.

scholarly journals Dispersive mudslide-induced tsunamis

1998 ◽  
Vol 5 (3) ◽  
pp. 127-136 ◽  
Author(s):  
A. Rubino ◽  
S. Pierini ◽  
J. O. Backhaus
Keyword(s):  
Solitary Waves ◽  
Intermediate Phase ◽  
Water Model ◽  
Tsunami Propagation ◽  
Tsunami Waves ◽  
Open Sea ◽  
Petviashvili Equation ◽  
Wave Forms ◽  
Generation Region ◽  
Run Up

Abstract. A nonlinear nested model for mudslide-induced tsunamis is proposed in which three phases of the life of the wave, i.e. the generation, far-field propagation and costal run-up are described by means of different mathematical models, that are coupled through appropriate matching procedures. The generation and run-up dynamics are simulated through a nonlinear shallow-water model with movable lateral boundaries: in the generation region two active layers are present, the lower one describing the slide descending on a sloping topography. For the intermediate phase, representing wave propagation far from the generation region, the hydrostatic assumption is not assumed as appropriate in general and, therefore, a nonlinear model allowing for weak phase dispersion, namely a Kadomtsev-Petviashvili equation, is used. This choice is made in order to assess the relevance of dispersive features such as solitary waves and dispersive tails. It is shown that in some realistic circumstances dispersive mudslide-induced tsunami waves can be produced over relatively short, distances. In such cases the use of a hydrostatic model throughout the whole tsunami history turns out to give erroneous results. In particular, when solitary waves are generated during the tsunami propagation in the open sea, the resulting run-up process yields peculiar wave forms leading to amplified coastal inundations with respect to a mere hydrostatic context.

scholarly journals Internal breather-like wave generation by the second mode solitary wave interaction with a step

2016 ◽  
Vol 28 (11) ◽  
pp. 116602 ◽  
Author(s):  
Kateryna Terletska ◽  
Kyung Tae Jung ◽  
Tatiana Talipova ◽  
Vladimir Maderich ◽  
Igor Brovchenko ◽  
...  
Keyword(s):  
Solitary Wave ◽  
Wave Interaction ◽  
Wave Generation ◽  
Second Mode ◽  
Solitary Wave Interaction

scholarly journals Experimental evidence of solitary wave interaction in Hertzian chains

2011 ◽  
Vol 84 (2) ◽  
Author(s):  
Francisco Santibanez ◽  
Romina Munoz ◽  
Aude Caussarieu ◽  
Stéphane Job ◽  
Francisco Melo
Keyword(s):  
Solitary Wave ◽  
Experimental Evidence ◽  
Wave Interaction ◽  
Solitary Wave Interaction

LARGE SCALE EXPERIMENTS ON EVOLUTION AND RUN-UP OF BREAKING SOLITARY WAVES

2007 ◽  
Vol 01 (03) ◽  
pp. 257-272 ◽  
Author(s):  
KAO-SHU HWANG ◽  
YU-HSUAN CHANG ◽  
HWUNG-HWENG HWUNG ◽  
YI-SYUAN LI
Keyword(s):  
Solitary Wave ◽  
Wave Height ◽  
Solitary Waves ◽  
Water Depth ◽  
Large Scale ◽  
Scale Effects ◽  
Wave Heights ◽  
Run Up ◽  
Hydraulics Laboratory ◽  
The Waves

The evolution and run-up of breaking solitary waves on plane beaches are investigated in this paper. A series of large-scale experiments were conducted in the SUPER TANK of Tainan Hydraulics Laboratory with three plane beaches of slope 0.05, 0.025 and 0.017 (1:20, 1:40 and 1:60). Solitary waves of which relative wave heights, H/h0, ranged from 0.03 to 0.31 were generated by two types of wave-board displacement trajectory: the ramp-trajectory and the solitary-wave trajectory proposed by Goring (1979). Experimental results show that under the same relative wave height, the waveforms produced by the two generation procedures becomes noticeably different as the waves propagate prior to the breaking point. Meanwhile, under the same relative wave height, the larger the constant water depth is, the larger the dimensionless run-up heights would be. Scale effects associated with the breaking process are discussed.

The run-up of N -waves on sloping beaches

1994 ◽  
Vol 445 (1923) ◽  
pp. 99-112 ◽  
Keyword(s):  
Solitary Waves ◽  
Wave Model ◽  
Propagation Distance ◽  
Order Theory ◽  
New Paradigm ◽  
Asymptotic Results ◽  
Tsunami Waves ◽  
First Order Theory ◽  
Run Up ◽  
Tsunami Run Up

Anecdotal reports of tsunamis climbing up coastlines have often described the shoreline receding significantly before the tsunami waves run-up on the beach. These waves are caused by tsunamigenic earthquakes close to the shoreline, when the generated wave does not have sufficient propagation distance to evolve into leading-elevation waves or a series of solitary waves. Yet all previous run-up in­vestigations have modelled periodic waves or solitary waves which initially only run-up on the beach. In our studies of these initially receding shorelines, we have found a class of N -shaped waves with very interesting and counterintuitive behaviour which may lead to a new paradigm for the studies of tsunami run-up. We will use a first-order theory and we will derive asymptotic results for the maximum run-up within the validity of the theory for different types of N -waves. We have observed that leading depression N -waves run-up higher than leading elevation N -waves, suggesting that perhaps the solitary wave model may not be adequate for predicting an upper limit for the run-up of near-shore generated tsunamis.

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