scholarly journals PRESSURE UPON VERTICAL WALL PROM STANDING WAVES

1972 ◽  
Vol 1 (13) ◽  
pp. 87
Author(s):  
V.K. Shtencel
Keyword(s):  
Experimental Data ◽  
Standing Wave ◽  
Vertical Wall ◽  
Standing Waves ◽  
Finite Depth ◽  
Theoretical Solution ◽  
Stable Mode ◽  
Wave Pressure ◽  
Additional Criterion ◽  
Structure Result

When surge waves approach a vertical wall a standing wave is formed ahead of the latter. This is the only case when the interaction between waves and structure result in a stable mode of motion with distinct kinematic characteristics. Such motion can be described by equations of hydromechanics without the introduction of any hydraulic coefficients; a comparison of various theoretical solutions with experimental data can serve as an additional criterion for evaluating the accuracy of this or that solution. The first theoretical solution for wave pressure acting upon a vertical wall under the effect of standing waves at a finite depth has been published by Sainflou in 1928 (1).

scholarly journals LIMITING CONDITION FOR STANDING WAVE THEORIES BY PERTURBATION METHOD

1970 ◽  
Vol 1 (12) ◽  
pp. 32 ◽  
Author(s):  
Yoshito Tsuchiya ◽  
Masataka Yamaguchi
Keyword(s):  
Free Surface ◽  
Perturbation Method ◽  
Standing Wave ◽  
Vertical Wall ◽  
Standing Waves ◽  
Finite Amplitude ◽  
Surface Conditions ◽  
Wave Pressure ◽  
Wave Characteristics ◽  
Limiting Condition

The purpose of this paper is to make clear the validity and limiting condition for the application of the finite amplitude standing wave theories by the perturbation method In a numerical example, the errors of each order solution of these theories for two non-linear free surface conditions are computed for various kinds of wave characteristics and compared with each other Some experiments on the wave pressure on a vertical wall by standing waves were carried out and a plot of the limiting condition for the application of these theories is proposed based on the comparison with theoretical curves In addition, as an example of the application of these theories, the change of characteristics of wave pressure of standing waves accompanying the overtopping wave on a vertical wall is discussed.

On the observability of finite-depth short-crested water waves

1996 ◽  
Vol 322 ◽  
pp. 1-19 ◽  
Author(s):  
M. Ioualalen ◽  
A. J. Roberts ◽  
C. Kharif
Keyword(s):  
Standing Wave ◽  
Water Waves ◽  
Numerical Study ◽  
Standing Waves ◽  
Finite Depth ◽  
Two Dimensional ◽  
Wave Fields ◽  
Progressive Waves ◽  
Wave Limit ◽  
Narrow Bands

A numerical study of the superharmonic instabilities of short-crested waves on water of finite depth is performed in order to measure their time scales. It is shown that these superharmonic instabilities can be significant-unlike the deep-water case-in parts of the parameter regime. New resonances associated with the standing wave limit are studied closely. These instabilities ‘contaminate’ most of the parameter space, excluding that near two-dimensional progressive waves; however, they are significant only near the standing wave limit. The main result is that very narrow bands of both short-crested waves ‘close’ to two-dimensional standing waves, and of well developed short-crested waves, perturbed by superharmonic instabilities, are unstable for depths shallower than approximately a non-dimensional depth d= 1; the study is performed down to depth d= 0.5 beyond which the computations do not converge sufficiently. As a corollary, the present study predicts that these very narrow sub-domains of short-crested wave fields will not be observable, although most of the short-crested wave fields will be.

scholarly journals WAVE FORCES AGAINST SEA WALL

1964 ◽  
Vol 1 (9) ◽  
pp. 31 ◽  
Author(s):  
Masashi Hom-ma ◽  
Kiyoshi Horikawa
Keyword(s):  
Experimental Data ◽  
Surf Zone ◽  
Vertical Wall ◽  
Experimental Studies ◽  
Wave Forces ◽  
Wave Pressure ◽  
Scientists And Engineers ◽  
The University ◽  
Sea Wall ◽  
Inclined Surface

The study concerning the wave forces acting on breakwater has been conducted by numerous scientists and engineers both in field and in laboratory,, While few studies have been carried out on the wave forces acting on sea wall which is located inside the surf zone. In this paper are summarized the main results of the experimental studies conducted at the University of Tokyo, Japan, in relation to the subject on the wave forces against a vertical or inclined surface wall located shorewards from the breaking point, and also is proposed an empirical formula of wave pressure distribution on a sea wall on the basis of the experimental data. The computed results obtained by using the above formula are compared with the field data of wave pressure on a vertical wall measured at the Niigata West Coast, Niigata Prefecture, Japan, and also with the experimental data of total wave forces on a vertical wall; the project of the latter is now in progress at the University of Tokyo.

scholarly journals PRESSURE OF WAVES AGAINST VERTICAL WALLS

1970 ◽  
Vol 1 (12) ◽  
pp. 89
Author(s):  
M.E. Plakida
Keyword(s):  
Experimental Data ◽  
Pressure Distribution ◽  
Vertical Wall ◽  
Vertical Plane ◽  
Water Jet ◽  
Breaking Wave ◽  
Wave Pressure ◽  
Method Of Calculation ◽  
Vertical Walls ◽  
The Impact

This paper is concerned with the study of the breaking wave pressure exerted upon the breakwater of the vertical type. The method of calculation of the wave pressure, named the quasistatical method, is based with the theory of the impact of the water jet en the vertical plane and some new results of the experimental data. The formulas for the calculation of the pressure distribution of the breaking wave and the surf wave on the vertical wall are given.

Nonlinear Wave Crest Distribution on a Vertical Breakwater

2018 ◽  
Author(s):  
Valentina Laface ◽  
Giovanni Malara ◽  
Felice Arena ◽  
Ioannis A. Kougioumtzoglou ◽  
Alessandra Romolo
Keyword(s):  
Experimental Data ◽  
Free Surface ◽  
Vertical Wall ◽  
Surface Elevation ◽  
Wave Crest ◽  
Height Distribution ◽  
Free Surface Elevation ◽  
Pressure Transducers ◽  
Pressure Time ◽  
Time Histories

The paper addresses the problem of deriving the nonlinear, up to the second order, crest wave height probability distribution in front of a vertical wall under the assumption of finite spectral bandwidth, finite water depth and long-crested waves. The distribution is derived by relying on the Quasi-Deterministic representation of the free surface elevation in front of the vertical wall. The theoretical results are compared against experimental data obtained by utilizing a compressive sensing algorithm for reconstructing the free surface elevation in front of the wall. The reconstruction is pursued by starting from recorded wave pressure time histories obtained by utilizing a row of pressure transducers located at various levels. The comparison shows that there is an excellent agreement between the proposed distribution and the experimental data and confirm the deviation of the crest height distribution from the Rayleigh one.

scholarly journals Instability of standing waves for non-linear Schrödinger-type equations

1988 ◽  
Vol 8 (8) ◽  
pp. 119-138 ◽  
Keyword(s):  
Dynamical Systems ◽  
Standing Wave ◽  
Optical Waveguides ◽  
Standing Waves ◽  
Positive Eigenvalue ◽  
Shooting Argument ◽  
Wave Solutions ◽  
Non Linear ◽  
Linearized Operator

AbstractA theorem is proved giving a condition under which certain standing wave solutions of non-linear Schrödinger-type equations are linearly unstable. The eigenvalue equations for the linearized operator at the standing wave can be analysed by dynamical systems methods. A positive eigenvalue is then shown to exist by means of a shooting argument in the space of Lagrangian planes. The theorem is applied to a situation arising in optical waveguides.

STEEP STANDING WAVES AGAINST A VERTICAL WALL ON A SLOPING BEACH

2011 ◽  
pp. 1762-1769
Author(s):  
W. KIOKA ◽  
T. KITANO ◽  
M. OKAJIMA ◽  
N. MIYABE
Keyword(s):  
Vertical Wall ◽  
Standing Waves ◽  
Sloping Beach
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