scholarly journals FERRY WAVE MEASUREMENTS IN DEEP WATER

1986 ◽  
Vol 1 (20) ◽  
pp. 46
Author(s):  
Ronald E. Nece ◽  
Michael R. McCaslin ◽  
Derald R. Christensen ◽  
Harry H. Yeh
Keyword(s):  
Field Test ◽  
Deep Water ◽  
Test Procedures ◽  
Ship Waves ◽  
Wave Measurements ◽  
Vessel Speed

Data are presented for ship waves generated and measured in deep water. Results show the variation of maximum vessel waves with both vessel speed and distance from the vessel sailing line. Three automobile ferries of different configurations were tested. Field test procedures, limitations, and problems are described.

scholarly journals Deep Water Ship-Waves

1906 ◽  
Vol 25 (1) ◽  
pp. 562-587 ◽  
Author(s):  
Lord Kelvin
Keyword(s):  
Deep Water ◽  
Two Dimensions ◽  
Two Dimensional ◽  
Present Communication ◽  
Ship Waves ◽  
Horizontal Bottom

§§ 32–64. Canal Ship-Waves.§ 32. To avoid the somewhat cumbrous title “Two-dimensional,” I now use the designation “Canal † Waves” to denote waves in a canal with horizontal bottom and vertical sides, which, if not two-dimensional in their source, become more and more approximately two-dimensional at greater and greater distances from the source. In the present communication the source is such as to render the motion two-dimensional throughout; the two dimensions being respectively perpendicular to the bottom, and parallel to the length of the canal: the canal being straight.

scholarly journals SHIP-WAVE ATTENUATION TESTS OF A PROTOTYPE FLOATING BREAKWATER

1984 ◽  
Vol 1 (19) ◽  
pp. 168 ◽  
Author(s):  
Ronald E. Nece ◽  
Norman K. Skjelbreia
Keyword(s):  
Field Test ◽  
Wave Attenuation ◽  
Model Tests ◽  
Limited Data ◽  
Test Procedures ◽  
Ship Wave ◽  
Floating Breakwater ◽  
Monochromatic Waves

Limited data are presented for the ship-wave attenuation of a prototype concrete pontoon floating breakwater. Results are compared with wave attenuation performance of a breakwater of identical crosssection and similar anchoring configuration as predicted by model tests using monochromatic waves. Field test procedures and limitations are described.

Nonlinear Fourier Analysis Algorithm and Models for Water Waves in Terms of Surface Elevation, Amplitude Modulations

2019 ◽  
Author(s):  
Alfred R. Osborne
Keyword(s):  
Synthetic Aperture Radar ◽  
Surface Waves ◽  
Shallow Water ◽  
Wave Field ◽  
Deep Water ◽  
Coherent Structures ◽  
Water Waves ◽  
Surface Elevation ◽  
Synthetic Aperture ◽  
Wave Measurements

Abstract This paper addresses two issues with regard to nonlinear ocean waves. (1) The first issue relates to the often-confused differences between the coordinates used for the measurement and characterization of ocean surface waves: The surface elevation and the complex modulation of a wave field. (2) The second issue relates to the very different kinds of physical wave behavior that occur in shallow and deep water. Both issues come from the known, very different behaviors of deep and shallow water waves. In shallow water one often uses the Korteweg-deVries that describes the wave surface elevation in terms of cnoidal waves and solitons. In deep water one uses the nonlinear Schrödinger equation whose solutions correspond to the complex envelope of a wave field that has Stokes wave and breather solutions. Here I make clear the relationships between the two ways of characterizing surface waves. Furthermore, and more importantly, I address the issues of matching the two types of wave behavior as the wave motion passes from deep to shallow water, or vice versa. For wave measurements we normally obtain the surface elevation with a wave staff, resistance gauge or pressure recorder for getting time series. Remote sensing applications relate to the use of lidar, radar or synthetic aperture radar for obtaining space series. The two types of wave behavior can therefore crucially depend on where the instrument is placed on the “ground track” or “field” over which the lidar or radar measurements are made. Thus the matching problem from deep to shallow water is not only important for wave measurements, but also for wave modeling. Modern wave models [Osborne, 2010, 2018, 2019a, 2019b] that maintain the coherent structures of wave dynamics (solitons, Stokes waves, breathers, superbreathers, vortices, etc.) must naturally pass from deep to shallow water where the nature of the nonlinear physics, and the form of the coherent structures, change. I address these issues and more herein. This paper is directed towards the development of methods for the real time measurement of waves by shipboard radar and for wave measurements by airplane and helicopter using lidar and synthetic aperture radar. Wave modeling efforts are also underway.

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