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Title: Pressure induced by the interaction of water waves with nearly equal frequencies and nearly opposite directions
Authors: Pellet, Lauranne 
Christodoulides, Paul 
Donne, Sarah 
Bean, Chris 
Dias, Frédéric 
Keywords: Microseisms;Ocean wave–wave interaction;Pressure
Category: Mechanical Engineering
Field: Engineering and Technology
Issue Date: May-2017
Publisher: Elsevier Ltd
Source: Theoretical and Applied Mechanics Letters, 2017, Volume 7, Issue 3, Pages 138-144
Abstract: We present second-order expressions for the free-surface elevation, velocity potential and pressure resulting from the interaction of surface waves in water of arbitrary depth. When the surface waves have nearly equal frequencies and nearly opposite directions, a second-order pressure can be felt all the way to the sea bottom. There are at least two areas of applications: reflective structures and microseisms. Microseisms generated by water waves in the ocean are small vibrations of the ground resulting from pressure oscillations associated with the coupling of ocean surface gravity waves and the sea floor. They are recorded on land-based seismic stations throughout the world and they are divided into primary and secondary types, as a function of spectral content. Secondary microseisms are generated by the interaction of surface waves with nearly equal frequencies and nearly opposite directions. The efficiency of microseism generation thus depends in part on ocean wave frequency and direction. Based on the second-order expressions for the dynamic pressure, a simple theoretical analysis that quantifies the degree of nearness in amplitude, frequency, and incidence angle, which must be reached to observe the phenomenon, is presented.
ISSN: 20950349
Rights: © 2017 The Authors
Type: Article
Appears in Collections:Άρθρα/Articles

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