Beach response in front of wave-reflecting structures

Roy C. Seaman*, Tom O'Donoghue

*Corresponding author for this work

Research output: Contribution to journalConference article

4 Citations (Scopus)

Abstract

The results of an experimental study of beach response in front of wave-reflecting structures are presented. The particular beach response problem is the so-called `N-type' response where sand is eroded in the area between the node and antinode and is transported towards the node. The characteristics of the equilibrium beach profile are presented and an equation describing the profile is proposed. The beach response is fundamentally dependent on the interaction between the flow and the ripples superimposed on the larger bedforms. Particle image velocimetry (PIV) has been used to look closely at the ripples and the flow. It is found that the sand transport towards the node results from larger vortex growth on the antinodal side of ripples than on the nodal side caused by the asymmetry in the main flow velocity time history which itself is a result of the superposition of the non-linear incident and reflected waves.

Original languageEnglish
Pages (from-to)2284-2297
Number of pages14
JournalProceedings of the Coastal Engineering Conference
Volume2
Publication statusPublished - 1 Jan 1997
EventProceedings of the 1996 25th International Conference on Coastal Engineering. Part 1 (of 4) - Orlando, FL, USA
Duration: 2 Sep 19966 Sep 1996

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Beaches
Sand
Flow velocity
Velocity measurement
Vortex flow

ASJC Scopus subject areas

  • Ocean Engineering

Cite this

Beach response in front of wave-reflecting structures. / Seaman, Roy C.; O'Donoghue, Tom.

In: Proceedings of the Coastal Engineering Conference, Vol. 2, 01.01.1997, p. 2284-2297.

Research output: Contribution to journalConference article

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AB - The results of an experimental study of beach response in front of wave-reflecting structures are presented. The particular beach response problem is the so-called `N-type' response where sand is eroded in the area between the node and antinode and is transported towards the node. The characteristics of the equilibrium beach profile are presented and an equation describing the profile is proposed. The beach response is fundamentally dependent on the interaction between the flow and the ripples superimposed on the larger bedforms. Particle image velocimetry (PIV) has been used to look closely at the ripples and the flow. It is found that the sand transport towards the node results from larger vortex growth on the antinodal side of ripples than on the nodal side caused by the asymmetry in the main flow velocity time history which itself is a result of the superposition of the non-linear incident and reflected waves.

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