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Spectral quantification of nonlinear behaviour of the nearshore seabed and correlations with potential forcings at Duck, N.C., U.S.A

Spectral quantification of nonlinear behaviour of the nearshore seabed and correlations with potential forcings at Duck, N.C., U.S.A
Spectral quantification of nonlinear behaviour of the nearshore seabed and correlations with potential forcings at Duck, N.C., U.S.A
Local bathymetric, quasi-periodic patterns of oscillation are identified from 26 years of monthly profile surveys taken at two shore-perpendicular transects at Duck, North Carolina, USA. The data cover both the swash and surf zones. Singular Spectrum Analysis (SSA) and Multi-channel Singular Spectrum analysis (MSSA) methods are applied, on the shoreface, to three potential forcings: the monthly wave heights, the monthly mean water levels and the large scale atmospheric index known as the North Atlantic Oscillation. The patterns within these forcings are compared to the local bathymetric patterns; it is found that the patterns extracted using SSA and MSSA agree well with previous patterns identified using wavelets and confirm the highly non-stationary behaviour of beach levels at Duck. This is followed by analysis of potential correlations between the local bathymetry (at the two transects) and hydrodynamic and atmospheric patterns. The study is then extended to all measured bathymetric profiles, covering an area of 1100 m (alongshore) by 440 m (cross-shore). MSSA showed no collective inter-annual patterns of oscillations present in the bathymetry and the three potential forcings. Annual and semi-annual cycles within the bathymetry are found to be strongly correlated with the monthly wave height, in agreement with the SSA findings. Other collective intra-annual cycles besides the semi-annual were identified; they were all correlated with the North Atlantic Oscillation
1932-6203
1-16
Magar, Vanesa
67f6f0a4-3696-477f-9fae-f00b2b9da0dd
Lefranc, Marc
70d5c6b6-4622-453c-9176-a98c49497372
Hoyle, Rebecca B.
e980d6a8-b750-491b-be13-84d695f8b8a1
Reeve, Dominic E.
e278f093-b56c-430b-a058-660aa4eabcbc
Magar, Vanesa
67f6f0a4-3696-477f-9fae-f00b2b9da0dd
Lefranc, Marc
70d5c6b6-4622-453c-9176-a98c49497372
Hoyle, Rebecca B.
e980d6a8-b750-491b-be13-84d695f8b8a1
Reeve, Dominic E.
e278f093-b56c-430b-a058-660aa4eabcbc

Magar, Vanesa, Lefranc, Marc, Hoyle, Rebecca B. and Reeve, Dominic E. (2012) Spectral quantification of nonlinear behaviour of the nearshore seabed and correlations with potential forcings at Duck, N.C., U.S.A. PLoS ONE, 7 (6), 1-16. (doi:10.1371/journal.pone.0039196).

Record type: Article

Abstract

Local bathymetric, quasi-periodic patterns of oscillation are identified from 26 years of monthly profile surveys taken at two shore-perpendicular transects at Duck, North Carolina, USA. The data cover both the swash and surf zones. Singular Spectrum Analysis (SSA) and Multi-channel Singular Spectrum analysis (MSSA) methods are applied, on the shoreface, to three potential forcings: the monthly wave heights, the monthly mean water levels and the large scale atmospheric index known as the North Atlantic Oscillation. The patterns within these forcings are compared to the local bathymetric patterns; it is found that the patterns extracted using SSA and MSSA agree well with previous patterns identified using wavelets and confirm the highly non-stationary behaviour of beach levels at Duck. This is followed by analysis of potential correlations between the local bathymetry (at the two transects) and hydrodynamic and atmospheric patterns. The study is then extended to all measured bathymetric profiles, covering an area of 1100 m (alongshore) by 440 m (cross-shore). MSSA showed no collective inter-annual patterns of oscillations present in the bathymetry and the three potential forcings. Annual and semi-annual cycles within the bathymetry are found to be strongly correlated with the monthly wave height, in agreement with the SSA findings. Other collective intra-annual cycles besides the semi-annual were identified; they were all correlated with the North Atlantic Oscillation

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Accepted/In Press date: 21 May 2012
Published date: 26 June 2012
Organisations: Mathematical Sciences

Identifiers

Local EPrints ID: 380228
URI: http://eprints.soton.ac.uk/id/eprint/380228
ISSN: 1932-6203
PURE UUID: 2c367b46-5fdf-4cf5-bda9-d066feb4d8a3
ORCID for Rebecca B. Hoyle: ORCID iD orcid.org/0000-0002-1645-1071

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Date deposited: 10 Aug 2015 10:31
Last modified: 15 Mar 2024 03:36

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Contributors

Author: Vanesa Magar
Author: Marc Lefranc
Author: Dominic E. Reeve

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