TY - GEN
T1 - Characteristic shoreline change patterns identified using EOF analysis
AU - Herrington, Thomas O.
AU - Miller, Jon K.
AU - Dean, Robert G.
PY - 2007
Y1 - 2007
N2 - The method of empirical orthogonal functions (EOF) or principal component analysis (PCA) is used to investigate the spatial and temporal variability of shoreline data sets from Duck, North Carolina, the Gold Coast, Australia, and the United States Pacific Northwest. The majority of the variability at each site (nearly 95%) is represented by the first four eigenfunctions, which generally highlight the influence of shore-perpendicular features on the nearshore morphology. Interesting, longshore periodic features, perhaps related to the presence of sand waves, are identified at both Duck and the Gold Coast, while boundary effects related to natural headlands and navigational structures/entrances dominate the longshore variability in the Pacific Northwest. The temporal eigenfunctions associated with these longshore variations are compared with several parameters that are frequently used to characterize the nearshore environment. Correlations are sought between the individual modes of shoreline change and the local conditions. The nearshore parameters considered include the wave energy (E), the cross-shore and longshore wave energy fluxes (Fx and Fy), the wave steepness (Ho/Lo), the non-dimensional fall velocity parameter (Ω), the profile parameter (P), the surf-similarity parameter (ζ), and a surfzone Froude number (Fr). The strongest correlations were obtained between the monthly means of several of the forcing parameters and the temporal coefficients of longshore uniform modes of shoreline change.
AB - The method of empirical orthogonal functions (EOF) or principal component analysis (PCA) is used to investigate the spatial and temporal variability of shoreline data sets from Duck, North Carolina, the Gold Coast, Australia, and the United States Pacific Northwest. The majority of the variability at each site (nearly 95%) is represented by the first four eigenfunctions, which generally highlight the influence of shore-perpendicular features on the nearshore morphology. Interesting, longshore periodic features, perhaps related to the presence of sand waves, are identified at both Duck and the Gold Coast, while boundary effects related to natural headlands and navigational structures/entrances dominate the longshore variability in the Pacific Northwest. The temporal eigenfunctions associated with these longshore variations are compared with several parameters that are frequently used to characterize the nearshore environment. Correlations are sought between the individual modes of shoreline change and the local conditions. The nearshore parameters considered include the wave energy (E), the cross-shore and longshore wave energy fluxes (Fx and Fy), the wave steepness (Ho/Lo), the non-dimensional fall velocity parameter (Ω), the profile parameter (P), the surf-similarity parameter (ζ), and a surfzone Froude number (Fr). The strongest correlations were obtained between the monthly means of several of the forcing parameters and the temporal coefficients of longshore uniform modes of shoreline change.
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U2 - 10.1142/9789812709554_0296
DO - 10.1142/9789812709554_0296
M3 - Conference contribution
AN - SCOPUS:84873044533
SN - 9789812706362
T3 - Proceedings of the Coastal Engineering Conference
SP - 3516
EP - 3528
BT - Proceedings of the 30th International Conference on Coastal Engineering 2006, ICCE 2006
T2 - 30th International Conference on Coastal Engineering, ICCE 2006
Y2 - 3 September 2006 through 8 September 2006
ER -