The method of empirical orthogonal functions (EOFs) is used to model vertical velocity profiles of the current. The whole current field is decomposed into time series of along and cross-slope velocity components. These time series are then filtered keeping only the frequency bands corresponding to the most significant peaks of the current power density spectra, which in most cases correspond to the main semidiurnal and long period tidal components. New time series are originated containing only filtered current. For each one of these filtered time-series, EOFs and the respective principal components are then derived. The derivation of empirical orthogonal functions make possible the separation of the local flow variability into a few modes of variance. In a general way, the along-slope flow may be described mainly as barotropic, although the baroclinic contribution tends to reach some significance in the flow crossing the shelf slope.

1.
Boyd
,
J. D.
,
Kennely
,
E. P.
, and
Pistek
,
P.
, 1994, “
Estimation of EOF Expansion Coefficients From Incomplete Data
,”
Deep-Sea Res., Part I
0967-0637,
41
(
10
),
1479
1488
.
2.
Sultan
,
S. A. R.
, and
Elghribi
,
N. M.
, 1997, “
EOF analysis of the velocity fields in the Arabian Gulf
,”
Oceanologia Acta
,
21
(
1
),
45
47
.
3.
Forristall
,
G. Z.
, and
Cooper
,
C. K.
, 1997, “
Design Current Profiles Using Empirical Orthogonal Function (EOF) and Inverse FORM Methods
,” OTC 8267.
4.
Jeans
,
G.
,
Grant
,
C.
, and
Feld
,
G.
, 2003, “
Improved Current Profile Criteria for the Deepwater Riser Design
,”
J. Optim. Theory Appl.
0022-3239,
125
,
221
224
.
5.
Pugh
,
D. T.
, 1987, “
Tides, Surges and Mean Sea-Level
,
Wiley
, New York.
6.
Emery
,
W. J.
, and
Thomson
,
R.
, 1998,
Data Analysis Methods in Physical Oceanography
.
1st ed.
,
Pergamon
, New York.
7.
Hamming
,
R. W.
, 1983,
Digital Filters
,
Prentice-Hall Signal Processing Series
,
2nd ed.
, New Jersey.
8.
Preisendorfer
,
R.
, and
Mobley
,
C. D.
, 1988, “
Principal Component Analysis in Meteorology and Oceanography
,” Developments in Atmospheric Science, Vol.
17
.
Elsevier
, Amsterdam.
9.
Kundu
,
P. K.
,
Allen
,
J. S.
, and
Smith
,
R. L.
, 1975, “
Modal decomposition of the velocity field near the Oregon coast
,”
J. Phys. Oceanogr.
0022-3670,
5
(
4
),
683
704
.
10.
Buell
,
C. E.
, 1975, “
The Topography of Empirical Orthogonal Functions
,”
Preprints Fourth Conference on Probability and Statistics in Atmospheric Science
, Tallahassee, FL,
American Meteorology Society
, New York, p.
188
.
11.
Buell
,
C. E.
, 1979, “
On the Physical Interpretation of Empirical Orthogonal Functions
,”
Preprints Sixth Conference on Probability and Statistics in Atmospheric Science
, Banff, Alta.,
American Meteorological Society
, New York, p.
112
.
12.
Richman
,
M. B.
, 1983, “
Specification of Complex Modes of Circulation with T-Mode Factor Analysis
,”
Preprints Second International Conference on Statistics in Climate
, Lisbon, Portugal,
National Institute of Meteorology and Geophysics
, Lisbon, p. 5.1.1.
13.
Peixoto
,
J. P.
, and
Oort
,
A. H.
, 1992,
Physics of Climate
,
American Institute of Physics
, New York.
You do not currently have access to this content.