FN Archimer Export Format
PT J
TI Modélisation stochastique des variations à court terme du niveau d'eau dans l'estuaire du Saint-Laurent, Canada
OT Stochastic modelling of short term variations of sea level in the St. Lawrence estuary, Canada
BT 
AF HILMI, K
   CHANUT, JP
   ELSABH, M
AS 1:;2:;3:;
FF 1:;2:;3:;
IF 0.662
TC 0
UR https://archimer.ifremer.fr/doc/00093/20455/18127.pdf
LA French
DT Article
DE ;sea level variations;meteorology;hydrology;ARMA model;St. Lawrence estuary
AB Hourly sea level records taken at Quebec-Lauzon in the St. Lawrence estuary, Canada, are analysed both in frequency domain from 1970 to 1979 and time domain during 1973. Periodic variations, identified by spectral analysis and adjusted by harmonic regression, explain 90 to 95% of the total sea level variability. The residual (non tidal) variations of sea level, stochastic in nature, are responsible of great amplitudes of seiches and storm surges. Such series, representing less than 10%, is tested for its stationnarity and randomness and fitted by AutoRegressive-MovingAverage (ARMA) model. The long-period variations (2 to 28 days) correspond to atmospheric pressure and winds. The short-period variations (2 hours to 1 day) call be attributed to seich-like motions, semidiurnal and diurnal atmospheric tides and inertial oscillations. River discharge, atmospheric pressure and winds contributed 29%, 8.1% and 8.9% respectively to the monthly residual sea level variations. The longitudinal component of sea surface wind (U), parallel to the coast, acts more on residual sea level than the transversal component (V), Perpendicular to the shore, and contributes about 7%. The relationship between residual sea level and atmospheric pressure field is estimated as -1.5 cm.(hPa)(-1) (+/- 0.3 cm.(hPa)(-1)).
PY 1997
SO Oceanologica Acta
SN 0399-1784
PU Gauthier-Villars
VL 20
IS 2
UT A1997XC24200001
BP 333
EP 348
ID 20455
ER

EF