Tidal dynamics of the south-west lagoon of New Caledonia: observations and 2D numerical modelling

被引:46
作者
Douillet, P [1 ]
机构
[1] ORSTOM, Ctr Noumea, Noumea, New Caledonia
关键词
D O I
10.1016/S0399-1784(98)80050-9
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
The purpose of this paper is to determine, with the aid of a two-dimensional model, the depth-averaged tidal stream in the south-west lagoon of New Caledonia. A description based on field data is given first. Coastal sea level and open-sea data (bottom pressure, currents) are harmonically and spectrally analysed. The first-order dynamics of this lagoon are dominated by semi-diurnal tides. Except for the passes, diurnal tides and currents are weak, only the two tidal harmonics M-2 and S-2 are subsequently investigated. A numerical model is used to provide a coherent and dense picture of the tidal dynamics of M-2 and S-2 and their variability. The validity of the model is assessed by comparing its results with measured sea level and current data. Amplitudes and phase-lags of the M-2 tide increase from south to north. M-2 currents are maximum in the south and in the passes. S-2 amplitudes increase from south to north but slower than M-2. S-2 phases spread from north-west to south-east. Using model results, the long-term movement of the water mass due to tidal influence is estimated by calculating the residual Lagrangian velocity. (C) Elsevier, Paris.
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收藏
页码:69 / 79
页数:11
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