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首页> 外文期刊>Estuarine Coastal and Shelf Science >Modeling study of seasonal and inter-annual variability of circulation in the coastal upwelling site of the El Loa River off northern Chile
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Modeling study of seasonal and inter-annual variability of circulation in the coastal upwelling site of the El Loa River off northern Chile

机译：智利北部埃洛阿河沿岸上升流场环流季节和年际变化的模型研究

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摘要

A three-dimensional numerical model using the Finite Element Method (FEM) was used to diagnose coastal currents off the El Loa River (21° S) in the northern upwelling region of Chile. This site has been recognized as an important spawning zone of the southern anchovy Engraulis ringens. Diagnostic current fields were obtained for summer and winter during the 1997—1998 El Nino conditions and during a "normal" upwelling year. The results show this site as an efficient retention area in the nearshore, because of a reduced cross-shelf flow, a strong alongshore flow and presence of several anticyclonic eddies. A simulated Lagrangian experiment indicated that retention within the nearshore (< 10km) may last for more than 4 days under a steady-state wind condition. Wind regimes and water density fields during 1997—1998 (El Nino) and 1995—1996 ("normal" upwelling) did not cause differences in the general pattern of coastal circulation. However, the magnitudes of both the alongshore and the cross-shelf flows are substantially reduced during El Nino in the nearshore spawning zone, possibly as a consequence of an anomalous water mass in the coastal area. This altered condition may limit the transport and dispersion of anchovy spawning products.
机译：使用有限元方法（FEM）的三维数值模型被用于诊断智利北部上升流区El Loa河（21°S）附近的沿海水流。该地点被认为是南部an鱼Engraulis ringens的重要产卵区。在1997-1998年厄尔尼诺现象期间和“正常”上升期间，获得了夏季和冬季的诊断电流场。结果表明，该站点是近岸的有效滞留区，这是因为交叉架流减少，沿岸流很强以及存在几种反气旋涡。拉格朗日模拟实验表明，在稳定风条件下，近岸（<10 km）内的滞留可能会持续4天以上。 1997年至1998年（厄尔尼诺）和1995年至1996年（“正常”上升流）的风况和水密度场并没有引起沿海环流总格局的差异。但是，在近岸产卵区的厄尔尼诺现象期间，沿岸和跨架水流的幅度都大大降低了，这可能是由于沿海地区水量异常造成的。这种情况的改变可能会限制an鱼产卵产品的运输和扩散。

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