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首页> 外文期刊>Estuarine Coastal and Shelf Science >Mino River dams discharge on neighbor Galician Rias Baixas (NW Iberian Peninsula): Hydrological, chemical and biological changes in water column
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Mino River dams discharge on neighbor Galician Rias Baixas (NW Iberian Peninsula): Hydrological, chemical and biological changes in water column

机译：邻近加利西亚里亚斯·拜萨斯（西北伊比利亚半岛）的美浓河大坝排放：水柱中的水文，化学和生物变化

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摘要

An unusual intrusion of low-salinity water coming from the Mino River (40 km south of the Ria of Pontevedra) was observed in the Ria of Pontevedra (NW Spain) on 12-13 May, 1998. The abnormally high discharge was due to the sudden release of water from the dams that control the Mino River run-off. This release results in a strong cross-axis salinity gradient: salinity decreases seawards, giving rise to a two-layered circulation pattern, with water near the riverbed moving seawards and water near the surface moving landwards. In addition, a clear gradient of chemical and biological variables was observed in the ria, with decreasing values being evident towards the middle zone. The nutrient salts, the oxygen, the chlorophyll and the phytoplankton patterns suggest the existence of a bloom that penetrates the ria, embedded in a water mass that is fresher than the estuarine one. The high concentration of the phytoplankton Skeletonema costatum was observed as late as May, which also supports the idea that this bloom exhibits the features of a typical early spring bloom in the Rias Baixas and that this is linked to haline stratification that is caused by an important supply of continental water.
机译：1998年5月12日至13日，在蓬特维德拉（西班牙西北部）的Ria地区，观察到米诺河（蓬特维德拉河以南40公里）的低盐度水异常地侵入。异常高的排放是由于从控制美浓河径流的水坝突然释放水。这种释放导致强的横轴盐度梯度：盐度降低了向海的位置，从而形成了两层的循环模式，河床附近的水向海移动，地表附近的水向陆地移动。此外，在ria中观察到化学和生物学变量的明显梯度，中间区域的值明显下降。营养盐，氧气，叶绿素和浮游植物的格局表明存在着一条渗透到河口的水华，水华比河口水更新鲜。直到五月底才观察到高浓度的浮游植物骨骼藻，这也支持这样的观点，即该水华显示出Rias Baixas中典型的早春水华的特征，并且这与重要的盐分分层有关。供应大陆水。

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