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首页> 外文期刊>Estuarine Coastal and Shelf Science >Analysis Of Hydrobiological Pattern In The Bizerte Lagoon (tunisia)
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Analysis Of Hydrobiological Pattern In The Bizerte Lagoon (tunisia)

机译：比塞大泻湖（突尼斯）的水生生物模式分析

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This study deals with the use of a multivariate analysis method in order to understand the functioning of the Bizerte lagoon ecosystem. A set of hydrobiological parameters was collected during 10 monthly campaigns in 2004. A variant of the EOF (Empirical Orthogonal Function) technique is used to examine hydrobiological variability modes in this lagoon. The permanent features characterising the lagoon are obtained by applying the EOF technique to data after removing the annual cycle. Two major modes were obtained. The first one shows a contrast between the northern sector of the lagoon, influenced by the Mediterranean Sea, and the southern one influenced by continental waters. This mode is mostly prominent for temperature and salinity. The second mode shows a contrast between shallow waters along the coastal zones and the deep central area of the lagoon. This contrast is more pronounced towards the southwestern edge of the lagoon, a region of important freshwater input from the Tinja channel, which drifts towards the downstream area of Menzel Bourguiba. This second mode may also correspond to northward water circulation under southerly wind blowing frequently in summer. The spatial and temporal variability in the lagoon is highlighted by applying the EOF to the raw data without removing the annual cycle. A weight series is obtained for each variable by extracting the corresponding data and then projecting them on the corresponding eigenvector. Using this technique, only one mode was found dominant with more than 52% of the total variance. It was also found that the north-south contrast of temperature, salinity and phosphorous and the coast-centre contrast of Chlorophyll a are enhanced in summer. Other variables such as ammonia and nitrate also show significant annual cycles but with local patterns.
机译：这项研究涉及使用多元分析方法以了解比塞大泻湖生态系统的功能。在2004年的10个每月活动中收集了一组水生物参数。使用EOF（经验正交函数）技术的一种方法来检查该泻湖中的水生物变异模式。在去除年度周期后，通过将EOF技术应用于数据可获得表征泻湖的永久特征。获得了两种主要模式。第一个图显示了受地中海影响的泻湖北部地区与受大陆水域影响的南部地区之间的对比。此模式对于温度和盐度最为突出。第二种模式显示了沿海岸带的浅水区与泻湖深处的中心区域之间的对比。这种对比在泻湖的西南边缘更为明显，泻湖是廷贾河道重要的淡水输入区域，该区域向Menzel Bourguiba的下游地区漂移。该第二模式还可以对应于夏季频繁吹南风的情况下的北向水循环。通过将EOF应用于原始数据而无需删除年度周期，可以突出显示泻湖的时空变化。通过提取相应的数据，然后将其投影到相应的特征向量上，可以为每个变量获得一个权重序列。使用这种技术，仅发现一种模式占主导地位，占总方差的52％以上。还发现，夏季温度，盐度和磷的南北反差和叶绿素a的海岸中心反差都增强了。其他变量（例如氨和硝酸盐）也显示出明显的年循环，但具有局部模式。

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