Characterisation of space-time variability in stratified and mixed coastal waters (Baie des Chaleurs, Québec, Canada): application of fractal theory
Characterisation of space-time variability in stratified and mixed coastal waters (Baie des Chaleurs, Québec, Canada): application of fractal theory
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分层和混合沿海水域时空变化的表征（加拿大魁北克省Baie des Chaleurs）：分形理论的应用
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发表时间：
1997
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影响因子：
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通讯作者：
Y. Lagadeuc
中科院分区：
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作者：
L. Seuront;Y. Lagadeuc
通过将分形维数的概念应用于变差函数分析，研究了Baie des Chaleurs（加拿大魁北克省）垂直分层和充分混合的水中体内荧光、温度和盐度的可变性作为尺度的连续函数。分形维数广泛应用于空间异质性的描述，在这里似乎是区分物理和生物参数时间序列中的同质性和异质性的有用描述工具。在分层水中，尽管强风的兴起引起了混合，但体内荧光、温度和盐度的结构随着时间的推移保持不变，并且被证明与水柱的整体结构有关。在混合水域中，情况更加复杂，导致体内荧光和盐度的特定行为。在这两种情况下，分形维数之间观察到的差异可以用图案变异性中感知的不同尺度范围来解释，从而可以用图案结构的复杂性来解释。 Wc 还认为，严格自相似性的偏离似乎与剩余循环的垂直结构有关，是不同层次系统组织之间过渡区域的指标。
The vanability of in vivo fluorescence, temperature and salinity in the vertically stratifled and well-mixed waters of the Baie des Chaleurs (Quebec, Canada) was investigated as a continuous function of scale by applying the concept of fractal dimension to variogram analysis. Widely applied to the description of spatial heterogeneity, fractal dimension appears here to be a helpful descriptive tool in discnrninating between homogeneity and heterogeneity In time series of both physical and biologlcal parameters. In stratified waters, the structuration of in v ~ v o fluorescence, temperature and salin~ty remains the same over time, in spite of mixing induced by the rise of a strong wind, and is shown to be associated with the global structure of the water column. In mixed waters, the situation is more complex, giving rise to specific behaviour of in vivo fluorescence and salinity. In both cases, the differences observed between the fractal dimensions can be explained in terms of different ranges of scales perceived in pattern variability and thus, in the complexity of the pattern structure. Wc also suggest that the departure from strict selfsimilarity which seems to be associated with the vertical structure of the residual circulation is an indicator of the transitional zone between different levels of system organisation.