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Hydrobiologia

, Volume 833, Issue 1, pp 81–93 | Cite as

Dynamics of spatiotemporal heterogeneity of cyanobacterial blooms in large eutrophic Lake Taihu, China

  • Wei Li
  • Boqiang QinEmail author
Primary Research Paper

Abstract

Cyanobacterial blooms caused by eutrophication in Lake Taihu, China are recognized as highly heterogeneous spatiotemporally. It is assumed that the high spatiotemporal heterogeneity of algal blooms is determined by divergence/convergence processes in the fluid medium. To address this issue, three episodes of the dominant spatial patterns of hourly simulated divergence fields of current in Lake Taihu in July of 2012 were analyzed using a hydrodynamic numerical model combined with the Empirical Orthogonal Function (EOF) method. The results showed that, on days that blooms occurred, the first two EOF modes explained 89.4% of the variability and the dominant spatial patterns of stronger convergence zones were in agreement with the regions of bloom occurrence and accumulation. When no blooms occurred, the first EOF mode explained 72.5% of the variability and divergence zones were dominant in the lake. Both the simulated hourly average divergence field and the first EOF mode in the time interval in which blooms occurred further confirmed that blooms accumulate in the current convergence zones. These findings explain the dynamic mechanism of occurrence of cyanobacterial blooms and will facilitate forecasting of short-term blooms for protecting drinking water supplies and managing risk.

Keywords

Cyanobacterial bloom Convergence and divergence EOF analysis Hydrodynamic influence Lake Taihu 

Notes

Acknowledgements

We thank the Taihu Laboratory for Lake Ecosystem Research (TLLER) for providing wind data, and Lake-Watershed Science Data Center, National Earth System Science Data Sharing Infrastructure, National Science & Technology Infrastructure of China and Dr. Kun Shi for providing remote sensing images. This work was jointly supported by the National Natural Science Foundation of China (41471401, Grant 41661134036), the Major Projects on Control and Rectification of Water Body Pollution (2017ZX07203-001), and the Key Program of Nanjing Institute of Geography and Limnology, CAS (NIGLAS2017GH04). We thank Jeremy Kamen, MSc, from Liwen Bianji, Edanz Group China (www.liwenbianji.cn/ac), for editing the English text of a draft of this manuscript.

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and LimnologyChinese Academy of ScienceNanjingChina

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