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On the horizontal distribution of algal-bloom in Chaohu Lake and its formation process

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Abstract

Based on the remote sensing images of algae, the present work analyzes the horizontal distribution characteristics of algal blooms in Chaohu Lake, China, which also reveals the frequency of algal blooms under different wind directions. Further, an unstructured-grid, three-dimensional finite-volume coastal ocean model (FVCOM) is applied to investigate the wind-induced currents and the transport process to explain the reason why algal blooms occur at the detected places. We first deduce the primary distribution of biomass from overlaid satellite images, and explain the formation mechanism by analyzing the pollution sources, and simulating the flow field and transportation process under prevailing wind over Chaohu Lake. And then, we consider the adjustment action of the wind on the corresponding day and develop a two-time scale approach to describe the whole formation process of algae horizontal distribution in Chaohu Lake. That is, on the longer time scale, i.e., during bloom season, prevailing wind determines the primary distribution of biomass by inducing the characteristic flow field; on the shorter time scale, i.e., on the day when bloom occurs, the wind force adjusts the primary distribution of biomass to form the final distribution of algal bloom.

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Authors and Affiliations

  1. Laboratory for Mechanics in Fluid Solid Coupling System, Institute of Mechanics, Chinese Academy of Sciences, 100190, Beijing, China

    Yuan-Ying Chen & Qing-Quan Liu

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  1. Yuan-Ying Chen
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  2. Qing-Quan Liu
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Correspondence to Qing-Quan Liu.

Additional information

The project was supported by the Hundred Talents Program of Chinese Academy of Sciences and the National Natural Science Fundation of China for Distinguished Young Scholar (10825211).

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Chen, YY., Liu, QQ. On the horizontal distribution of algal-bloom in Chaohu Lake and its formation process. Acta Mech Sin 30, 656–666 (2014). https://doi.org/10.1007/s10409-014-0078-x

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  • DOI: https://doi.org/10.1007/s10409-014-0078-x

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