Author:
Xue Zongpu,Zhu Wei,Zhu Yuyang,Fan Xihui,Chen Huaimin,Feng Ganyu
Abstract
AbstractThe vertical migration and accumulation of Microcystis colonies is a critical process in algal bloom formation. This work explored the effect of wind and light intensity on the vertical migration of Microcystis colonies. The wind-driven currents, light-driven changes in mass density of colonies, and the effect of colony size was coupled to simulate the vertical motion of colonies via Ansys Fluent and MATLAB. Results showed that light causes Microcystis to exhibit a ‘day-sinking and night-floating’ (d-n) phenomenon, however, wind weakens the phenomenon by forming a turbulent drag force that inhibits the vertical movement of Microcystis. This study proposed a kinetic ratio-based method, that there is a specific equilibrium turbulent kinetic energy and when turbulent kinetic energy of the water body is greater than the equilibrium turbulent kinetic energy, the d-n phenomenon does not occur. For Lake Taihu, the wind-driven turbulent kinetic energy is usually greater than the equilibrium turbulent kinetic energy. Therefore, Microcystis colonies may not exhibit the d-n phenomenon. Our findings provide a new theoretical basis for current process-based models in simulating algal blooms in large shallow lakes.
Funder
Science and Technology Project of Jiangsu Province
Research and Innovation Plan for Postgraduates in Jiangsu Province
Publisher
Springer Science and Business Media LLC
Reference40 articles.
1. Paerl, H. W. & Huisman, J. Climate. Blooms like it hot. Science 320, 57–58 (2008).
2. Yamamoto, Y., Shiah, F. K. & Chen, Y. L. Importance of large colony formation in bloom-forming cyanobacteria to dominate in eutrophic ponds. Ann. Limnol. Int. J Limnol. 47, 167–173 (2011).
3. Chen, Y. W., Qin, B. Q., Teubner, K. & Dokulil, M. T. Long-term dynamics of phytoplankton assemblages: Microcystis-domination in Lake Taihu, a large shallow lake in China. J. Plankton Res. 25, 445–453 (2003).
4. Walsby, A. E. The nuisance algae: Curiosities in the biology of planktonic blue-green algae. Water Treat. Exam. 19, 359–373 (1970).
5. Reynolds, C. S. & Walsby, A. E. Water-blooms. Biol. Rev. 50, 437–481 (1975).
Cited by
6 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献