Numerical simulation of an algal bloom in Dianshan Lake -- Journal of Oceanology and Limnology,2016,34(1):231-244

	Cite this paper:
	CHEN Yizhong, LIN Weiqing, ZHU Jianrong, LU Shiqiang. Numerical simulation of an algal bloom in Dianshan Lake[J]. Journal of Oceanology and Limnology, 2016, 34(1): 231-244

Numerical simulation of an algal bloom in Dianshan Lake

CHEN Yizhong^1,2, LIN Weiqing², ZHU Jianrong¹, LU Shiqiang²

1 State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China;
2 Shanghai Academy of Environmental Sciences, Shanghai 200233, China

Abstract:

A hydrodynamic model and an aquatic ecology model of Dianshan Lake, Shanghai, were built using a hydrodynamic simulation module and the water quality simulation module of Delft3D, which is an integrated modelling suite off ered by Deltares. The simulated water elevation, current velocity, and direction were validated with observed data to ensure the reliability of hydrodynamic model. The seasonal growth of diff erent algae was analyzed with consideration of observed and historical data, as well as simulated results. In 2008, the dominant algae in Dianshan Lake was Bacillariophyta from February to March, while it was Chlorophyta from April to May, and Cyanophyta from July to August. In summer, the biomass of Cyanophyta grew quickly, reaching levels much higher than the peaks of Bacillariophyta and Chlorophyta. Algae blooms primarily occurred in the stagnation regions. This phenomenon indicates that water residence time can infl uence algal growth signifi cantly. A longer water residence time was associated with higher algal growth. Two conclusions were drawn from several simulations: reducing the nutrients infl ow had little eff ect on algal blooms in Dianshan Lake; however, increasing the discharge into Dianshan Lake could change the fl ow fi eld characteristic and narrow the range of stagnation regions, resulting in inhibition of algal aggregation and propagation and a subsequent reduction in areas of high concentration algae.

Key words: eutrophication|algae bloom|ecological model|Dianshan Lake

Received: 2014-11-04 Revised: 2014-12-12

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Articles by CHEN Yizhong

Articles by LIN Weiqing

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