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Berger, C.J., Wells, S.A.,, Modeling the effects of macrophytes on hydrody- namics. J. Environ. Eng., 2008. 134 (9): p. 778-788.

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Article

Modeling Effects of Floating Curtain Weirs and Controlling Algal Blooms in a Subtropical Reservoir of China

1College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang, 443002, Hubei, China

2Faculty of Science and Engineering, City University, Dhaka 1216, Bangladesh;Faculty of Engineering, Bangladesh University of Engineering and Technology (BUET), Dhaka-1000, Bangladesh

3Hubei Key Laboratory of Ecological Restoration of River-lakes and Algal Utilization, Hubei University of Technology, Wuhan 430068, China

4International Relations, Department of Political Science, NU, Bangladesh


American Journal of Water Resources. 2019, Vol. 7 No. 2, 42-49
DOI: 10.12691/ajwr-7-2-1
Copyright © 2019 Science and Education Publishing

Cite this paper:
Ranojit Kumar Dutta, Jun Ma, Baishakhi Das, Defu Liu. Modeling Effects of Floating Curtain Weirs and Controlling Algal Blooms in a Subtropical Reservoir of China. American Journal of Water Resources. 2019; 7(2):42-49. doi: 10.12691/ajwr-7-2-1.

Correspondence to: Ranojit  Kumar Dutta, College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang, 443002, Hubei, China. Email: ranojit.dutta83@gmail.com

Abstract

Algal blooms occur frequently in Xiangxi Bay (XXB), which is one of the largest tributaries of the Three Gorges Reservoir (TGR). Floating curtain weirs (FCWs) are hydraulic structures that act as a barrier to divert density currents and diffuse heat across the width of the water body. Numerical modeling of FCWs is become a widely accepted method for controlling algal blooms. A laterally averaged two-dimensional hydrodynamic and water quality model (CE-QUAL-W2) was used to simulate the effects of FCWs, including those on water temperature, hydrodynamics and chlorophyll-a concentrations, for XXB. The developed model was calibrated using data collected in XXB from January to December 2010. The results indicated that the maximum chlorophyll-a concentrations observed were 74-154 mg/m3 at the XX09, XX06 and XX01 sampling sites. The performance of the FCWs suggests that the overall chlorophyll-a concentrations are markedly reduced by more than 85% as a function of the FCW heights and locations. Seasonally, an algal bloom reduction rate of more than 62% was observed in the summer. FCWs with heights of 3, 5, and 7 m reduced algal blooms by up to 99% at XX09 during March 26-28, April 24-27, July 18-26, August 5-20, and 23-28, and September 3-8 and 12-16, respectively. Therefore, the proposed FCWs can reduce algal blooms and improve water quality to save domestic water and aquatic ecosystems in XXB.

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