Experimental Study on the Performance of an Innovative Tide-Induced Device for Artificial Downwelling

Wei Fan, Dongdong Pan, Canbo Xiao, Tiancheng Lin, Yiwen Pan and Ying Chen
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Wei Fan: Ocean College, Zhejiang University, Zhoushan 316000, China
Dongdong Pan: Ocean College, Zhejiang University, Zhoushan 316000, China
Canbo Xiao: Ocean College, Zhejiang University, Zhoushan 316000, China
Tiancheng Lin: Ocean College, Zhejiang University, Zhoushan 316000, China
Yiwen Pan: Ocean College, Zhejiang University, Zhoushan 316000, China
Ying Chen: Ocean College, Zhejiang University, Zhoushan 316000, China

Sustainability, 2019, vol. 11, issue 19, 1-23

Abstract: Hypoxia has been increasingly observed in estuaries and coastal marine ecosystems around the world. In this paper, a tide-powered artificial downwelling device is proposed to potentially alleviate hypoxia in bottom waters. The downwelling device mainly consists of a vertical square tube, a 90° bend sitting on the top of the tube, two symmetrical-guide plates which installed alongside the vertical tube, a static mixer, and an artificial reef. Scale model experiments are performed with respect to different density difference heads, horizontal current velocities, and tube geometries. The results show that the downwelling flow rate is dependent on horizontal current velocity, tube geometry parameters, and the density profile of ambient water. In addition, increasing the equivalent diameter and bend radius of the device can decrease the total loss coefficient in the tube, which in turns enhance the downwelling efficiency. The two symmetrical-guide plates also generate obvious downwelling of surface water which further improves the whole performance of the device. Further work will need to determine the influence of the other parts of the device, such as the static mixer and artificial reef, on the downwelling efficiency.

Keywords: tide-induced; hypoxia; artificial downwelling; marine ranching; dissolved oxygen (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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