Experimental Study of DO Mass Transfer over Roughened Spillway

Xiang Ju Cheng; Wen Qian Zhao

doi:10.4028/www.scientific.net/AMR.512-515.2304

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 512-515Experimental Study of DO Mass Transfer over...

Experimental Study of DO Mass Transfer over Roughened Spillway

Abstract:

Spillways or chutes have been used for over 3000 years. Recently, new construction materials and design techniques have increased the interest in spillways and chutes to increase dissolved oxygen concentration in water, especially for contaminated city rivers. A series of laboratory experiments were operated to obtain the efficiency of DO mass transfer over roughened spillway. Two kinds of roughened spillway were considered, i.e., stepped and semi-balled spillways. By means of measuring the DO concentration at the crest and downstream of spillways, the experimental results showed that the more the flow rate is, the less the re-aeration ability of roughened spillway is. Compared with the smooth spillway, stepped spillway has the best reoxygenation effect, followed by the spillway whose bottom is pasted some semi-tennis balls, the worst is the smooth spillway. The results highlight that appropriate artificial roughness on the bottom of spillways or chutes may play an important role to increase dissolved oxygen content and improve water quality.

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Periodical:

Advanced Materials Research (Volumes 512-515)

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2304-2307

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.512-515.2304

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Online since:

May 2012

Authors:

Xiang Ju Cheng, Wen Qian Zhao

Keywords:

DO Mass Transfer, Experiment, Roughened Spillway

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