Water Science and Engineering 2011, 4(4) 396-404 DOI:   doi:10.3882/j.issn.1674-2370.2011.04.004  ISSN: 1674-2370 CN: 32-1785/TV

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Keywords
total dissolved gas supersaturation
dissolved gas in water
experimental study
dam discharge
Authors
LU -QU
RAN -LI
JIA -LI
KE-FENG -LI
LIN -WANG
PubMed
Article by Lu,.Q
Article by Ran,.L
Article by Jia,.L
Article by Ke-feng,.L
Article by Lin,.W

Experimental study on total dissolved gas supersaturation in water

Lu QU1, 2, Ran LI*2, Jia LI2, Ke-feng LI2, Lin WANG2

1. Zhejiang Institute of Hydraulics and Estuary, Hangzhou 310020, P. R. China
2. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, P. R. China

Abstract

More and more high dams have been constructed and operated in China. The total dissolved gas (TDG) supersaturation caused by dam discharge leads to gas bubble disease or even death of fish. Through a series of experiments, the conditions and requirements of supersaturated TDG generation were examined in this study. The results show that pressure (water depth), aeration, and bubble dissolution time are required for supersaturated TDG generation, and the air-water contact area and turbulence intensity are the main factors that affect the generation rate of supersaturated TDG. The TDG supersaturation levels can be reduced by discharging water to shallow shoals downstream of the dam or using negative pressure pipelines. Furthermore, the TDG supersaturation levels in stilling basins have no direct relationship with those in reservoirs. These results are of great importance for further research on the prediction of supersaturated TDG generation caused by dam discharge and aquatic protection.

Keywords total dissolved gas supersaturation   dissolved gas in water   experimental study   dam discharge  
Received 2011-05-01 Revised 2011-10-08 Online: 2011-12-30 
DOI: doi:10.3882/j.issn.1674-2370.2011.04.004
Fund:
This work was supported by the National Natural Science Foundation of China (Grant No. 50979063).
Corresponding Authors: Ran LI
Email: liran@scu.edu.cn
About author:

References:

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