Energy dissipation efficiency as a new variable in the empirical correlation of total dissolved gas

Abstract Total dissolved gas (TDG) supersaturation, which occurs during dam spilling, may result in fish bubble disease and mortality. Many studies have been conducted to identify the factors pertaining to TDG generation, such as the spilling discharge and tailwater depth. Additionally, the energy d...

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Autores principales:	Jingying Lu, Xiaolong Cheng, Zhenhua Wang, Ran Li, Jingjie Feng, Kefeng Li, Zhongluan Yan
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0fb7718b1496412b857223fc59177eae
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spelling	oai:doaj.org-article:0fb7718b1496412b857223fc59177eae2021-12-02T14:25:22ZEnergy dissipation efficiency as a new variable in the empirical correlation of total dissolved gas10.1038/s41598-021-86144-y2045-2322https://doaj.org/article/0fb7718b1496412b857223fc59177eae2021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-86144-yhttps://doaj.org/toc/2045-2322Abstract Total dissolved gas (TDG) supersaturation, which occurs during dam spilling, may result in fish bubble disease and mortality. Many studies have been conducted to identify the factors pertaining to TDG generation, such as the spilling discharge and tailwater depth. Additionally, the energy dissipation efficiency should be considered due to its effect on the air entrainment, which influences the TDG generation process. According to the TDG field observations of 49 cases at Dagangshan and Xiluodu hydropower stations, the TDG was positively related to the energy dissipation efficiency, tailwater depth and discharge per unit width. A correlation between the generated TDG level and these factors was established. The empirical equations proposed by the USACE were calibrated, and the TDG level estimation performance was compared with the established correlation for 25 spillage cases at seven other dams. Among the considered cases, the standard error of the TDG estimation considering the energy dissipation efficiency was 5.7%, and those for the correlations obtained using the USACE equations were 13.0% and 10.0%. The findings indicated that the energy dissipation efficiency considerably influenced the TDG level, and its consideration helped enhance the precision of the TDG estimation. Finally, the generality of this approach and future work were discussed.Jingying LuXiaolong ChengZhenhua WangRan LiJingjie FengKefeng LiZhongluan YanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jingying Lu Xiaolong Cheng Zhenhua Wang Ran Li Jingjie Feng Kefeng Li Zhongluan Yan Energy dissipation efficiency as a new variable in the empirical correlation of total dissolved gas
description	Abstract Total dissolved gas (TDG) supersaturation, which occurs during dam spilling, may result in fish bubble disease and mortality. Many studies have been conducted to identify the factors pertaining to TDG generation, such as the spilling discharge and tailwater depth. Additionally, the energy dissipation efficiency should be considered due to its effect on the air entrainment, which influences the TDG generation process. According to the TDG field observations of 49 cases at Dagangshan and Xiluodu hydropower stations, the TDG was positively related to the energy dissipation efficiency, tailwater depth and discharge per unit width. A correlation between the generated TDG level and these factors was established. The empirical equations proposed by the USACE were calibrated, and the TDG level estimation performance was compared with the established correlation for 25 spillage cases at seven other dams. Among the considered cases, the standard error of the TDG estimation considering the energy dissipation efficiency was 5.7%, and those for the correlations obtained using the USACE equations were 13.0% and 10.0%. The findings indicated that the energy dissipation efficiency considerably influenced the TDG level, and its consideration helped enhance the precision of the TDG estimation. Finally, the generality of this approach and future work were discussed.
format	article
author	Jingying Lu Xiaolong Cheng Zhenhua Wang Ran Li Jingjie Feng Kefeng Li Zhongluan Yan
author_facet	Jingying Lu Xiaolong Cheng Zhenhua Wang Ran Li Jingjie Feng Kefeng Li Zhongluan Yan
author_sort	Jingying Lu
title	Energy dissipation efficiency as a new variable in the empirical correlation of total dissolved gas
title_short	Energy dissipation efficiency as a new variable in the empirical correlation of total dissolved gas
title_full	Energy dissipation efficiency as a new variable in the empirical correlation of total dissolved gas
title_fullStr	Energy dissipation efficiency as a new variable in the empirical correlation of total dissolved gas
title_full_unstemmed	Energy dissipation efficiency as a new variable in the empirical correlation of total dissolved gas
title_sort	energy dissipation efficiency as a new variable in the empirical correlation of total dissolved gas
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/0fb7718b1496412b857223fc59177eae
work_keys_str_mv	AT jingyinglu energydissipationefficiencyasanewvariableintheempiricalcorrelationoftotaldissolvedgas AT xiaolongcheng energydissipationefficiencyasanewvariableintheempiricalcorrelationoftotaldissolvedgas AT zhenhuawang energydissipationefficiencyasanewvariableintheempiricalcorrelationoftotaldissolvedgas AT ranli energydissipationefficiencyasanewvariableintheempiricalcorrelationoftotaldissolvedgas AT jingjiefeng energydissipationefficiencyasanewvariableintheempiricalcorrelationoftotaldissolvedgas AT kefengli energydissipationefficiencyasanewvariableintheempiricalcorrelationoftotaldissolvedgas AT zhongluanyan energydissipationefficiencyasanewvariableintheempiricalcorrelationoftotaldissolvedgas
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Energy dissipation efficiency as a new variable in the empirical correlation of total dissolved gas

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