Influence of Channel Regulating Structures on the Transportation and Dissipation of Supersaturated Total Dissolved Gas
Bubble dissolution during the flood discharge creates high total dissolved gas (TDG) concentration zones downstream of the dams. The dissipation of supersaturated TDG is a very slow process. Thus, the elevated TDG may remain through the water body for hundreds of kilometers downstream and lead to ga...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2021/6634972 |
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| author | Yun Qing Qian Ma Ran Li Xia Shen XuJin Zhang LinFeng Han |
| author_facet | Yun Qing Qian Ma Ran Li Xia Shen XuJin Zhang LinFeng Han |
| author_sort | Yun Qing |
| collection | DOAJ |
| description | Bubble dissolution during the flood discharge creates high total dissolved gas (TDG) concentration zones downstream of the dams. The dissipation of supersaturated TDG is a very slow process. Thus, the elevated TDG may remain through the water body for hundreds of kilometers downstream and lead to gas bubble disease (GBD) and even mortality in fish. To improve the navigation conditions of waterways, dikes (i.e., a solid structure) of varied sizes and shapes are commonly constructed. However, this would affect the dissipation and transportation of the supersaturated TDG. It would significantly change the turbulence intensity and hydropressure of the flow, which dominates the dissipation of TDG. Therefore, TDG distribution in the waterway differs from that in the natural river. In this study, a numerical simulation of the TDG at the Yangtze River’s upper reaches (one of the inland waterways in China) was conducted with the establishment of a two-dimensional TDG dissipation model. The effect of the dikes’ size and shape was analyzed to assess the influence of the regulation structures on the dissipation and transportation of the supersaturated TDG. Meanwhile, simulation in the study area with the natural topography was also set as blank control. Based on that, impact evaluation of TDG supersaturation on fish under different simulation scenarios was made. This study can provide a scientific basis for reducing the adverse effect of supersaturated TDG in fish and the construction of ecological waterway therefore. |
| format | Article |
| id | doaj-art-e42e9b235f5a45109f641b3aa781cf3b |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-e42e9b235f5a45109f641b3aa781cf3b2025-02-03T01:29:22ZengWileyAdvances in Civil Engineering1687-80861687-80942021-01-01202110.1155/2021/66349726634972Influence of Channel Regulating Structures on the Transportation and Dissipation of Supersaturated Total Dissolved GasYun Qing0Qian Ma1Ran Li2Xia Shen3XuJin Zhang4LinFeng Han5College of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, ChinaChongqing Southwest Research Institute for Water Transport Engineering, Chongqing Jiaotong University, Chongqing 400074, ChinaState Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, ChinaState Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, ChinaChongqing Southwest Research Institute for Water Transport Engineering, Chongqing Jiaotong University, Chongqing 400074, ChinaSchool of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, ChinaBubble dissolution during the flood discharge creates high total dissolved gas (TDG) concentration zones downstream of the dams. The dissipation of supersaturated TDG is a very slow process. Thus, the elevated TDG may remain through the water body for hundreds of kilometers downstream and lead to gas bubble disease (GBD) and even mortality in fish. To improve the navigation conditions of waterways, dikes (i.e., a solid structure) of varied sizes and shapes are commonly constructed. However, this would affect the dissipation and transportation of the supersaturated TDG. It would significantly change the turbulence intensity and hydropressure of the flow, which dominates the dissipation of TDG. Therefore, TDG distribution in the waterway differs from that in the natural river. In this study, a numerical simulation of the TDG at the Yangtze River’s upper reaches (one of the inland waterways in China) was conducted with the establishment of a two-dimensional TDG dissipation model. The effect of the dikes’ size and shape was analyzed to assess the influence of the regulation structures on the dissipation and transportation of the supersaturated TDG. Meanwhile, simulation in the study area with the natural topography was also set as blank control. Based on that, impact evaluation of TDG supersaturation on fish under different simulation scenarios was made. This study can provide a scientific basis for reducing the adverse effect of supersaturated TDG in fish and the construction of ecological waterway therefore.http://dx.doi.org/10.1155/2021/6634972 |
| spellingShingle | Yun Qing Qian Ma Ran Li Xia Shen XuJin Zhang LinFeng Han Influence of Channel Regulating Structures on the Transportation and Dissipation of Supersaturated Total Dissolved Gas Advances in Civil Engineering |
| title | Influence of Channel Regulating Structures on the Transportation and Dissipation of Supersaturated Total Dissolved Gas |
| title_full | Influence of Channel Regulating Structures on the Transportation and Dissipation of Supersaturated Total Dissolved Gas |
| title_fullStr | Influence of Channel Regulating Structures on the Transportation and Dissipation of Supersaturated Total Dissolved Gas |
| title_full_unstemmed | Influence of Channel Regulating Structures on the Transportation and Dissipation of Supersaturated Total Dissolved Gas |
| title_short | Influence of Channel Regulating Structures on the Transportation and Dissipation of Supersaturated Total Dissolved Gas |
| title_sort | influence of channel regulating structures on the transportation and dissipation of supersaturated total dissolved gas |
| url | http://dx.doi.org/10.1155/2021/6634972 |
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