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Spatial and temporal distribution of dissolved oxygen in the main stream of the National Nature Reserve for Rare and Endemic Fish in the Upper Reaches of the Yangtze River after reservoir impounding |
Chen SHEN1,2,Pingyu LV3,Yicheng WANG2,Guangheng NI1( ),Shunxin FENG2 |
1. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
2. Research Center for Sustainable Hydropower Development, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
3. Upper Changjiang River Bureau of Hydrological andWater Resources Survey, Chongqing 400014, China |
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Abstract Dissolved oxygen (DO) is one of the important indicators of water body health. The spatial and temporal DO distribution in the main stream of the National Nature Reserve for Rare and Endemic Fish in the upper reaches of the Yangtze River after impounding of the Xiangjiaba and Xiluodu Reservoirs was analyzed using the water temperatures and DO mass concentrations at 7 monitoring sites from July, 2012 to November, 2013. During the monitoring period, the Xiangjiaba Reservoir was impounded 3 times while the Xiluodu Reservoir was impounded once. The results show that: 1) the DO is supersaturated after each impounding, 2) both the DO concentration and the saturation increase significantly after impounding, 3) the confluence of tributaries strongly impacts the DO levels in the main stream, and 4) the increased DO saturation in the river is related to the annual periodic variation of the water temperature and the water-air mixing phenomenon caused by the reservoir discharge mode.
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| Keywords
spatial and temporal distribution of dissolved oxygen (DO)
National Nature Reserve for Rare and Endemic Fish in the Upper Reaches of the Yangtze River
reservoir impounding
Xiangjiaba Reservoir
Xiluodu Reservoir
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Issue Date: 20 January 2015
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Chen SHEN,Pingyu LV,Yicheng WANG, et al. Spatial and temporal distribution of dissolved oxygen in the main stream of the National Nature Reserve for Rare and Endemic Fish in the Upper Reaches of the Yangtze River after reservoir impounding[J]. Journal of Tsinghua University(Science and Technology),
2015, 55(1): 39-45.
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| URL: |
| http://jst.tsinghuajournals.com/EN/ OR http://jst.tsinghuajournals.com/EN/Y2015/V55/I1/39 |
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2015,
Vol. 55
