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| The influence of hydrodynamic conditions on the generation mechanism of SWI oxygen flux |
| LV Yi-tao1, ZOU Hao-dong2, ZHAN Hao1, ZHOU Man-yu1, AI Tao1, ZOU Lin-zhi1, ZHOU Tao3, AI Hai-nan1 |
1. Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400044, China;
2. Chongqing Municipal Research Institute of Design, Chongqing 400020, China;
3. Chongqing Haoyang Water Construction Management Co., Ltd., Chongqing 400020, China |
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Abstract Yulin river, a tributary of the Three Gorges reservoir area, was selected as the research object. The change of SWI oxygen flux under 5hydrodynamic conditions (average velocity 0.00, 0.03, 0.07, 0.12 and 0.20m/s) and the influence of hydrodynamic conditions on the generation mechanism of SWI oxygen flux were measured. As the average velocity increases, SWI oxygen flux increased from 1.197mmol/(m2·h) at 0.00m/s to 43.981mmol/(m2·h) at 0.20m/s. The penetration depth of dissolved oxygen also increased. Oxygen entered deeper sediments and got used by microorganisms and reducing substances thus the oxygen consumption increased. In addition, when the average velocity was low, the oxygen consumption of sediments was dominated by biological oxygen consumption. At 0.00m/s and 0.03m/s, the biological oxygen consumption accounted for 85.3% and 57.7% of the oxygen flux. While when the average velocity was high, the proportion of Chemical oxygen consumption and other oxygen consumption in the chemical process in oxygen flux gradually increased.
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Received: 22 July 2019
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