Reaeration surging phenomenon with artificial disturbance and theimplication for the impact of turbulent kinetic energy in river
ZHANG Chen1, WANG Hao-bai1, HU Hua-fen2, GAO Xue-ping1, YU Hao1, YAN Qi1
1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China; 2. Haihe River Administrative Bureau of Tianjin, Tianjin 300141, China
Abstract：Nowadays, the disturbance aeration device widely used in the ecological restoration of rivers and lakes. However, it is still not clear how the artificial stir influences the reaeration in rivers. To address this issue, we developed a deep-controlled horizontal push-flow aeration device, which can change the flow velocity of the local water flow in the river channel. In order to investigate the effects of artificial disturbance on the reaeration coefficient of the river, the device was used to conduct an in-situ experiment in the Waihuan river of Tianjin. The results showed that the water velocity increased to 40cm/s and 22 times higher than the original velocity when the device operated. Similarly, the dissolved oxygen concentration increased by 0.6~1.7mg/L (10%). Moreover, five groups of classical rivers reaeration coefficient empirical formulae underestimated the reaeration coefficients. It can be called the river reaeration surging phenomenon under artificial disturbance. There was a significantly positive relationship between the turbulence kinetic energy and reaeration coefficient in the river. Compared with the natural flow, the artificial disturbance enhanced the vertical and longitudinal turbulence kinetic energy and accelerated the dissolved oxygen diffusion in the middle and bottom water, respectively. The increase of the turbulence kinetic energy increased reaeration rate and contributed to reaeration surge. This study provides a scientific basis for the hydraulic methods of improving water quality in urban rivers.
张晨, 王浩百, 胡华芬, 高学平, 于昊, 严琦. 人为扰动下河流复氧激增现象及机制分析[J]. 中国环境科学, 2020, 40(5): 2167-2173.
ZHANG Chen, WANG Hao-bai, HU Hua-fen, GAO Xue-ping, YU Hao, YAN Qi. Reaeration surging phenomenon with artificial disturbance and theimplication for the impact of turbulent kinetic energy in river. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(5): 2167-2173.
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