Sudden water pollution accident section and downstream emergency control of open channel
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Abstract:
The middle route of the South-to-North Water Transfer Project is an important source of water for Henan, Hebei, Tianjin, and Beijing, directly benefiting 60 million people. However, water pollution occur frequently in recent years, which not only bring immeasurable impact on the environment but also threaten social and economic development, causing people to worry about the water safety of the open channel water transfer project.Accorded to the demand for emergency regulation and control of sudden water pollution in an open channel, the emergency regulation and control strategies of the accident section and downstream of the accident section are studied. The decision-making of emergency control includes: analyzing the diffusion process of pollutants by a quantitative method of pollutant characteristic parameters, dividing the accident section and downstream of the accident section, and calculating the duration of the whole emergency incident by quantitative method for the accident section. Given the downstream of the accident section, the method of optimizing partition is adopted to identify the unfavorable channel pool and close the control gate downstream of the unfavorable channel pool, and to extend the water supply time of the whole downstream of the accident section.Taking the Xiaohe River control gate - Guyun River as an example, the research results are as follows: Utilizing quantization of pollutant characteristic parameters, the accident section is identified as the Xiaohe River control gate - Hutuo River control gate, Hutuo River control gate - Gangtou Tunnel control gate downstream of the accident section. The duration of the emergency in the accident section was 7.9 h. Downstream of the accident section, two unfavorable drainage pools were identified by optimizing the zoning method, and the water supply time of unfavorable drainage pools was extended 6.13 d and 5.61 d.
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