Joint dispatching of water quality and quantity for emergency disposal of pollution group in main stream of Huaihe River
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Abstract:
The water transfer project from the upper reaches of the lower reaches of the Yangtze River to the middle reaches of the Huaihe River is a large-scale inter-basin water transfer project, which is mainly based on urban and rural water supply and the development of Jianghuai shipping, combined with irrigation water replenishment and improvement of Chaohu and Huaihe River water ecological environment. The main stream of the Huaihe River is a storage area for the water transfer project from the Yangtze River to the Huaihe River, and there are many tributaries around it. Once a sudden water pollution incident occurs and improperly handled, it will seriously affect the water supply safety of the main stream and the water transfer section.The joint operation of water quality and quantity is a key measure to deal with sudden water pollution incidents and an important part of improving the water ecology of rivers and lakes. A HEC-RAS one-dimensional hydrodynamic-water quality model of the middle reaches of the Huaihe River was constructed for the event of the Huaihe River pollution group caused by the discharge of sewage from the Shaying River. The emergency response effects of five scheduling methods on the Huaihe River pollution group were analyzed, including increasing the flow of Bengbu sluice, increasing the flow of water transfer from the Yangtze River to the Huaihe River, increasing both at the same time, background scheduling ( no water transfer from the Yangtze River to the Huaihe River ) and conventional scheduling ( water transfer from the Yangtze River to the Huaihe River, but not increasing the flow ).The results show that: for the background scheduling, the peak concentration of the pollution mass is the highest, the exceeding time is the longest, the peak length of the pollution mass is the shortest, and the latest to leave Bengbu gate; for conventional scheduling, the peak concentration of the pollution group is high, and the exceeding time is long. For the optimization of Bengbu gate scheduling, the peak concentration of pollution group is high, the time of exceeding the standard is short, the peak length of pollution group is long, and it leaves Bengbu gate earlier. For the optimal operation of the river transfer, the peak concentration of the pollution mass is the lowest and the exceeding time is longer. For the simultaneous optimization scheduling, the peak concentration of the pollution group is low, the time of exceeding the standard is short, the peak length of the pollution group is the longest, and it leaves Bengbu gate earlier.On the whole, optimizing the Bengbu sluice, optimizing the river transfer and optimizing the disposal effect of the pollution group at the same time are better than the background scheduling and conventional scheduling. Increasing the flow rate of Bengbu sluice will increase the flow rate of the main stream of Huaihe River, thus reducing the residence time of the pollution cluster in front of Bengbu sluice, but it also leads to the increase of the peak length of the pollution cluster. Increase the transfer flow, dilute the concentration of the pollution group, so that the peak concentration of the pollution group becomes lower. At the same time, the optimization not only reduces the residence time of the pollution group in the front of the Bengbu gate, but also reduces the peak concentration of the pollution group, but the peak length of the pollution group becomes longer. From different evaluation indexes of disposal effect, the optimal scheduling measures are different. From the perspective of reducing the peak concentration of the pollution cluster, the optimization of the Yangtze River is optimal; from the perspective of reducing the time of exceeding the standard, optimizing Bengbu gate and optimizing at the same time have significant effects ; from the time of the pollution group leaving the Bengbu gate, it is optimal to increase the discharge of the Bengbu gate. In the actual emergency process of sudden water pollution accident, emergency measures should be selected reasonably and flexibly according to the requirements of evaluation index of disposal effect.
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