Risk of sudden water pollution incidents:A case study of the Yangtze-to-Huaihe River Water Diversion Project(Henan section)
The Henan section of the Yangtze-to-Huaihe River Water Diversion Project is listed as one of the ten major water conservancy projects.The main functions are urban and rural water supply and improvement of water ecological environment.The water diversion volume of the project is 500 million m3 in 2030 and 634 million m3 in 2040.The Henan section is mainly composed of two open channels,four storage reservoirs,and three water pipelines.Although the risk of sudden water pollution incidents in four storage reservoirs and three water pipelines is very small,the transportation industry along the two open channels(i.e.,Qingshui River section and Luxin Canal section)is developed and there are many cross buildings,which are prone to sudden water pollution incidents.Once a water pollution incident occurs,it will have a huge impact on drinking water security,industrial water security,and the ecological environment security of the residents in the water receiving area.Therefore,it is of great significance to carry out the risk analysis of sudden water pollution incidents to give full play to the comprehensive benefits of the project,ensure the safety of water supply in the water receiving area,and maintain a good water ecological environment.The risk factors of sudden water pollution incidents in the Henan section were identified based on an investigation of the existing research results of risk analysis and control countermeasures of sudden water pollution incidents in water transfer projects,and an adaptive risk assessment index system was established.The classification criteria and risk level evaluation model comprehensively evaluated the risk levels of sudden water pollution incidents in seven evaluation sections,and risk monitoring and risk control measures for sudden water pollution incidents were proposed.The results showed that:(1)The risk sources of sudden water pollution incidents in the Henan section are road traffic accident risk,sewage discharge risk and other risks.(2)Except that the risk level of sudden water pollution incidents in the Qingshui River section and its sub-reaches from the Shiliang controlling gate to the Houheya controlling gate is significant(grade Ⅱ),the risk level of sudden water pollution incidents in the other five evaluation reaches is large(grade Ⅲ).(3)To reduce the risk of sudden water pollution incidents in the Henan section,it is necessary to further reduce the risk of risk sources and improve the effectiveness of risk control.Support is provided for reducing the occurrence probability and harm degree of sudden water pollution incidents in the Henan section of the Yangtze-to-Huaihe River Water Diversion Project,and is of great significance for giving full play to the comprehensive benefits of the project,ensuring the safety of water supply in the water-receiving area,and maintaining a good water ecological environment.
Henan ProvinceYangtze-to-Huaihe River Water Diversion Projectsudden water pollution incidentrisk assessmentrisk management and control
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