Abstract
The traffic bridges along the route of South-to-North Water Diversion Project are numerous. Once a traffic accident occurs causing pollutants in the channel, the water safety, ecological environment and economic development of water receiving areas along the line will be affected . We investigate the bridges along the channel, focusing on the investigation and analysis of hazardous chemicals, nearby backwater gates and water inlets involving 173 cross-channel bridges with large traffic volume. The risk evaluation index system of sudden water pollution is established in this study, while the risk of different bridges is evaluated. We divide bridges in three risk grades, and delimit key prevention areas and key monitoring objects. And the stress of traffic risk factors on the water quality safety is summarized. It is significant for being regarded as basis for contingency plans, hierarchical responses and emergency material reserve for the middle line of the south-to-north water diversion project.
Highlights
The south-to-north water diversion project is the largest inter-basin water diversion project in the world
The frequency of vehicles passing through bridges is directly related to the probability of sudden water pollution from traffic accidents
The arithmetic mean was taken as the frequency of vehicles passing per hour, and the frequency of vehicles passing per day was obtained
Summary
The south-to-north water diversion project is the largest inter-basin water diversion project in the world. The middle route project is the lifeline connecting the Danjiangkou reservoir with the four provinces of Beijing, Tianjin, Hebei and Henan, of which the average annual water transferred is 9.5 billion m3, and the beneficiary population has reached 53.1 million. It is responsible for more than 70% of urban water supply in Beijing, and the proportion of water supply in the water area is growing. The water supply target of the Middle Route of the south-to-north water diversion project is mainly urban domestic and industrial water along the line, and the water supply network covers 97 outlets and 293 water plants with the high requirements for water quality. The cross buildings and control buildings along the road are dense, and the factors affecting water quality are complex
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