在城市建设的过程中，要加强供水河道抵御突发性污染事故的能力。以南渡江下游的海口市供水河道为例，建立突发性水污染事故的水动力水质模型，分析污染物到达龙塘取水口的时间及影响历时。提出在龙塘取水口上游建立节制闸和应急渠道，将上游突发水污染事故产生的污染物云团引排到应急渠道中的措施。水动力水质模拟结果表明，该措施可以有效减少南渡江河流中的污染物总量，使突发性水污染事故不会对供水河道的供水产生影响。

In the process of urban construction, it is necessary for water supply channels to strengthen their ability to withstand sudden pollution accidents. Taking the water supply channels of Haikou city in the lower reaches of Nandu River as an example, we established a hydrodynamic and water quality model and used it to analyze the arrival time and impact duration of pollutants. We proposed that check sluices and emergency channels should be built ahead of the Longtang intake to guide the pollution clouds generated from accidents in the upper reaches into the emergency channel. According to the simulation results of the hydrodynamic and water quality model, this measure could reduce effectively the amount of pollutants in Nandu River and prevent sudden water pollution accidents from affecting the water supply of the channels.