引江补汉工程是南水北调中线工程的后续水源,为保障汉江中下游干流水质安全和湖北省补水区城乡生活供水安全,有必要在工程取水口周边划定饮用水水源保护区。在充分考虑水质保护要求、交通航运、港口建设发展、应急响应需求等因素的基础上,针对三峡调度运行不同水位情况、工程引水代表流量和相应水质条件设计工况情景,基于水动力水质模型计算和应急响应时间估算结果,提出引江补汉工程龙潭溪取水口水源保护区范围建议,为将来保护区划定提供技术支撑。计算结果表明,以龙潭溪取水口为中心划分饮用水水源保护区的径向距离应≥1.3 km。

The river diversion project from the Yangtze River to the Hanjiang River serves as a supplementary water source for the Middle Route of the South-to-North Water Diversion Project. To ensure water quality safety in the middle and lower reaches of the Hanjiang River and to safeguard urban and rural water supplies in Hubei Province, it is essential to delineate a drinking water source protection area around the project’s water intake. In comprehensive considerations on water quality protection requirements, transportation and shipping, port construction and development, as well as emergency response needs, this study designs scenarios for various operational conditions, including different water levels of the Three Gorges Dam, representative flow rates for engineering diversion, and corresponding water quality conditions. It integrates hydrodynamic and water quality model simulations with emergency response time analysis to define and recommend the drinking water source protection zone for the Longtan Creek intake. The results suggest that the protection zone radius around the Longtan Creek intake should be no less than 1.3 kilometers. This recommendation provides technical support for the future delineation of protection areas.