中文摘要：

南水北调中线工程的实施有利于缓解我国北方缺水问题,但对汉江下游的水文情势与水资源供需关系也会产生一定影响。本文采用蒙大拿法、7Q10法和月保证率设定法计算河道内最小生态环境需水量,采用弃水系数法计算汛期洪水弃水量,在此基础上利用扣损法对现状条件和不同调水方案情景下的水资源可利用量进行计算分析。研究结论为：水资源可利用量随着调水量的增大而减少;调水145亿m3方案下,偏枯水年和特枯水年的供水保障率相对较低,而引江济汉工程可使其水资源可利用量增加,从而满足汉江下游的用水需求;调水82亿m3方案下的整体水资源可利用率要高于其他情景,现状条件下的水资源可利用率最低。

英文摘要：

The implementation of the Middle-route South-to-North Water Diversion Project is helpful to solving the water shortage in North China,but also will have an influence on the relationship between supply and demand of water resources and the hydrological regimes of the lower reaches of the Hanjiang River.Based on calculating the minimum eco-environmental water requirements from the river channel therein in Montana,7Q10 and the monthly guaranteed frequency method,and calculating the abandoned floodwater of flood season in abandoned floodwater coefficient,the deduction method is used to calculate and analyze the water resources availability under present situations and different schemes of the water transfer project.The conclusions are that the water resources availability reduces with the increase in water transfer;the water supply ensuring ratio of extremely low runoff years and below-average runoff years under the scheme of the water diversion of 145×108 m3 is relatively low,while its water resources availability can increase by the water transfer project from Yangtze River to Hanjiang River,thereby meeting the water demand of the lower reaches of Hanjiang River.The availability factor of water resources under the scheme of the water diversion of 82×108 m3 is at the highest level,and the present situation is at the lowest.