中文摘要：

为了弄清鄂北调水工程实施对汉江中下游干流水文情势的影响,设置了3种情景（S1、S2、S3）运用MIKE模型模拟水文情势,并对其进行对比分析。结果表明,S3情景下汉江中下游各断面年平均流量、水位、流速相对S2情景下的均呈微弱降低趋势,沿程各断面年均流量减幅在5%以内,总体上丹江口水库清泉沟增加引水后对汉江中下游流量、水位和流速的影响微弱;S3情景下汉江中下游各断面年平均流量、水位、流速相对S1情景下的降幅较大,平水年最大降幅分别为47.7%、14.9%、77.2%,沿程各断面流量降幅不均。表明各支流的汇入对干流流量的影响较大,已规划的调水工程和梯级开发对汉江中下游的水文情势影响较大,而鄂北调水工程对其影响较小。

英文摘要：

The purpose of this paper is to understand the effect of north Hubei water transfer project operation on the hydrologic regimes in the middle and lower reaches of Hanjiang River. In this paper, the discharge, water level and velocity are analyzed by the MIKE 11 HD mod- el through the comparison of three kinds of conditions. The results indicate that the average annual discharge, water level and velocity of the each cross section under the third condition are a bit lower than that under the second condition, the fluctuation of discharge along the cross section remains within the range of 5%, the effect of the increment amount of water diversion in the Qingquangoa on the hydrologic regimes in the middle and lower reaches of Hanjiang River is slight. However, the average annual discharge, water level and velocity of each cross sec- tion under the third condition are much lower than that under the first condition, the biggest descent range in the year with P= 50% are 47. 7%, 14.9% and 77.2%, respectively, the descent range of discharge along the cross section is uneven. So we conclude that the inflow of an- abranches presented greatly influence on the discharge of the main stream, and cascaded hydropower development has presented a great influ- ence on the hydrologic regimes in the middle and lower reaches of the Hanjiang River. However, North Hubei Water Transfer Project weakly affects it. This study provides reference data that can make a useful contribution to the management and protection of ecological systems in the middle and lower reaches of the Hanjiang River.