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中文摘要：
以汉江中游的襄阳水文站1946—1995年日均流量资料为研究对象，采用变动范围分析（RVA）法分析了丹江口水库建库前后汉江中下游水文情势特征变化，定量评价了水文情势改变程度．结果表明，丹江口水库对汉江中下游河流水文改变程度为39％，属于中度改变．水文情势的改变，影响了水库下游重要生物资源的生态环境条件，破坏了河流生态系统完整性以及生物多样性，建议尽快改变现有水库调度模式，开展丹江口水库生态调度研究．
英文摘要：
Based on the mean daily flows at Xiangyang hydrologic station in the middle reaches of Hanjiang River from 1946 to 1995, the range of variability approach was employed to analyze the hydrological regimes in the middle and lower reaches of Hanjiang River before and after the construction of Danjiangkou Reservoir, and the overall degree of hydrological alteration was quantitatively evaluated. The results show that the overall degree of hydrological alteration is 39% and it belongs to the moderate alternation. The alteration of hydrological regimes influences the ecological environment conditions of the important biotic resources in the lower reaches, and the integrality and biodiversity of the river ecosystem are damaged. Therefore, the existing modes of reservoir operation should be improved and the researches on ecological operation of Danjiangkou Reservoir should be implemented as soon as possible.
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