长江上游洪水与汉江洪水遭遇规律研究

长江干流与支流洪水互相遭遇容易形成长江流域特大洪水，为进一步优化三峡工程调度方案，充分发挥其巨大的防洪效益，从遭遇次数、遭遇时间、遭遇程度以及洪峰、洪量等角度，采用水文学分析法，重点研究了长江上游与汉江不同量级的洪水遭遇规律。研究表明，长江上游与汉江的中小量级的洪水遭遇频繁，遭遇时间主要发生在7，8，9三个月，洪水遭遇时各自的洪峰，最大7 d和15 d洪水过程无明显相应关系，遭遇后洪水过程重叠程度较高。

Study on encounter rules of floods from Hanjiang River and upper Yangtze River

In the Yangtze River,the encounter of floods from its main stream and branches easily forms big flood.To optimize the operation scheme of TGP and make the best use of its huge flood-control capacity,the encounter rules of floods of different magnitudes from Hanjiang River and upper Yangtze River are studied by the means of hydrological method,from the aspects of encounter frequency,encounter time,encounter magnitude and peak discharge,flood volume.Mid-small flood from upper Yangtze River and Hanjiang River encounters frequently,mainly in July,August and September.The magnitude of flood peak,the maximum flood process of 7 d and 15 d have no obvious corresponding relation,and flood process overlaps greatly when floods encounter.