金沙江、岷江洪水遭遇分析

金沙江为长江上游河段，岷江是长江上游左岸一级支流，两江于四川省宜宾市合江门汇合。依据金沙江屏山站、岷江高场站、两江汇口下游约15．5km处李庄站历史洪水调查资料和1951－1998年实测资料，通过对3站年最大洪峰、时段洪量统计计算，分析两江洪水遭遇、洪水组成，两江合成的年最大洪水中，洪峰流量，24h洪量以岷江为主的多，72h以上时段洪量以金沙江为主的多，时段越长金沙江洪量比重越大。为宜宾及以下河段的防洪设计提供依据。

Analysis on flood encounter of Jinsha river and Minjiang river

Jinsha river is the upper stretch of the Yangtze, while theMinjiang river is a tributary on the left bank of the upper Yangtze. The two rivers converge at Hejiangmen of Yibin city, Shichuan province. Taking advantage of historical flood investigation data and the measured data from 1991～1998 of Pingshan hydrologic station on Jinsha river, Gaoyang hydrologic station on Minjiang river, and Lizhuang hydrologic station located 15 km downstream the confluence of the two rivers, through statistical computation of the annual maximum flood peak, the definite time-interval flood volume, the flood encounter and composition of two rivers are analysed. The analysis results provide design basis for the flood control of Yibin city as well as its lower stretch.