金沙江宜宾段非恒定流过程及传播特性

金沙江、岷江的非恒定流调节过程较为复杂,在宜宾汇合后形成新的非恒定流向下游传播。通过近年实测资料,分析金沙江、岷江非恒定流特征及汇合效果。结果表明:宜宾段非恒定流特征与向家坝电站下泄非恒定流的符合度更高,岷江的非恒定流无典型过程;宜宾段水位变幅和金沙江、岷江水位变幅存在线性关系;涨幅在1.7 m左右,起调水位在1 m左右的泄水波可作为宜宾段非恒定流过程的典型代表,其在下游的传播速度沿程基本保持一致,衰减幅度随着距离的增加而减小。

Procedure and propagation characteristics of unsteady flow in the Jinsha River Yibin section

The unsteady flows adjustment process of the Jinsha River and the Minjiang River are more complicated,and a new unsteady flow to the downstream propagation in Yibin section is formed after the confluence.According to the recent data,the paper analyzed unsteady flow characteristics and convergence effect of the Jinsha River and the Minjiang River.The results show that the unsteady flow characteristics of Yibin section is accordance with the unsteady flow characteristics of Xiangjiaba Hydropower Station;the unsteady flow in the Minjiang River has no typical process;there is a linear relationship of water level amplitude between Yibin section and the Jinsha River and the Minjiang River.Typical process of unsteady flow in Yibin section is a discharge wave which has about 1.7 m rising water level and about 1 m initial water level.Its propagation velocity in the downstream is basically consistent,and the attenuation amplitude decreases with the increase of distance.