Shuifu- Yibin Channel Regulation Affected by Unsteady Flow Released From Xiangjiba Hydropower Station

During the operation of Xiangjiaba Hydropower Station, the unsteady flow released from the Station's daily regulation will exert influence on the channel condition of near-dam reach (Shuifu-Yibin river stretch). Based on the channel regulation scheme, a two-dimensional flow mathematical model is applied to simulate flow movement of the 33km downstream reach. It primarily analyzes the influence of daily regulation on the channel improvement from Shuifu to Yibin. The result shows that release wave will increase the navigation depth in low flow. Channel velocity V, water surface slope J and parameter VJ in rising stage are larger than that of the same water level in steady condition. When the Station discharges flow, transverse velocity in meander channel varies dramatically, increasing the difficulty of ship navigation.