多沙河流水库淤积形态与库容分布耦合设计

Coupling design for sedimentation pattern and storage capacity distribution of reservoirs in sediment-laden rivers

针对多沙河流水库运行过程中由于入库含沙量较高,库区往往会发生严重泥沙淤积而侵占水库有效库容,造成水库使用年限降低、损害水库综合效益发挥等问题,为保障多沙河流水库库容充足和长效运行,通过分析水库拦沙期和正常运用期内库区泥沙冲淤变化规律,发现多沙河流水库库区存在高滩深槽、高滩中槽、高滩高槽3种泥沙淤积形态,提出了多沙河流水库淤积形态与库容分布耦合设计方法和“深槽调沙、中槽兴利、高槽调洪”的库容分布模式,以及以高滩高槽淤积形态为下边界的防洪高水位、校核洪水位、移民水位等特征水位设计新方法。

Due to the high sediment content in the operation of the reservoirs in sediment-laden rivers,the effective reservoir storage capacity is often occupied by serious sediment deposition,which leads to the reduction of the service life of the reservoir and the damage to the comprehensive benefit of the reservoir.In order to ensure the sufficient and long-term operation of the sediment laden river reservoirs,three sediment deposition patterns for sediment laden river reservoirs were revealed based on the changes in sediment erosion and deposition during the sediment retention period and normal operation period of the reservoirs,including high beach with deep channel,middle channel and high channel.A coupling design method between the sediment deposition patterns and the storage capacity distribution in the sediment-laden river reservoirs was proposed.The storage capacity distribution model of deep channel for sediment regulation,middle channel for profit promotion,and high channel for flood regulation was established.A new design method of flood control high water level,check flood level and migration level is developed based on the siltation form of high beach and high channel.