Analysis of Dominant Factors for Density Current Sediment Discharge Efficiency of Xiaolangdi Reservoir in 2011
Based on measured data of water and sediment regulation in the process of shaping density current of Xiaolangdi Reservoir before flood season of 2011,this paper has analyzed impact on shaping density current forward of the Reservoir and sediment discharge of Sanmenxia Reservoir water storage capacity before flood season and discharge method,and pointed out that Sanmenxia Reservoir shall store water as much as possible before flood season and gradually enlarge water outflow before discharge in the process of regulation.On the basis of correlation between docking water level and delta vertex elevation,this paper has pointed out that Xiaolangdi Reservoir occurs retrogressive erosion and longitudinal erosion which can greatly increase silt concentration at plunging point of density current when docking water level is close to or is lower than the sedimentation delta vertex elevation of Xiaolangdi Reservoir and is combined with large flow discharging process of Sanmenxia Reservoir.It has combined with water and sediment process of Tongguan Section to make analysis and brought up that longer duration of more than 1,000m3/s Tongguan water inflow makes higher water level of Sanmenxia Reservoir during large clean water discharging period of Sanmenxia Reservoir and particularly the emptying and sediment discharging period,Xiaolangdi Reservoir forms stronger follow-up power of density current and makes erosion or reduced siltation at the end of Xiaolangdi Reservoir under the condition of better water and sediment proportion.And it has reported current boundary condition of the reservoir and pointed out that siltation delta vertex of Xiaolangdi Reservoir is near to the dam,delta vertex gets more fine siltation before flood season and topography condition at the end of Xiaolangdi Reservoir is good for sediment discharge of density current.
Xiaolangdi Reservoir reservoir operation retrogressive erosion density current
Jiang Siqi Ma Huaibao Zhang Junhua Wang Ting Wang Hongwei
Yellow River Institute of Hydraulic Research, YRCC, Key Laboratory of Yellow River Sediment Research Yellow River Engineering Consulting Co., Ltd., Zhengzhou, 450003,China
国际会议
The 5th International Yellow River Forum (第五届黄河国际论坛)
郑州
英文
291-296
2012-09-24（万方平台首次上网日期，不代表论文的发表时间）