小浪底水库运用后小花间洪峰增值原因分析  

Cause of the Increase of the Flood Peak Discharge in the Lower Yellow River After the Operation of Xiaolangdi Reservoir

作　　者：齐璞[1] 李萍[1] 陈岭 李锐 

机构地区：[1]黄河水利科学研究院,河南郑州450003 [2]小浪底水利枢纽建设管理局,河南郑州450000

出　　处：《人民黄河》2013年第3期4-5,共2页Yellow River

摘　　要：统计了黄河下游小浪底—花园口区间发生洪峰增值的洪水场次,分析了小浪底水库投入运用以来洪峰增值的原因。结果表明:小浪底水库下泄清水造成花园口以上河道床沙粒径变大,床面阻力增大,槽蓄量大;在水库排泄高含沙量水流时,作用于床面上的剪力增大,河床形态阻力突然降低导致流速增大,使得槽蓄量突然减小,洪峰流量、水量沿程增大;其他条件相同时,前期的河道流量越大,槽蓄量越大,引起的洪峰增幅也越大。With the analysis of the various floods with flood peak increase in the reach from Xiaolangdi to Huayuankou in the lower Yellow River, the paper discussed the preliminary reason of the flood peak increase. The results show that： after the operation of Xiaolangdi Reservoir, the clear or low sediment-laden flow discharged from the reservoir has scoured the channel bed of Xiaolangdi-Huayuankou reach, which causes the coarsening of the channel bed and the increase of bed surface resistance and the water storage in the channel. When the hyper-concentrated flow is discharged from the reservoir, the form resistance will be reduced abruptly due to the increase of the bed shear force. Then the flow velocity increases quickly and the water storage is released, which leads to the growth of the flood discharge. Under the same conditions, the more the previous discharge and water storage in the channel are, the greater increase of the peak is.

关 键 词：河床阻力 槽蓄量 水库排沙 洪峰增值 小浪底水库 黄河下游 

分 类 号：I333[文学—其他各国文学]