摘要
河流上修建水库后,由于水位抬高,流速减小,来自上游的泥沙在库区大量落淤,直接威胁着水库的使用寿命和大坝安全.采用一维恒定非均匀不平衡输沙数学模型,计算了红水河上岩滩水库1994-1999年的冲淤过程,得到了河床纵剖面淤积形态、干流累积淤积量等结果,并与实测资料进行比较.对比分析表明,在模型参数按常规经验取值条件下,计算的库区淤积量远小于实测值.然后分析干密度、水流挟沙力参数、恢复饱和系数等参数调整对模型计算结果的影响,结合库区实际来沙及淤积情况调整了这些关键参数的取值,使得库区泥沙淤积计算结果与实测值较为接近.
With the operation of a reservoir in a sediment-laden river,the rising of water level and decreasing of velocity in the reservoir result in the significant deposition of sediment transported from upstream,which directly threatens the reservoir lifespan and the safety of dam.A one-dimensional steady model of flow and nonuniform sediment transport is applied to simulate the sedimentation process over the period from 1994 to 1999 in the Yantan Reservoir located in the Hongshui River.The longitudinal bed profile and the accumulated deposition process of the main stream calculated by the model are compared with the measured data.The comparison shows that the calculated volume of sediment deposition is much less than the measured one with the regular parameters used.The effects of various parameter adjustments are then investigated,including the dry density,sediment transport capacity and recovery saturation coefficient.Based on the conditions of incoming sediment and deposition situation in the reservoir,the sedimentation process is simulated again with these key parameters being selected carefully;and the corresponding results are in close agreement with the observed values.
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2013年第1期19-25,共7页
Engineering Journal of Wuhan University
基金
国家自然科学基金面上项目(编号:51079103)
教育部新世纪优秀人才项目(编号:NCET-10-0619)
关键词
数学模型
泥沙淤积
排沙比
岩滩水库
mathematical model
sediment deposition
sediment delivery ratio
Yantan Reservoir
