岩滩水库泥沙淤积计算数学模型  

Numerical modeling of sedimentation process in Yantan Reservoir

作　　者：邓春艳[1] 吴卫民[1] 夏军强[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《武汉大学学报（工学版）》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)

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.

关 键 词：数学模型 泥沙淤积 排沙比 岩滩水库 

分 类 号：TV145[水利工程—水力学及河流动力学]