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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.
After the reservoir is built on the river, due to the elevation of the water level and the decrease of the velocity of flow, sediment from the upper reaches is a large quantity of silt deposition in the reservoir area, directly threatening the service life of the reservoir and the safety of the dam.Using one-dimensional constant nonuniform unbalanced sediment transport mathematics Model was used to calculate the scouring and silting process of the Shangyantan Reservoir in Hongshui River from 1994 to 1999. The results of the sedimentation patterns in the longitudinal section of the riverbed and the accumulated siltation of the main stream were compared with the measured data.Comparison analysis showed that when the model parameters were calculated according to the conventional Under the condition of empirical value, the calculated siltation in the reservoir area is far less than the measured value.And then, the influence of the adjustment of dry density, sediment carrying capacity and saturation coefficient on the calculation results of the model is analyzed, The values of these key parameters are adjusted so that the calculation results of sediment deposition in the reservoir area are close to the measured values.