黄河内蒙古段泥沙淤积过程模拟

Simulation of Sedimentation Process of the Inner Mongolia Reach of Yellow River

根据内蒙古河段近年来水来沙资料,采用沙量平衡法对河道淤积情况进行了计算。结果表明:受不利水沙变化影响,内蒙古河段1960-2010年泥沙淤积总体呈增长趋势,1986年前增长缓慢,1986年后急剧增长。利用以河床累计淤积量为特征变量的河床滞后响应模型,分别采用单步解析与多步递推模式对内蒙古河段淤积情况进行了模拟,结果表明两种模式的计算值与实测值均基本吻合,确定性系数分别为0.993、0.957。

Based on the field data of sediment and water volume,the deposition process during 1960-2010 of the Inner Mongolia reach were calculated and studied by using the sediment discharge balance method.The results show that the deposition amount has an increasing trend of slow increase before 1986 and sharp increase after 1986 because of the influence of silt-discharge variations.By applying the delayed response model for fluvial process in which the deposition body was taken as a specific variable,the deposition process of the Inner Mongolia reach was simulated by using two calculation methods including the single-step analytical solution method and the multistep iterative method.The calculation results show that the calculated values of the deposition amount are basically in consistent with the measured values,the correlation coefficients for the single-step and the multistep method are 0.993 and 0.957 respectively.