论文部分内容阅读
基于多沙河流“多来多排”的经验输沙公式,建立了考虑上站来沙量、前期河床累计淤积量、临界输沙水量及干支流泥沙粒径影响的非汛期和汛期输沙量一般表达式。在此基础上,根据黄河内蒙古河段1952-2010年实测的水沙资料,将其应用于黄河内蒙古河段巴彦高勒—三湖河口河段、三湖河口—头道拐河段以及巴彦高勒—头道拐全河段非汛期和汛期输沙量的计算,并应用输沙率法计算了各河段1952-2010年的非汛期和汛期冲淤量及其相应的累计冲淤量。通过输沙量、冲淤量和累计冲淤量计算值与实测值的对比表明,各河段非汛期和汛期输沙量、冲淤量及相应的累计淤积量计算值与实测值的吻合较好,其中非汛期和汛期输沙量计算值和实测值之间的相关系数R2分别约为0.93和0.97;非汛期和汛期冲淤量计算值与实测值之间的相关系数R2分别约为0.80和0.90;非汛期和汛期累计冲淤量之间的相关系数R2分别约为0.94和0.99。结果表明,就吻合程度而言,累计冲淤量优于年冲淤量,汛期优于非汛期。本文建立的冲淤量方法能够很好模拟该河段长历时的非汛期和汛期冲淤过程,可为黄河内蒙古河段输沙量及长期淤积发展趋势的分析提供科学依据。
Based on the empirical formula for sediment transport in the multi-channel river system, we established the non-flood season and flood season considering the amount of sediment on the station, accumulated siltation in the previous river bed, the amount of critical sediment transport, and the grain size of dry- Sediment transport general expression. On this basis, based on the measured water and sediment data of the Inner Mongolia reach of the Yellow River from 1952 to 2010, this method was applied to the Bayanigale-Sanhuhe Estuary, the Three Lakes Estuary-Daucheuai reach of the Yellow River Inner Mongolia, The calculation of sediment discharge in non-flood season and flood season of Yan Daoguai-Touduguai River was carried out, and the sedimentation volume of non-flood season and flood season of each section from 1952 to 2010 and the corresponding cumulative erosion and deposition the amount. The comparison between calculated and measured values of sediment discharge, scour and silt accumulation and cumulative scouring and silting shows that the calculated value of sediment discharge, scouring and silting volume and the corresponding accumulated sedimentation amount in each non-flood season and flood season are in good agreement with the measured values The correlation coefficients R2 between calculated and measured values of non-flood season and flood season were about 0.93 and 0.97, respectively; the correlation coefficients R2 between calculated and measured values of scouring and non-flood season were about 0.80 And 0.90 respectively. The correlation coefficient R2 between the non-flood season and the accumulated flood and scum was about 0.94 and 0.99 respectively. The results show that in terms of the degree of coincidence, the cumulative amount of scouring and silting is better than the amount of scouring and silting, and the flood season is better than the non-flood season. The method of scouring and silting established in this paper can well simulate the non-flood period and the scouring and silting process in this section for a long time, which can provide a scientific basis for the analysis of sediment discharge and long-term deposition in the reach of Yellow River in Inner Mongolia.