黄河潼关上下游不同河段淤积量对潼关高程的影响

Influence of sediment deposition in upstream and downstream reaches on surface elevation at Tongguan station in the Yellow River

基于实测大断面资料,采用相关分析法,开展了对三门峡水库自1974年采用蓄清排浑运用方式以来不同河段累计淤积量与潼关高程相关关系的研究,分析了各河段累计淤积量与潼关高程的相关系数。分析结果显示大禹渡以上各河段累计淤积量与潼关高程相关性较好,相关系数为0.83-0.90。大禹渡以下各河段累计淤积量与潼关高程相关性较差,相关系数在0.57以下。相关分析表明,大禹渡以上各河段累计淤积量对潼关高程的抬升产生了主要影响。因此,要控制潼关高程抬升,主要应抑制大禹渡以上各河段的累积性淤积。

Based on observed data of lager cross sections,-volumes of deposition from different reaches were measured since Sanmenxia Reservoir has been used to store clear water and discharge muddy water in 1974. Correlation coefficient between Tongguan elevation and cumulative volume of deposition from each reaches in the upstream and downstream of the Tongguan station are used in the correlation analysis method.Analysis shows that correlativity between Tongguan elevation and cumulative volume of deposition from each reach of the upstream above Dayudu station are better,with correlation coefficients as 0.83-0.90.On the other hand, correlativity between Tongguan elevation and cumulative volume of deposition from each reach of the down- stream river of Dayudu station is worse,with the correlation coefficient less than 0.57.The result indicates that the cumulative volume of deposition in each upstream river reaches above Dayudu station took on a signifi- cant effect on the increase of Tongguan elevation.Therefore,it is important to reduce cumulative deposition on each river reaches upstream the Dayudu station,so as to control water flow level at Tongguan,and to avoid wa- ter level further rising.