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通过对三门峡库区及下游河道实测输沙资料和淤积物取样分析发现:三门峡库区及下游河道淤积物中,粒径d ≥0.05 m m 的泥沙含量1950 ~1995 年为42.3 % ~44 .5% ,d≥0 .025 m m 的泥沙含量为72 .8 % ~74 .3 % ;从各年代不同粒径组泥沙的百分含量来看,d ≥0 .05 m m 的泥沙含量从50 年代的50 .9 % 减少到90 年代的30 .3 % ,而d ≥0 .025 m m 的泥沙含量从50 年代的81 .8 % 减少到90 年代的61 .9 % ,泥沙有细化的趋势。
Through the analysis of sediment transport data and sediment samples measured in the Sanmenxia reservoir area and the lower reaches of the river, it is found that the sediment content of the sediment with the grain size d ≥0.05 m m in Sanmenxia reservoir area and downstream river sediments is 42.3 % ~ 44. 5%, d≥0. Sediment content of 025 m m is 72. 8% ~ 74. 3%; from the age of different particle size sediment sediment percentage point of view, d ≥ 0. Sediment content of 05 m m from 50 in the 50s. 9% to 30 in the 1990s. 3%, and d ≥0. Sediment content of 025 m m from 81 in the 1950s. 8% to 61 in the 1990s. 9%, the trend of sediment refinement.