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中文摘要：
通过黄河下游多断面、多钻孔，深层次泥沙淤积物取样级配分析．认为在1960年三门峡水库运行前，下游河道主槽淤积物中0．1mm以上泥沙占广半。以0．1mm为粗泥沙集中来源区界定研究中的粗泥沙界限．0．1mm的粗泥沙输沙模数1400t／（km^2·a）为粗泥沙集中来源区界定指标．界定出黄河中游粗泥沙集中来源区面积为1．88万km^2。该区面积仅占黄河中游多沙粗沙区面积（7．86万km^2）的23．9％，但该区产生的全沙量，d≥0．05mm和0．1mm的粗泥沙量分别占多沙粗沙区相应输沙量的34．5％，47．6％和68．5％，说明该区是名符其实的产粗泥沙“大户”．是当前黄河粗泥沙“源头”治理的重中之重。
英文摘要：
Through the analysis of grain-size sampling of sediment deposition which from many sections, holes and deep layers in Lower Yellow River, we concluded that sediment deposition grain-size larger than 0.1mm in the main channel occupies 50% before 1960, in which year Sanmenxia reservoir operated. The centralized source area of coarse sediment is 18. 8 thousand km^2, according to 2 indexes, one is grain-size larger than 0. lmm, the other is coarse sediment modulus equal to 1400 t/（km^2·a）. The number is 23.9% of over burdened and coarse sediment, which is 78.6 thousand km^2. But the total sediment, coarse sediment of grain-size larger than 0. 05mm and 0.1 mm is 34.5%, 47.60% and 68.5% of corresponding sediment runoff in over burdened and coarse sediment, respectively. The above-mentioned show that the centralized source area of coarse sediment is the maximum yielding sediment region. So this area is harnessed firstly.
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