黄河中游粗泥沙集中来源区的确定

利用d≥0.10 mm的粗泥沙输沙模数≥1 400 t/(km2.a)的指标在黄河中游多沙粗沙区中界定出粗泥沙集中来源区面积为1.88万km2,该面积占黄河中游多沙粗沙区面积的23.9%,年产沙量为4.08亿t,占多沙粗沙区年产沙总量的34.5%,产生d≥0.05 mm和d≥0.10 mm的粗泥沙量分别为1.52亿和0.61亿t,占多沙粗沙区相应输沙量的47.6%和68.5%,该区是名符其实的产粗泥沙“大户”。

Determination of Coarse Sand Coming Region of the Middle Yellow River

The determined area of coarse sand concentrated coming region of the middle Yellow River is 18 800 km~2 by using the index of d≥0.10 mm modulus of coarse sand transport ≥1 400 t/(km~2·a).The area makes up 23.9% of the sediment-laden and coarse sand area of the middle Yellow River and annual sediment yield 408 million tons,making up 34.5% of annual sediment yield of that area.The coarse sand of d≥ 0.05 mm and d≥0.10 mm is 152 and 61 million tons respectively,making up 47.6% and 68.5% of corresponding sediment transport of the coarse sand region.This is the influential area in the real sense of the term.