黄河中游多沙粗沙区粗泥沙输沙模数区域分布及产沙量分析

通过对黄河中游多沙粗沙区中d≥0.05 mm和d≥0.10 mm不同粗泥沙年输沙模数级的区域分布及产沙量的分析,得出d≥0.05 mm粗泥沙年输沙模数大于等于2 500、5 000和10 000 t/km2的粗泥沙来源区面积分别为5.82万、1.97万和0.22万km2,对应区域产生的全沙量分别占黄河中游多沙粗沙区全沙量的80.0%、35.6%和5.9%;d≥0.10mm粗泥沙年输沙模数大于等于350、700、1 400和2 800 t/km2的粗泥沙来源区面积分别为5.80万、3.94万、1.88万和1.17万km2,对应区域产生的全沙量分别占黄河中游多沙粗沙区全沙量的79.8%、58.3%、34.5%和24.2%。研究不同输沙模数级的区域分布、面积及产沙量,为粗泥沙集中来源区界定提供支撑。

Analysis on Distribution of Sediment in Different Modulus of Sediment Transport and Sediment Yield of Sediment-Laden and Coarse Sand Producing Region in the Middle Yellow River

Through the analysis on different distribution of annual modulus of coarse sand of d≥0.05 mm and d≥0.10 mm and sediment yield of the sediment-laden and coarse sand area of the middle Yellow River,it obtains that the coarse sand coming area where is greater than and equal to 2 500 t/km~2,5 000 t/km~2 and 10 000 t/km~2 of annual modulus of coarse sand of d≥0.05 mm is 58 200 km~2,19 700 km~2 and(2 200) km~2 respectively and the total load produced in a check area makes up 80.0%,35.6% and 5.9% respectively of the total load of coarse sand region of the middle Yellow River and;the coarse sand coming area where is greater than and equal to 350 t/km~2,700 t/km~2,1 400 t/km~2 and 2 800 t/km~2 of annual modulus of coarse sand of d≥0.10 mm is 58 000 km~2,39 400 km~2,18 800 km~2 and 11 700 km~2 respectively and the total load produced in a check area makes up 79.8%,58.2%,34.5% and 24.2% respectively of the total load of coarse sand region of the middle Yellow River.The study on regional distribution,area and sediment yield of different modulus of sediment transport provides a support to decide the coarse sand concentrated coming area.