黄河中游多沙粗沙区重点支流粗泥沙粒径组成分析

利用坝地钻探取样资料分析了泥沙空间分布规律,通过输沙模数指标计算了黄河中游多沙粗沙区重点支流中各级泥沙的产沙量。结果表明:受水流分选作用的影响,表现出坝后淤积物粒径比坝前淤积物粒径粗的特点;受地表组成物质的影响,泥沙粒径空间上整体呈现出由南向北逐渐变粗的趋势;根据多沙粗沙区重点支流泥沙粒径、产沙量分析结果和淤地坝分布情况,可有针对性的开展沟道拦沙工程来达到有效控制泥沙的目的。

Composing analysis of coarse sediment particle diameter in the key branches of rich and coarse sediment areas in the middle stream of Yellow River

Analyzed the space distributing regularity of coarse sediment through using drilling out data in check dams and calculated the produced sand quantity of all sediments through sediment transport modulus index in key branches of rich and coarse sediment areas in the middle stream of Yellow River.The results indicated that coarse sediment particle diameter of back alluvial substance was more coarsely than its before owing to effect current grade of function.The trend became thick from south to north about sediment particle diameter in space considering the earth's surface composing substance.According to analytical result of sediment particle diameter,produce sand quantity and distributing status of check dams in key branches of rich and coarse sediment areas,it was possible to effectively control the sediment by developing block sand project of watercourse.