黄河中游粗沙区来沙量与粗泥沙模数变化分析

黄河下游河道泥沙淤积与中游多沙、粗沙区的来沙关系非常密切，其中粒径在于０．０５ｍｍ的粗泥沙是淤积下河道的主要成分。通过重点分析不同年代粗沙区来沙量、粗泥沙模数的变化及水利水保措施对减少粗泥沙的作用，说明黄河中游兴建的水利、水土保持工程对控制水土流失、减少入黄泥沙特别是粗颗粒泥沙发挥了很大作用。

Analysis of Coarse Sediment Modulus Change and Sediment Yield in the Coarse Sediment Area in the Middle Yellow River

There has a close relation between sedimentation in the lower reaches and sediment yield in the area with heavy sediment yield and coarse size in the middle reaches in the Yellow River, in which the coarse sediment with size larger than 0.05 mm is the main part of sedimentation in the lower river channel. It is demonstrated in the paper that the construction of hydraulic projects and soil and water conservation measures have played a great role in controlling soil and water loss, reducing sediment into the Yellow River, especially the coarse sediment, through paying attention to analysis of coarse sediment yield, modulus changes and effects of hydraulic projects and water and soil conservation measures on reduction of coarse sediment in various decades.