一、黄河中游粗泥沙来源区的治理是当前治黄工作中的首要任务(一)黄河下游的淤积主要是粗泥沙来源区来沙造成的从1950年7月至1960年6月的水沙资料来看(见表1),进入黄河下游的泥沙每平均为17.95亿吨,其中小于0.025毫米的冲泻质占54%,大于O.025毫米的床沙质占46%。淤积在河道中的泥沙, First, the treatment of crude sediment source areas in the middle reaches of the Yellow River is the primary task in the current Yellow River governance work (a) The sedimentation in the lower Yellow River is mainly caused by the sediments from the coarse sediment source area to the sand from July 1950 to June 1960 From the sand data (see Table 1), the average sediment entering the lower reaches of the Yellow River is 1.795 billion tons, of which 54% are less than 0.025 mm and 46% more than 0.025 mm. Sediment sediment in the river,