提起黄河,人们自然地会联想到“浊流滚滚,混浪滔滔”的情景。早在春秋时,已有“俟河之清,人寿几何?”的说法,不难推论,河水混浊可能早已如此,至今它仍以最高含沙量闻名于当世。然而,很少有人注意历史时期的黄河在中、下游局部地段曾多次澄清。据我所徐近之先生查考,由公元初 Mention of the Yellow River, people will naturally think of “muddy billowing, surging waves,” the scene. As early as the Spring and Autumn Period, there was already a saying that “the river is clear and the life is geometrical?” It is not hard to deduce that the turbidity of the river may have been so long, and so far it is still famous for its highest sediment concentration. However, few people pay attention to the history of the Yellow River in the middle and lower reaches of the local lot has repeatedly clarified. According to my investigation of Mr. Xu, from early AD