1黄河下游断流情况1．1断流历史回顾根据水文年鉴整编规定，河流在某一断面的日平均流量等于零，称为全日断流；日平均流量不为零，但一日内某些时段流量等于零，则称为间歇断流。断流天数系指全日断流与间歇断流天数之和。黄河从1855年到新中国成立前的近100年间，除1938年国? 1 Discontinuance of the Lower Yellow River 1.1 Historical Review of Disconnection According to the regulation of the reorganization of the Yearbook of Hydrology, the daily average flow of a river at a certain section is equal to zero, which is called full-day cut-off; the average daily flow is not zero, but the traffic Equal to zero, then called intermittent cut off. The number of days off refers to the sum of days off and off days. Nearly 100 years before the establishment of the Yellow River from 1855 to the founding of New China, with the exception of the 1938 state?