一、黄河断流实况黄河频繁的季节性断流始于2 0世纪70年代初,有关资料显示,自2 0世纪70年代以来,黄河入海年径流量逐渐变小:2 0世纪6 0年代为575亿立方米,70年代为313亿立方米,80年黄河利津断流情况统计年份断流天数1991161992 8319936 01994 74199512 21996 1361997 2 2 61998 First, the Yellow River cut off the actual situation of the Yellow River frequent seasonal outage began in the early 1970s, relevant information shows that since the 1970s, the Yellow River into the sea, the annual runoff gradually becomes smaller: the 20th century, 60s 57.5 billion cubic meters, 31.3 billion cubic meters in the 1970s, 80 years of the Yellow River, Lijin, the statistics of the year, the number of days of outbreak 1991161992 8319936 01994 74199512 21996 1361997 2 2 61998