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黄河内蒙和豫鲁封冰河段分别于3月20日、2月13日解冻开河。至此,黄河流域1989—1990年度凌汛全部结束。 该年度内蒙河段凌汛特点是;流冰时间长,封河晚;封河流量大,未封冻河段长,水位高;开河早;开河形势比较平稳。 内蒙河段1989年12月气温比常年偏高3—6℃,封河日期比常年推迟近一个月,于12月29日才在昭君坟站下游开始封冻。
The Yellow River Inner Mongolia and the Yulu closure glacial section were thawed on March 20 and February 13, respectively. At this point, the flood season in the Yellow River Basin from 1989 to 1990 all ended. This year, the Inner Mongolia reach is characterized by flood; the flow of ice is long and the closure of the river is late; the flow of the sealed river is large and the length of the river is not frozen; the water level is high; In December 1989, temperatures in the Inner Mongolia reach were 3-6 ° C higher than normal. The closing date of the closure river was nearly one month lower than that of normal years. Only the lower reaches of Zhaojunfen Station began to freeze on December 29.