1984～1985年度黄河下游安渡凌汛。凌情和历年比较颇具特点。凌期气温前、后期特别低,中期突出偏高,致使封河较早、开河很晚,封河长度不长,冰量不多,但出现了“两封两开”和大流量封河漫滩的严重形势。1984年12月下旬气温骤降,济南、滨州旬平均气 1984 ~ 1985 flood in the lower reaches of the Yellow River flood. Ling Qing and calendar quite quite characteristic. The temperature before and after the Ling period was extremely low and the mid-period was extremely high, which led to the closure of the river earlier and the opening of the river very late. The length of the closure river was not long and the amount of ice was small. However, there were serious situations of “two seals and two open” . The temperature dropped sharply in late December 1984, Jinan, Binzhou average gas ten days