黄河下游的凌讯,每年都给我们带来很大威协,尤其在山东境内,往往河南河道解冻,凌水下浅后,而山东下段河道仍在冰冻期间,加之河道窄狹多曲,最易在这些窄曲河道内,形成冰坝,抬高水位,当堤防不能防御时,即发生溃決或漫溢,造成严重的灾害。据历史上记载,近百年来,在山东历城以下凌汛决口达33次,其中利津一带,决口 LingXin in the lower reaches of the Yellow River brings us a great association every year. In particular, in Shandong, the river courses in Henan are often thawed and the Lingshui River is shallow. However, during the freezing period, It is easy to form ice dams and raise water levels in these narrow-shaped river courses. When the embankments can not be defended, there will be verdicts or overflows, causing serious disasters. According to historical records, nearly a hundred years, the following flood city in Shandong Lunxun burst up to 33 times, including Lijin area, Bukou