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黄河下游的长垣河段,由东坝:头以下的封丘禅房工程至濮阳渠村分洪闸,为黄河下游由西向东折向东北的大转弯河段,全长56km。是1855年铜瓦厢决口后形成的河道。该河段,河身宽浅、溜势变化无常,支汊纵横交织,滩岸变化复杂,是典型的游荡性河道,历史上堤防决口频繁,素有“豆腐腰”之称。
The lower reaches of the Yellow River, the Changyuan section, consists of Dongba: the Fengqiuhanfang project below the head to the flood diversion gate of Puyang Dicun, a large turning section of the lower Yellow River that turns from west to east to the northeast, with a total length of 56km. It was formed in 1855 after the copper tile burst. The river section, the river body is shallow, the vagaries of the voyage, the branches are intertwined, and the changes of the beach bank are complex. It is a typical wandering river course. Historically, the embankment is often called “tofu waist”.