1 开封河段概况开封河段在黄河下游右岸,位于黄河下游游荡型河道的尾部,是黄河上有名的“豆腐腰”河段。河道长约2.2km,两岸堤距5.2～12.5km,河槽宽3.1～4.1km,河滩宽2.1～5.4km,纵比降1.7‰～1.8‰。该段主要为沙质河床,河道宽浅、水流散乱,为典型游荡性河段,河道曲折系数1.19,泥沙淤积严重,槽高 1 Kaifeng River Overview Kaifeng reach in the lower reaches of the Yellow River on the right bank, located in the lower reaches of the Yellow River wandering the tail of the river, the Yellow River is famous “tofu waist ” river. The length of the river is about 2.2km, the length of both banks is 5.2 ~ 12.5km, the width of the river is 3.1 ~ 4.1km, the width of the river is 2.1 ~ 5.4km, and the vertical ratio is 1.7 ‰ ~ 1.8 ‰. This section is mainly a sandy riverbed, with wide and shallow waterways and scattered water flow, which is a typical wandering river with a meandering coefficient of 1.19, serious siltation and trough height