论文部分内容阅读
对小北干流河段的来水来沙情况及冲淤演变情况进行了分析研究。结果表明,1985年11月至1995年10月,该河段来水来沙偏枯,河槽累积淤积严重,河床抬高显著,滩槽高差减小,河槽排洪能力降低,致使小北干流防洪形式更加严峻。1996年汛期龙门出现11 000 m~3/s 大洪水,但洪峰尖瘦,水沙峰不适应,含沙量高,造成了本河段的严重淤积,除渭河入黄口附近外,过流面积平均减少805 m~2,这种演变特点使洪水在演进过程中水位表现高、漫滩严重、洪水演进缓慢、河势变化大,给黄河防洪带来更大困难。
The situation of incoming water and sediment and the evolution of scouring and silting in Xiaobeiganjiang reach were analyzed. The results show that from November 1985 to October 1995, the water coming and going to the littoral section of the reach of the river was partial dry, and the sedimentation of the river channel was serious. The elevation of the riverbed was significant, the height difference of the trough was decreased and the discharge capacity of the channel was reduced. Form more serious. In the flood season in 1996, there was a flood of 11 000 m 3 / s in the gantry, but the peak of the flood peak was thin and the water and sand peak were not suitable. The sediment concentration was high, causing severe siltation in this section. Except for the Weihe River, The area is reduced by an average of 805 m ~ 2. This evolvement has the characteristics of high flood level, serious floodplain, slow flood evolution and large changes of river regime, which bring more difficulties to the Yellow River flood control.