【摘要】 结合黄河下游王庵切滩导流工程实测资料,对切滩导流过程中引河比降变化、分流比、引河过水断面变化的规律分析表明:引河河势随着引河分流比的加大而变化,引河通过最大流量时对应的分流比为73.3%,引河初始断面与引河最终断面之比小于1/4,原大河河势的变化与引河河势弯化密不可分;初期引河过流流量比较小,大河流量较大,深泓线还在原河道,引河进出口上下游大河河道没有大的变化,但随着引河进口上游大河河道人工扰动的影响和引河流量的加大,大河流量减小,深泓线由大河河道逐步移向引河。更多还原

【Abstract】 The analysis on the variation law of gradient,diversion ratio and flowing section of pilot channel during floodplain dredging for diversion based on the observed data of Wang’an floodplain dredging for diversion project conducted on the lower Yellow River shows that a) the pilot channel regime varies along with the increase of diversion ratio.The corresponding diversion ratio of the maximum discharge of the channel is 73.3%.The ratio of initial cross section and the final cross section is smaller than 1/4 and the variation of the main river regime is closely related with the bends of pilot channel regime.b) at initial stages,the flowing discharge of the pilot channel was smaller,the discharge of the main river greater,the thalweg still in the original channel and the main river cause at the upper stream and downstream of the mouth of pilot channel had no bigger changes.While along with the effect of artificial disturbance happened in the main river cause at the upper stream inlet of the channel and the increased discharge of the channel,the discharge of the main river decreases,the discharge of the pilot channel increases and the thalweg moves gradually from the main river cause to the pilot channel.更多还原