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为明晰三峡水库蓄水后关洲汊道形态调整对航道条件的影响,采用平面二维水流数学模型,研究了关洲汊道地形变化与水流运动特征及枯水位的关系。结果表明:关洲汊道左汊冲刷发展引起分流比调整,减弱了其对枯水位的控制作用,下游河道冲刷引起的水位降幅向上游传递作用增强;关洲汊道左汊冲刷还导致其下游芦家河汊道进口断面流速左减右增,增加了鸳鸯港边滩淤积及芦家河石泓的冲刷动力条件,不利于芦家河水道航道条件。为了维护上游枯水位的稳定并保证下游浅滩冲刷动力,应对关洲汊道进行守护,对分流比进行控制。
In order to clarify the influence of Guanzhou ballast shape adjustment on waterway conditions after the impoundment of the Three Gorges Reservoir, the planar two-dimensional water flow mathematical model was used to study the relationship between the landform change and the water flow motion and the low water level in Guanzhou Island. The results show that the shunting ratio adjustment is caused by the development of left bank erosion in Guanzhou Bay, which weakens its control over the low water level. The decrease of water level caused by downstream channel scouring enhances to the upstream. The scour of left bank of Guantao Road leads to its downstream The flow rate at the inlet section of Lujiahe Road was reduced from left to right, which increased the siltation of Yuanyang Port side silt and the scouring power of Shihong from Lujiahe River, which was unfavorable to the water conditions of Lujiahe Channel. In order to maintain the stability of the low water level in the upper reaches and ensure the power of the shoal shoal downstream, Guantao Road should be guarded and the diversion ratio should be controlled.