长江上游观音背滩航道整治方案

针对长江上游观音背河段暗碛浅区得不到有效冲刷而易出浅碍航的问题，提出了2种不同的整治方案，并采用数值模拟方法建立该河段的平面二维数学模型，对2种方案实施后的整治效果进行研究。结果表明，方案实施后浅区部位水深均在3.5 m以上，达到了预期整治目标。局部水流流态明显改善，设计流量下2种方案的最大流速增幅分别为0.798、0.995 m/s。方案2较方案1对河道边界条件影响更大，局部消滩判数超过临界值3.92，不利船舶通行，因此选择方案1作为推荐方案。研究结果可为该河段后续整治方案的确定提供支撑。

Regulation schemes of Guanyinbei beach in upper reaches of the Yangtze River

Aiming at the problem that the dark moraines in the Guanyinbei reach of the upper reaches of the Yangtze River can not be washed effectively and the shallow area is easy to become shallow and hinder navigation，this paper proposes two different regulation schemes，establishes two-dimensional mathematical model of the reach by numerical simulation method，and studies the regulation effect after implementation of the two schemes.The results show that after the implementation of the scheme，the water depth in the shallow area is above 3.5 m，which achieves the expected regulation goal.The local water flow pattern is significantly improved，and the maximum flow rate increase of the two schemes under the design flow rate is 0.798 m/s and 0.995 m/s respectively.Scheme 2 has a greater impact on the river boundary conditions than scheme 1，and the local beach elimination judgement is more than the critical value of 3.92，which is unfavorable to the passage of ships.Therefore，scheme 1 is selected as the recommended scheme for the beach.The results of the study can provide support for the determination of the subsequent regulation schemes in this section of the river.