和畅洲段分流比及河槽容积与航道条件关系研究

Study on relationship of diversion ratio,channel capacity and waterway condition of Hechangzhou waterway

为了提高对长江下游和畅州汊道演变规律的认识,以该河段大量实测资料为依据,从分流比、河槽容积以及航道条件的相关关系出发,分析了其河势的演变及航道存在的主要问题。研究表明,在和畅洲右汊分流比小于30%、0 m以下河槽容积小于0.8亿m3时,航道条件总体趋于恶化。对和畅洲水道河势控制和航道整治思路进行了初步的探讨,建议采取的工程措施包括,适当加大右汊分流比、增强右汊水流动力条件、稳定并提高右汊现有河道容积。

To strengthen the understanding of evolution laws at Hechangzhou branch channel in lower Yangtze River, the chan-nel fluvial regime variation and the main problems of waterway are discussed from the perspective of the relationship between di-version ratio, the channel capacity and waterway condition on the basis of massive measuring data. The results show that if the di-version ratio of the right branch is less than 30% and the channel capacity below 0 elevation is less than 80 million m3 , the wa-terway condition deteriorates. The thought of channel regime control and the waterway regulation are studied. The engineering measures are suggested such as increasing the diversion ratio of the right branch, improving the flow dynamic condition of the right branch, stabilizing and increasing the channel volume of the right branch.