论文部分内容阅读
长江南京八卦洲河段是长江下游典型的分汊河段,汊道两岸特别是左汊分布了众多大型国有企业,其河势变化与经济发展密切相关。近年来长江流域水土保持、上游梯级枢纽修建等工程项目的实施,改变了南京河段来水来沙条件,使八卦洲汊道水沙过程发生变异,势必对河床演变造成影响。本文分析了南京八卦洲河段近期河床演变特性,结合水沙分析变化,分析预测该河段的演变趋势。分析结果表明:八卦洲汉道河床横断面形态参数与水沙因子拟合关系较好;随着右汊的河槽冲刷,河床将向窄深方向演变;左汊河槽淤积,河床向宽浅方向发展。
The gossamer section of the Yangtze River in Nanjing is a typical sub-section of the lower reaches of the Yangtze River. There are many large state-owned enterprises across the Taiwan Straits, especially Zuoqian. The changes in the river regime are closely related to economic development. In recent years, the implementation of such projects as water and soil conservation in the Yangtze River Basin and the construction of the upstream cascade hydropower stations has changed the water and sediment conditions in the Nanjing reach, resulting in the variation of the water and sediment processes in the Baogu Channel and will inevitably affect the riverbed evolution. In this paper, the evolution characteristics of the riverbed in Nanjing Bagua Chau River in the near future are analyzed. Based on the analysis of water and sediment changes, the evolution trend of the river section is analyzed and predicted. The results show that the shape parameters of river channel cross section of Bagua Island have a good relationship with the water and sediment factors, and the riverbed will evolve to a narrow depth with the flutes from the right bank. .