陆溪口汊道演变对界牌河段河势变化的响应分析

进口节点的挑流作用在鹅头型汊道形成及演变进程中起着重要作用。以长江中下游陆溪口鹅头型分汊河道为例,通过总结其各个演变周期间的异同,分析了进口赤壁山节点在上游界牌河段不同河势条件下对陆溪口汊道演变的影响。结果表明:上游河势变化通过改变节点挑流作用强弱,影响汊道进口水流动力条件,从而最终影响到汊道演变周期进程。

Evolution of Luxikou Braided Channel in Response to the Regime Variation of Jiepai Reach

Junction point at the inlet of river channel plays an important role in the formation and evolution of goose-head braided channels. With Luxikou goose-head braided channel in the middle and lower Yangtze River as an example, we summarized the differences among each evolution cycle. On the basis of this, we analyzed the effects of Chibishan, as a junction point, on the evolution of Luxikou braided channel in the presence of regime variation of Jiepai Reach in the upper stream. The result reveals that the upstream river regime changes the ski-jump role of junction point, affects the hydrodynamic conditions of the inlet, and finally influences the cyclical fluvial process.