长江中游武汉河段近期河道演变分析

武汉河段为长江中下游16个第一类重点整治河段之一。根据近年来实测的长江武汉河段地形图,从来水来沙条件、深泓平面、洲滩变化、深槽变化、横断面变化等方面,系统分析了武汉河段的变化,总结了该河段的演变特征。结果表明:(1)该河段河势相对稳定,冲淤变幅小;天兴洲下段有所冲刷,主要与上游来水来沙条件和河道边界条件有关。(2)由于沿岸有多处节点控制,两岸的崩岸险工段均已实施护岸工程,岸线基本稳定;白沙洲汊道分流分沙比相对稳定,没有单向变化的趋势,但洲滩仍将随不同水文年的来水来沙条件变化而发生相应冲淤变化。

Analysis of river channel evolution at Wuhan reach of Yangtze River

Wuhan reach is one of the 16 first grade reaches that need reinforcement in the middle and lower of the Yangtze River. According to the measured topographic map of Wuhan reach, we systematically analyzed the variation characteristics of the reach in recent years from the aspects of incoming water and sediment, thalweg variation, bottomland, deep pool and cross section and also summarized the evolution characteristics of the reach. The results showed that the river regime of the reach was relatively stable and the changes of erosion and deposition were insignificant. The lower section of Tianxingzhou sandbar was eroded, which could be attributed to the upstream coming water and sediment as well as the river channel boundary condition. Because of several controlling nodes along the bank and the implemented revetment engineering, the river bank was basically stable. The flow and sediment diversion of Baishazhou inlet were relatively stable and did not have unidirectional variation trend, however, it is estimated that the bottomland will change with different hydrological years of varied incoming flow and sediment.