长江中游界牌河段过渡段航槽近期变化及趋势预测

摘要

Jiepai river reach is a straight broadening branch river and a famous navigation blocking reach of the middle Yangtze River with unstable mainstream and groove and lots of bottomlands.Although the lower river keeps its branching pattern and the swaying range of the transition section has been limited after the comprehensive management construction the groove is not in full control the upper groove changes radically and the mainstream is unstable as the location of the transition reach was a little lower .To seize the favorable opportunity of controlling the location of the transition section the second phase construction reinforced the lower beach in the transition section of the new delta.This paper mainly analyzes the changes of navigation channel of the transition section after implementation of the second phase of the construction and predicts the development trend of the groove in the transition section.%界牌河段为顺直展宽分汊型河段，河道内洲滩较多，主流及滩槽形态极不稳定，是长江中游著名的碍航河段。综合治理工程实施后虽然下段分汊的格局得到维持，过渡段的摆动范围得到一定的限制，但由于实施时过渡段位置偏下，滩槽并未得到完全控制，上段的滩槽变化仍然较为剧烈，主流不稳定，为抓住控制过渡段位置的有利时机，二期工程对新淤洲前沿的过渡段低滩进行守护。主要分析二期工程实施后过渡段航槽的变化，并对过渡段航槽发展的趋势进行预测。