【摘要】 汊道分流比的变化特征对分汊河道的演变有着重要影响。文章以东流水道为例,基于汊道分流特征理论,研究不同时间段航道条件的好坏与分流比变化特征之间的关系,并就其在航道整治工程中的应用进行了初步探讨。结果表明:老虎滩北槽为枯水倾向汊道时,航道条件最好;对于洪水倾向汊道,若分流比随流量变化的斜率相对较小,航道条件相对较好,反之,若斜率相对较大,航道条件相对较差;对最新一期整治工程的方案研究显示,整治工程实施后,分流比随流量变化的斜率将会减小,由此可以预期航道条件将会得到一定程度的改善。更多还原

【Abstract】 The characteristic variation of dynamic discharge partitioning in branching river channel regime is of considerable importance with regard to branching river channel evolution. For Dongliu waterway, the relationship between branching channel condition at different periods of time and corresponding discharge ratio variation was characteristically studied based on the theory of channel branching characteristics, and the channel regulation method to which this study applied was preliminarily discussed. The results reveal several points: the north channel branch of Tiger Beach is at best condition as long as it is characterized as dry-water-prone branching channel. For flood-prone branching channel, if the gradient of the ratio of channel discharge partitioning to total discharge is relatively small, then the channel condition should be relatively good, otherwise, if the gradient is large, the channel condition would be relatively disadvantaged. A review on the latest-phase regulation construction plan predicts a decline in the gradient after the implement of construction, which implies an certain improvement of the channel condition due to the regulation measurements.更多还原