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鹅头分汊河道为极度弯曲的分汊河型,具有河势周期性交替的演变共性,但其平面形态及河势变化特征因时因地而异.为探究长江中下游不同鹅头分汊型河道之间的空间性差异及同一汊道在不同周期演变中的时间性差异,本文从汊道弯曲程度、河势演变周期长短及滩槽冲淤变形幅度等方面总结了鹅头分汊型河道演变的时空差异性,并探讨了产生此差异的主要原因.研究表明,不同汊道进出口节点的走向及进口节点挑流作用的强弱是产生鹅头分汊型河道空间差异的主要原因;对于特定的鹅头型汊道,进口节点挑流作用在上游河势及年内径流过程的影响下发生强弱调整,这是造就其时间性差异的主要因素.
The goose head sub-river is an extremely curved sub-tributary river, which has the cyclical alternation of the river regime, but its plane shape and the variation characteristics of the river regime vary from place to place. Type of river and the time difference of the same channel in different periods of evolution, this paper summarizes the degree of curving, the length of river regime evolution, And the main reason for this difference is also discussed.The results show that the trend of the entrance and exit nodes and the strength of the pick-up effect of the inlet nodes are the main reasons for the spatial differences of goose divergence rivers For a particular gooseneck, the adjustment of the strength of the inlet node under the influence of the upstream river regime and the runoff during the year is the main factor that causes the time difference.