长江中下游河道水力和输沙特性的初步分析──初论分汊河道形成条件

Characteristics on Hydraulic and Sediment Transportation of Middle and Lower Yangtze River Channel──on Formative Conditions of Brauded Channel

本文在描述长江下游来水来沙条件和分析河道形态的基础上，对长江中下游河道的水力和输沙特性作了初步分析，获得了区别长江中下游分汊河道和婉蜒型河道河型综合指标及有利于形成分汊河道的来水来沙条件。文中概略分析了长江中下游分汊河道形态特征，水力和输沙特性与边界条件和河床演变特性之间的关系。

According to the incoming water sediment conditions of the middle and lower Yangtze Riv-er,this paper deals briefly with characteristics on the hydraulic and sediment transportation of the riv-er reaches. On the basis of this analysis,comprehensive criteria distingushing different channel pat-terns and favourable factors forming braided channel are obtained.Finally,it is stated that braidedchannel characteristics,concluding channel cross-section property,hydraulic and sediment trans-porta-tion,boundary condition, and channel evolution,ctc. should be combined in a single entity.