摘要
简要总结了黄河小北干流＂揭河底＂及下游二级悬河等典型河床演变现象的相关研究成果。河床层理淤积及黄河特有的水沙条件是＂揭河底＂形成的前提,高含沙洪水期间水流作用于胶泥块以后引起上下表面脉动压力波传播速度不同而形成的瞬时上举力是发生＂揭河底＂现象的直接原因;黄河高含沙洪水期间河道横向输沙的极不平衡是逐步形成二级悬河典型横断面形态的根本原因。
The paper briefly summarizes the outcomes of related studies on the phenomena of 'bottom revealing' of Xiaobei Artery of the yellow river reach and typical bed evolution of the secondary elevated river on the lower reaches of the Yellow River.(a) The sedimentation of bed lamination and silt-discharge condition peculiar to the Yellow River are predicated on the formation of 'bottom revealing' and the phenomenon of 'bottom revealing' caused by instantaneous uplift of different propagation velocity of up and down surface pulsating pressure caused by flow action to clay lumps during high sediment concentrated flood period is the direct reason.(b) The extreme unbalance of transverse sediment transport during high sediment concentrated flood period of the Yellow River is the fundamental reason to gradually form a typical transversal section of the secondary elevated river.
出处
《人民黄河》
CAS
北大核心
2010年第8期5-7,共3页
Yellow River
关键词
二级悬河
“揭河底”
黄河
secondary elevated river
'bottom revealing'
the Yellow River
