水利学报2011，Vol.42Issue(8)：918-927,10.
无黏性沙质床面上冲积河湾形成和演变规律自然模型试验研究
Experimental study on the formation and development of alluvial river meanders with non-cohesive sand bedded natural river model
摘要
Abstract
Laboratory experiments on riverbed evolution were carried out with non-cohesive sand. River meanders were created in model test by adjusting the rate of flow and the initial river pattern. The law of widening of alluvial rivers was analyzed and studied with experiments. Additionally the evolution of typical river meanders was also investigated. It was revealed that the lateral stability of channels is vital to river meander growth, and the river in this experiment evolved into branching or braided patterns due to the lack of anti-erodibility of sediment, which leading to bank failure. The pattern of bank retreat is related not only to the anti-erodibility of bank, but also to local hydrodynamics feature and bank slope etc. The channel widening rate declines exponentially with time, reflecting the degree of incompatibility between cross section and flow conditions in river. The time-scale of river cross section evolution is far smaller than that of lateral migration of river channel. Typical river meanders develop laterally in the way of local disturbance causing bank failure.关键词
无黏性泥沙/冲积性河湾/自然模型试验/河湾演变/河道展宽Key words
non-cohesive sand/alluvial river meanders/natural river model experiment/river meandering evolution/river channel widening分类
建筑与水利引用本文复制引用
许栋,白玉川,谭艳..无黏性沙质床面上冲积河湾形成和演变规律自然模型试验研究[J].水利学报,2011,42(8):918-927,10.基金项目
国家自然科学基金创新研究群体科学基金 （）
国家自然科学基金资助项目（51009105,50809045,50979066）：水沙科学与水灾防治湖南省重点实验室开放基金 （）
天津大学自主创新基金资助项目 （）
