水科学进展2017，Vol.28Issue(5)：652-661,10.DOI:10.14042/j.cnki.32.1309.2017.05.002
近30年黄河下游河道深泓线摆动特点
Characteristics of channel thalweg migration in the lower Yellow River over the past 30 years
摘要
Abstract
The response of channel thalweg is complex temporally and spatially, so investigating the characteristics of thalweg migration is crucial to the river regime and fluvial processes in the lower Yellow River. Section-and reach-scales thalweg migration widths were calculated based on 91 observed cross-sectional profiles during the period from 1986 to 2015, in order to investigate the characteristics of thalweg migration and to identify the key influencing factor of thalweg migration intensity. It is found that thalweg migration processes were reciprocating, and section-scale migra-tion widths in upper reach were larger than those in middle and lower reaches. The magnitude of migration widths de-creased dramatically after the operation of Xiaolangdi Reservoir, and it is discovered that the thalweg migration widths in the braided, transitional and meandering reach decreased by 47%, 37%, 41%, respectively. The incoming flow and sediment regime is the dominant factor, although channel boundary conditions ( such as floodplain-channel eleva-tion difference, bed material composition) can influence the thalweg migration intensity in the braided reach. The thalweg migration intensity of the braided reach can be expressed as a power function of the previous 4-year average fluvial erosion intensity, and the empirical equation has been verified using the data in 2013—2015.关键词
深泓摆动宽度/摆动强度/水流冲刷强度/游荡段/黄河下游Key words
thalweg migration width/migration intensity/fluvial erosion intensity/braided reach/the lower Yellow River分类
建筑与水利引用本文复制引用
李洁,夏军强,邓珊珊,周美蓉,张诗媛..近30年黄河下游河道深泓线摆动特点[J].水科学进展,2017,28(5):652-661,10.基金项目
国家自然科学基金资助项目( 51379156 （）
51579186) The study is financially supported by the National Natural Science Foundation of China ( No. 51379156 （）
No. 51579186) . （）
