沉积学报2018，Vol.36Issue(1)：81-91,11.DOI:10.3969/j.issn.1000-0550.2018.010
砂质辫状河心滩坝的发育演化过程探讨——沉积数值模拟与现代沉积分析启示
Discussion on Evolution of Bar in Sandy Braided River: Insights from sedi-ment numerical simulation and modern bar
摘要
Abstract
The sandy braided rivers are widely distributed in the continental facies basin and the bar is important as a sedimentary unit. Domestic and overseas scholars have done researches based on the reservoirs, outcrop and modern sediments. However,no pattern of bar evolution has been built and the influence of braided channel on bar has not been clarified. Therefore, the paper uses the sediment numerical simulation to reproduce the evolution of bar, and verify through modern sediments,and finally build the pattern of bar evolution. The research shows that, firstly, the bar evolution can be divided into three stage,including the formation,growth and migration of the bar,lateral migra-tion of the bar and the formation bar tail which lead to compound bar. Secondly,the head of the bar is eroded by the braided channel,which leads bar migration to downstream. As evolution time goes on,migration rate reduces gradual-ly,and then the bar stabilizes on the position.Thirdly,because of the asymmetry of braided channel,sediment depos-its on one side and sediment erodes on another side of the bar. The bar migrates laterally. At last,the sediment depos-its on the tail of the bar and the bar tail formed. The length of the bar tail reveals the discharge of channel. The larger the discharge of channel is,the longer bar tail is. The elongation of bar tail induces the closure the braided channel and forms compound bar.关键词
砂质辫状河/沉积数值模拟/心滩坝/辫状水道/演化过程Key words
sandy braided river/sediment numerical simulation/bar/braided channel/evolution分类
天文与地球科学引用本文复制引用
张可,吴胜和,冯文杰,郑定业,喻宸,刘照玮..砂质辫状河心滩坝的发育演化过程探讨——沉积数值模拟与现代沉积分析启示[J].沉积学报,2018,36(1):81-91,11.基金项目
国家自然科学基金项目(41372116) （41372116）
国家重大科技专项(2011ZX05009-003)[National Natural Science Foundation of China,No.41372116 （2011ZX05009-003）
Major National Science and Technology Project,No.2011ZX05009-003] （）
