气候变化领域集成服务门户(CCPortal): Bar pattern and sediment sorting in a channel contraction/expansion area: Application to the Loire River at Bréhémont (France)

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DOI	10.1016/j.advwatres.2020.103580
	Bar pattern and sediment sorting in a channel contraction/expansion area: Application to the Loire River at Bréhémont (France)
	Cordier F.; Tassi P.; Claude N.; Crosato A.; Rodrigues S.; Pham Van Bang D.
发表日期	2020
ISSN	0309-1708
卷号	140
英文摘要	Bars are large sediment deposits alternating with deeper areas that arise from alluvial river bed instability and forcing. The present study aimed at investigating the combined influence of flow and longitudinal width variations on the co-evolution between bar pattern and sediment sorting in a sandy-gravel river reach. To this goal, a fully non-linear 2D numerical model was developed to reproduce the morphodynamic behavior of bars in a reach of the Loire River consisting in a typical channel expansion/contraction. Numerical results showed that varying water discharge promoted a competition between low and high bar modes: i.e., from alternate to multiple bar patterns. Low bar modes were associated with coarse sediment over bar tops and fine sediment in pools, and this sorting pattern was inverted for higher bar modes. Surface sediment was coarser and the degree of sediment sorting was greater after periods of low than high flow. Due to high sediment mobility, sediment sorting did not significantly modify bar morphodynamics. © 2020 Elsevier Ltd
关键词	Rivers 2D numerical models Channel expansions Longitudinal width Numerical results Sediment deposits Sediment mobility Surface sediments Water discharges Sediments fluvial deposit gravel mobility morphodynamics numerical model river bed river channel sediment transport sorting France Loire River
语种	英语
来源机构	Advances in Water Resources
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/131815
推荐引用方式 GB/T 7714	Cordier F.,Tassi P.,Claude N.,et al. Bar pattern and sediment sorting in a channel contraction/expansion area: Application to the Loire River at Bréhémont (France)[J]. Advances in Water Resources,2020,140.
APA	Cordier F.,Tassi P.,Claude N.,Crosato A.,Rodrigues S.,&Pham Van Bang D..(2020).Bar pattern and sediment sorting in a channel contraction/expansion area: Application to the Loire River at Bréhémont (France).,140.
MLA	Cordier F.,et al."Bar pattern and sediment sorting in a channel contraction/expansion area: Application to the Loire River at Bréhémont (France)".140(2020).