气候变化领域集成服务门户(CCPortal): Mixing dynamics at river confluences governed by intermodal behaviour

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DOI	10.1038/s41561-022-01091-1
	Mixing dynamics at river confluences governed by intermodal behaviour
	Sukhodolov, A. N.; Shumilova, O. O.; Constantinescu, G. S.; Lewis, Q. W.; Rhoads, B. L.
发表日期	2023
ISSN	1752-0894
EISSN	1752-0908
起始页码	89
结束页码	+
卷号	16 期号:1 页码:17
英文摘要	The extent to which flows mix at confluences is pivotal for determining spatial patterns of water quality and biodiversity. Because mixing processes are complex, predicting rates and characteristic scales of mixing is difficult. Here we introduce a theory for confluence mixing dynamics of shallow flows in which the mixing process is controlled by the switching between two modes of behaviour-one similar to a wake behind an obstacle and the other similar to a mixing layer between two parallel flows. Dye visualizations of mixing in field-based controlled experiments agree with theoretical predictions and support transitional behaviour between the two mixing modes. According to our theoretical framework, the mixing interface can grow rapidly in wake mode, when large vortices are shed from a zone of stagnant flow within the confluence, but lateral shear between incoming flows is negligible. This rapid growth occurs even though flow curvature and shallowness inhibit growth through advective and turbulent lateral exchange of momentum and through bed friction. Our findings provide insight into the importance of different modalities of flow structure in controlling mixing at river confluences, thereby contributing to practical knowledge on the role of confluences in dispersal of contaminants in river systems.
学科领域	Geosciences, Multidisciplinary
语种	英语
WOS研究方向	Geology
WOS记录号	WOS:000899527600001
来源期刊	NATURE GEOSCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/272580
作者单位	Leibniz Institut fur Gewasserokologie und Binnenfischerei (IGB); University of Iowa; University of Waterloo; University of Illinois System; University of Illinois Urbana-Champaign
推荐引用方式 GB/T 7714	Sukhodolov, A. N.,Shumilova, O. O.,Constantinescu, G. S.,et al. Mixing dynamics at river confluences governed by intermodal behaviour[J],2023,16(1):17.
APA	Sukhodolov, A. N.,Shumilova, O. O.,Constantinescu, G. S.,Lewis, Q. W.,&Rhoads, B. L..(2023).Mixing dynamics at river confluences governed by intermodal behaviour.NATURE GEOSCIENCE,16(1),17.
MLA	Sukhodolov, A. N.,et al."Mixing dynamics at river confluences governed by intermodal behaviour".NATURE GEOSCIENCE 16.1(2023):17.