Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2016WR020348 |
Non-Fickian dispersion in open-channel flow over a porous bed | |
Bottacin-Busolin, Andrea | |
2017-08-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:8 |
文章类型 | Article |
语种 | 英语 |
国家 | England |
英文摘要 | Solute transport in rivers has been traditionally represented using one-dimensional models assuming advection and Fickian dispersion along the main flow direction and transient storage in surface and subsurface dead zones. Experimental evidence from several stream tracer studies has shown that the longitudinal scaling of the moments of the breakthrough curves (BTCs) is inconsistent with classic 1-D solute transport models. In this work, simulations of advection and diffusion in a 2-D and 3-D channel flow over a porous bed are presented assuming an exponentially attenuated profile of the transverse mixing coefficient in the porous medium, as suggested by recent experimental and numerical studies. It is shown that the longitudinal transport in the channel is superdiffusive, and the skewness of the concentration distributions can be almost constant over a broad temporal range, with no sign of approaching zero at large times. A sensitivity analysis shows that, at large times, longitudinal dispersion is controlled by the cross-sectional profile of the in-bed transverse mixing coefficient, and by the difference between the average velocity in the channel and in the porous bed. The normalized concentration distributions can be approximated by beta-distributions with time-dependent parameters, and relationships are derived between the scaling of the parameters under power-law approximation and the scaling of the spatial and temporal moments. The results provide new insights into the physical mechanisms that control the anomalous scaling of the moments observed in field tracer studies and opens new possibilities for predictive and inverse modeling of transport processes in rivers and their catchments. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000411202000057 |
WOS关键词 | LONGITUDINAL DISPERSION ; TRANSIENT STORAGE ; SOLUTE TRANSPORT ; MODEL ; STREAMS ; FLUID ; PERSISTENCE ; SKEWNESS ; RIVERS |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/21817 |
专题 | 资源环境科学 |
作者单位 | Univ Manchester, Sch Mech Aerosp & Civil Engn, Manchester, Lancs, England |
推荐引用方式 GB/T 7714 | Bottacin-Busolin, Andrea. Non-Fickian dispersion in open-channel flow over a porous bed[J]. WATER RESOURCES RESEARCH,2017,53(8). |
APA | Bottacin-Busolin, Andrea.(2017).Non-Fickian dispersion in open-channel flow over a porous bed.WATER RESOURCES RESEARCH,53(8). |
MLA | Bottacin-Busolin, Andrea."Non-Fickian dispersion in open-channel flow over a porous bed".WATER RESOURCES RESEARCH 53.8(2017). |
条目包含的文件 | 条目无相关文件。 |
个性服务 |
推荐该条目 |
保存到收藏夹 |
查看访问统计 |
导出为Endnote文件 |
谷歌学术 |
谷歌学术中相似的文章 |
[Bottacin-Busolin, Andrea]的文章 |
百度学术 |
百度学术中相似的文章 |
[Bottacin-Busolin, Andrea]的文章 |
必应学术 |
必应学术中相似的文章 |
[Bottacin-Busolin, Andrea]的文章 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论