Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR027010 |
Impacts of suspended clay particle deposition on sand‐bed morphodynamics | |
J. Dallmann; C. B. Phillips; Y. Teitelbaum; N. Sund; R. Schumer; S. Arnon; A. I. Packman | |
2020-05-12 | |
发表期刊 | Water Resources Research |
出版年 | 2020 |
英文摘要 | Fine particles (0.1‐100 microns) are ubiquitous within the water column. Observations on the interactions between suspended fine particles and sediment beds remain limited, reducing our ability to understand the interactions and feedbacks between fine particles, morphodynamics and hyporheic flow. We performed laboratory experiments to explore changes in bedform morphodynamics and hyporheic flow following the progressive addition of kaolinite clay to the water column above a mobile sand bed. We characterized these interactions by taking high‐frequency time series measurements of bed topography and freestream clay concentration combined with solute injections and bed sediment cores to characterize subsurface properties. Deposition of initially suspended clay resulted in a decrease of bedform height, celerity and sediment flux by 14%, 22% and 29% when 1000g was accumulated within the bed (equal to clay/sand mass ratio of 0.4% in the bed). The hyporheic exchange flux decreased by almost a factor of 2 for all clay additions, regardless of the amount of clay eventually deposited in the bed. Post experiment sediment cores showed clay accumulation within and below the mobile layer of the bedforms, with the peak concentration occurring at the most frequent bedform scour depth. These results demonstrate the tight coupling between bed sediment morphodynamics, fine particle (clay) deposition, and hyporheic exchange. Suspended and bed load transport rates are diminished by the transfer of suspended load to the sediment via hyporheic exchange. This coupling should be considered when estimating sediment transport rates. |
领域 | 资源环境 |
URL | 查看原文 |
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/249275 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | J. Dallmann,C. B. Phillips,Y. Teitelbaum,等. Impacts of suspended clay particle deposition on sand‐bed morphodynamics[J]. Water Resources Research,2020. |
APA | J. Dallmann.,C. B. Phillips.,Y. Teitelbaum.,N. Sund.,R. Schumer.,...&A. I. Packman.(2020).Impacts of suspended clay particle deposition on sand‐bed morphodynamics.Water Resources Research. |
MLA | J. Dallmann,et al."Impacts of suspended clay particle deposition on sand‐bed morphodynamics".Water Resources Research (2020). |
条目包含的文件 | 条目无相关文件。 |
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