气候变化领域集成服务门户(CCPortal): The Importance of Organic Content to Fractal Floc Properties in Estuarine Surface Waters: Insights From Video, LISST, and Pump Sampling

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DOI	10.1029/2020JC016787
	The Importance of Organic Content to Fractal Floc Properties in Estuarine Surface Waters: Insights From Video, LISST, and Pump Sampling
	Fall K.A.; Friedrichs C.T.; Massey G.M.; Bowers D.G.; Smith S.J.
发表日期	2021
ISSN	21699275
卷号	126 期号:1
英文摘要	To better understand the nature of flocs of varying organic content in estuarine surface waters, Laser in situ Scattering and Transmissometry, video settling, and pump sampling were deployed in the York River estuary. A new in situ method was developed to simultaneously solve the floc fractal dimension (F), primary particle size (dp), and primary particle density (ρp) by fitting a simple fractal model to observations of effective floc density (Δρ) as a function of floc diameter (df), while ensuring that the integrated particle size distribution was consistent with measurements of bulk apparent density (ρa). When fractal fits were statistically justified, application of the above methods showed the bulk fraction of organic matter (forg) to be well correlated to multiple floc properties. As forg increased, dp and ρa also increased, while ρp, total suspended solids (TSS), and median floc size decreased. Notably for microflocs, neither F nor Δρ was significantly related to either forg or TSS. This indicates that organic matter may partially displace water content within microflocs without fundamentally changing the flocs' inorganic structure. When pooling multiple samples, a marked decrease in F was seen at the transition to macroflocs, and most strongly for high forg cases. This suggested that settling velocities ≥ ∼1 mm/s may produce turbulent stresses that tend to tear macroflocs apart. This study also found that when the fractal theory held, ρp had a near 1:1 correlation with the bulk dry density of filtered TSS, implying that primary particles are tightly bound aggregates of combined mineral and organic components. © 2020 The Authors.
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186533
作者单位	Virginia Institute of Marine Science, William & Mary, Gloucester Point, VA, United States; U.S. Army Engineer Research and Development Center, Vicksburg, MS, United States; School of Ocean Sciences, Bangor University, Bangor, Gwynedd, United Kingdom
推荐引用方式 GB/T 7714	Fall K.A.,Friedrichs C.T.,Massey G.M.,et al. The Importance of Organic Content to Fractal Floc Properties in Estuarine Surface Waters: Insights From Video, LISST, and Pump Sampling[J],2021,126(1).
APA	Fall K.A.,Friedrichs C.T.,Massey G.M.,Bowers D.G.,&Smith S.J..(2021).The Importance of Organic Content to Fractal Floc Properties in Estuarine Surface Waters: Insights From Video, LISST, and Pump Sampling.Journal of Geophysical Research: Oceans,126(1).
MLA	Fall K.A.,et al."The Importance of Organic Content to Fractal Floc Properties in Estuarine Surface Waters: Insights From Video, LISST, and Pump Sampling".Journal of Geophysical Research: Oceans 126.1(2021).