Transport of organic matter and clay minerals in estuaries of the Arctic sea (Experimental and Field Observations)

Lasareva, E.V.; Romankevich, E. A.

doi:10.1134/s0001437009010068

Cited by 5 publications

(7 citation statements)

References 4 publications

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“…Transitional flows may thus affect spatial distributions of sediment that reflect these environmental controls on clay type and abundance. For example, Lasareva and Romankevich (2009) showed that, in the presence of dissolved organic substances, kaolinite and bentonite adopt different coagulation properties that result in kaolinite being able to cross the river-seawater transition, but in bentonite being unlikely to cross this transition as a result of rapid settling from suspension.…”

Section: Further Implicationsmentioning

confidence: 99%

Comparing the transitional behaviour of kaolinite and bentonite suspension flows

Baas

Best

Peakall

2016

Earth Surf Processes Landf

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Past research has demonstrated the dramatic effects that variations in suspended clay can have on the properties of flow by producing a range of transitional flows between turbulent and laminar states, depending on clay concentration and fluid shear. Past studies have been restricted to kaolinite flows, a clay mineral that has relatively weak cohesive properties. This paper extends these studies to suspension flows of bentonite, a clay mineral that attains higher viscosities at far lower volumetric concentrations within a flow. The results show that the types of transitional flow behaviour recognized in past studies can also be found in bentonite suspension flows, but at lower suspended sediment concentrations, thus demonstrating an even more dramatic effect on flow properties, and potentially on sediment transport and resulting bed morphology, than kaolinite flows. The paper proposes new stability diagrams for the phase space of bentonite flows and compares these to past work on kaolinite suspension flows. These new data suggest that the transitional-flow Reynolds number can be used to delineate the types of transitional flow across different clay types and assess modern and ancient clay-suspension flows.

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Section: Further Implicationsmentioning

confidence: 99%

Comparing the transitional behaviour of kaolinite and bentonite suspension flows

Baas

Best

Peakall

2016

Earth Surf Processes Landf

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“…The main suspended riverine runoff minerals that are genetically related to soils and sedimentary rocks are clays, carbonates, oxides, and hydroxides of Fe and Al (Orlov, 1990). Previously, we showed that different clay suspensions under increasing salinity had different aggregative stabilities (Lasareva & Romankevich, 2009). Montmorillonite particles coagulate and form aggregates at 1-2‰ salinity, while the kaolinite suspension is more stable, allowing the suspension to migrate through the mixing zone (Figure 3).…”

Section: Coagulation Of Modal Mineral Suspensions At Increasing Salinitymentioning

confidence: 99%

Organic Matter and Mineral Interactions Modulate Flocculation Across Arctic River Mixing Zones

et al. 2019

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The focus of this study is organic matter changes and suspended particle and colloid behavior in riverine and marine water mixing zones. Laboratory experiments demonstrated that salinity, clay mineral type, and the nature of dissolved organic matter (DOM) have a strong influence on mineral suspension stabilities (clays, carbonates, and ferric hydroxide), which represent the main fractions of particulate and colloidal matter riverine export. Clay mineral modification by humic acids stabilizes suspensions under increasing salinity, resulting in greater export of particles to coastal zones. Simultaneously, modified particles are more efficiently aggregated by a flocculant than nonmodified particles. Field investigations were conducted in Arctic river mixing zones, providing new information about colloid matter and colloid organic carbon distributions in the mixing zones, which agreed well with laboratory studies. The ratio between colloid organic carbon and suspended matter may prove a useful criterion to distinguish effective flocculation zones. Arctic River DOM fluorescence suggests dominance of terrigenous humic substances in mixing zones as well as coprecipitation by coagulation and flocculation. Our findings may reconcile reports of nonconservative behavior of DOM previously reported in the mixing zone at salinities of less than 12. We suggest that there is a flocculation mechanism in the estuarine mixing zone, which implies the presence of natural active substances, released during microorganism viral lysis (viral shunting).

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“…However, the presence of OM changes this simple and predictive behavior. For example, HA has been shown to maintain the colloidal clays in suspension during a small to moderate salinity increase (Furukawa et al, 2009;Lasareva and Romankevich, 2009;Tombacz et al, 1998;Tombacz et al, 2004). Other types of OM, such as EPS, also appear to affect flocculation.…”

Section: Introductionmentioning

confidence: 96%

“…Past mechanistic studies of flocculation have relied overwhelmingly on what is known as the DLVO theory (Derjaguin and Landau, 1941;Verwey and Overbeek, 1948), which describes the stability of aqueous colloidal suspension with two major surface-interaction energies: EDL repulsive energy and van der Waals (VDW) attractive energy (Mietta et al, 2009). However, the DLVO theory has been found to be insufficient in order to evaluate the effect of OM on flocculation (Furukawa et al, 2009;Lasareva and Romankevich, 2009;Tombacz et al, 1998;Tombacz et al, 2004) as many types of OM appear to be dominated by non-DLVO surface-interaction energies (Grasso et al, 2002).…”

Section: Introductionmentioning

confidence: 97%

Effect of Organic Matter on the Flocculation of Colloidal Montmorillonite: A Modeling Approach

Furukawa¹

2012

Journal of Coastal Research

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Transport of organic matter and clay minerals in estuaries of the Arctic sea (Experimental and Field Observations)

Cited by 5 publications

References 4 publications

Comparing the transitional behaviour of kaolinite and bentonite suspension flows

Comparing the transitional behaviour of kaolinite and bentonite suspension flows

Organic Matter and Mineral Interactions Modulate Flocculation Across Arctic River Mixing Zones

Effect of Organic Matter on the Flocculation of Colloidal Montmorillonite: A Modeling Approach

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