Simulation of resuspended sediments resulting from dredging operations by a numerical flocculent transport model

Je, Chung-Hwan; Hayes, Donald F.; Kim, Kyung-Sub

doi:10.1016/j.chemosphere.2007.06.033

Cited by 59 publications

(24 citation statements)

References 15 publications

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“…The hydrodynamic conditions of a river vary with many factors, including anthropogenic activities like dredging (Hayes et al, 2000;Je et al, 2007), trawling (Durrieu de Madron et al, 2005;Ferré et al, 2008), and operation of water conservation projects, and natural factors like wind, storm, and tide (Ferré et al, 2008;Pusceddu et al, 2005). Among these factors, water conservation projects play a key role in influencing the hydrodynamic conditions of a river.…”

Section: Introductionmentioning

confidence: 99%

Effect of water–sediment regulation of the Xiaolangdi Reservoir on the concentrations, bioavailability, and fluxes of PAHs in the middle and lower reaches of the Yellow River

Dong

Xia

Wang³

et al. 2015

Journal of Hydrology

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Keywords:Bioavailability Polycyclic aromatic hydrocarbons (PAHs) Suspended sediment (SPS) Dams Water conservation project Water quality s u m m a r yThe water-sediment regulation of the Xiaolangdi Reservoir is conducted to control the relationship between riverine runoff and sediment transport of the Yellow River; however, there is no research about the effect of water-sediment regulation on the bioavailability and fluxes of hydrophobic organic compounds (HOCs). In this study, water and suspended sediment (SPS) samples were collected downstream of the Xiaolangdi Reservoir before, during, and after the water-sediment regulation in 2013. The 16 priority polycyclic aromatic hydrocarbon (PAH) concentrations of freely dissolved, total dissolved, and SPS-associated were determined. During water regulation, water discharged from the reservoir at a high flow rate led to the resuspension of downstream sediment. During sediment regulation, the sediment ejected from the reservoir resulted in higher SPS concentrations than that during water regulation. Both the freely and total dissolved PAH concentrations in river water during sediment regulation were the highest, followed by the concentrations during water regulation and before regulation. The freely dissolved PAH concentrations in river water during the water-sediment regulation were 2-11 times higher than those before water-sediment regulation. This was due to the fact that the resuspended sediment during water-sediment regulation could release PAHs into water phase, and more contaminants were released from the SPS during sediment regulation than during water regulation. The fluxes of sediment and the 16 priority PAHs (R 16 PAHs) during water-sediment regulation contributed to 32.4% and 35.7% of their annual fluxes, respectively, which were higher than the contribution (22.6%) of water discharge. This study suggested that the water-sediment regulation might reduce the long-term retention of sediment and PAHs in the reservoir. However, the environmental risk of PAHs as well as other contaminants downstream of the reservoir and in the estuary might increase during that period. Therefore, the effect of water-sediment regulation on the bioavailability and environmental risk of HOCs should be considered in the operation and management of the Xiaolangdi Reservoir in the future.

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Section: Introductionmentioning

confidence: 99%

Effect of water–sediment regulation of the Xiaolangdi Reservoir on the concentrations, bioavailability, and fluxes of PAHs in the middle and lower reaches of the Yellow River

Dong

Xia

Wang³

et al. 2015

Journal of Hydrology

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“…toxicant release, sedimentation, light reduction), with direct impacts generally easier to predict. Over the past decade, management of dredging has improved significantly, largely through improved ability to predict the spatial extent and intensity of turbid plumes (Je et al, 2007;Lepland et al, 2009;Wu et al, 2007) but also through a greater understanding on the potential impacts on marine biota (Cooper et al, 2008;Cruz-Motta and Collins, 2004;Koslow et al, 2001;Simonini et al, 2005;Skilleter et al, 2006;Ware et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

Recovery from the impact of light reduction on the seagrass Amphibolis griffithii, insights for dredging management

McMahon

Lavery

Mulligan³

2011

Marine Pollution Bulletin

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A large-scale, manipulative experiment was conducted to examine the extent and rate of recovery of meadows of the temperate Australian seagrass, Amphibolis griffithii to different light-reduction scenarios typical of dredging operations, and to identify potential indicators of recovery from light reduction stress. Shade cloth was used to mimic different intensities, durations and start times of light reduction, and then was removed to assess the recovery. The meadow could recover from 3 months of light stress (5-18% ambient) following 10 months re-exposure to ambient light, even when up to 72% of leaf biomass was lost, much faster recovery rates than has previously been observed for large seagrasses. However, when the meadow had been shaded for 6-9 months and more than 82% of leaf biomass was lost, no recovery was detected up to 23 months after the light stress had ceased, consistent with other studies. Five potential indicators of recovery were recommended.Recovery of seagrass from light reduction 2

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“…Indeed these parameters are responsible for further pollutant scattering under certain climatic or anthropic events, e.g. floods or drought, sediment dredging, and so on [29,30,[38][39][40]. Moreover, theoretical analyses about this type of scattering were based on the same compounds [40,26].…”

Section: Introductionmentioning

confidence: 99%

“…floods or drought, sediment dredging, and so on [29,30,[38][39][40]. Moreover, theoretical analyses about this type of scattering were based on the same compounds [40,26]. This complex case-study is also a good opportunity to test the modified Wagner-OnsagerSamaras (WOS) model [41,42] elaborated within our group [21,24] to explain the effects of coadsorption on the behavior of ions, at first at the solution/air interface [21], and then at the silica/solution interface [24].…”

Section: Introductionmentioning

confidence: 99%

Enhanced metal adsorption on solid suspensions by organic molecules

Elmanfe¹,

Stephan²,

Olier³

et al. 2010

Journal of Colloid and Interface Science

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Simulation of resuspended sediments resulting from dredging operations by a numerical flocculent transport model

Cited by 59 publications

References 15 publications

Effect of water–sediment regulation of the Xiaolangdi Reservoir on the concentrations, bioavailability, and fluxes of PAHs in the middle and lower reaches of the Yellow River

Effect of water–sediment regulation of the Xiaolangdi Reservoir on the concentrations, bioavailability, and fluxes of PAHs in the middle and lower reaches of the Yellow River

Recovery from the impact of light reduction on the seagrass Amphibolis griffithii, insights for dredging management

Enhanced metal adsorption on solid suspensions by organic molecules

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