Mobility of phosphorus induced by sediment resuspension in the Three Gorges Reservoir by flume experiment

Huang, Lei; Fang, Hongwei; Fazeli, Mehdi; Chen, Yishan; He, Guojian; Chen, Daoyi

doi:10.1016/j.chemosphere.2015.05.009

Cited by 38 publications

(15 citation statements)

References 23 publications

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“…Sediment used in the experiments was obtained from the Guanting Reservoir located in the northwest of Beijing, China using a columnar sampler 59 . This sediment was screened into three groups of size-fractionated sediment, i.e., fine (0.02–0.05 mm), medium-grained (0.05–0.1 mm), and coarse sediments (0.1–0.2 mm).…”

Section: Methodsmentioning

confidence: 99%

Analysis of biofilm bacterial communities under different shear stresses using size-fractionated sediment

Fang

Chen

Huang

et al. 2017

Sci Rep

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Microorganisms are ubiquitous in aqueous environments and are crucial for biogeochemical processes, but their community structures and functions remain poorly understood. In this paper, a rotating reactor was designed to study the effects of substrata and flow conditions on sediment bacterial communities using 16S rRNA gene sequencing, assaying three groups of size-fractionated sediments and three different levels of applied shear stress. Proteobacteria, Firmicutes, and Bacteroidetes were the dominant phyla of the microbial communities, with more anaerobic bacteria and opportunistic pathogens being detected under static water conditions, while more aerobic bacteria were detected under dynamic water flow conditions. Most of the top 10 genera were present in all the samples; however, there were significant differences in the species abundance. Paludibacter and Comamonadaceae_unclassified were the most abundant genera under static and dynamic conditions, respectively. Under static water conditions, the medium-grained sediment had the highest microbial diversity, followed by the fine and coarse sediments. Under dynamic water flow conditions, a higher flow velocity corresponded to a greater microbial diversity. Overall, there was no significant difference in the community richness or diversity between the static and dynamic water flow conditions. This study is beneficial for further understanding the heterogeneities of microbial communities in natural aquatic ecosystems.

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Section: Methodsmentioning

confidence: 99%

Analysis of biofilm bacterial communities under different shear stresses using size-fractionated sediment

Fang

Chen

Huang

et al. 2017

Sci Rep

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“…However, once the sediment is disturbed, the resuspended particle will enter into the overlying water and may release contaminants, resulting in HOC being bioavailable in the overlying water. Therefore, sediment resuspension would exert great influences on HOC concentrations and water quality in aquatic environments Friedman et al, 2009;Huang et al, 2015;Pusceddu et al, 2005;Superville et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Effect of recurrent sediment resuspension-deposition events on bioavailability of polycyclic aromatic hydrocarbons in aquatic environments

Dong

Xia

Wang³

et al. 2016

Journal of Hydrology

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a b s t r a c tTo investigate the effect of recurrent sediment resuspension-deposition events (RSRDEs) on bioavailability of polycyclic aromatic hydrocarbons (PAHs) in aquatic environments, a modified device was used to simulate three resuspension-deposition events with the sediment collected from the Yellow River. The results showed that the dissolved organic carbon (DOC)-water distribution coefficients of PAHs decreased with time during the first resuspension-deposition period. It indicates that some PAHs associated with organic carbon (OC) in suspended sediment (SPS) desorbed with the release of OC and became DOC-associated PAHs in the overlying water, then the PAHs desorbed from the DOC and became freely dissolved. After first 2-h suspension, only 1.90% of phenanthrene, 2.98% of pyrene, and 0.33% of chrysene in the overlying water came from pore-water; at least 61.6%, 89.6%, and 95.3% came from DOC-associated PAHs in SPS and the rests were released from the insoluble OC in SPS. The maximum desorption ratios in the original sediment were 20%, 12%, and 14% for phenanthrene, pyrene, and chrysene, respectively during the first resuspension-deposition event. The SPS concentration followed the sequence of the third > second > first resuspension event. This was because RSRDEs changed the SPS particle size and enhanced floc formation. There was no significant difference in the total dissolved PAH concentrations among the three resuspension events, while their freely dissolved concentrations followed the sequence of the third > second > first resuspension event. During deposition periods, more than half of the total/freely dissolved PAHs released during suspension still existed in the overlying water after 70-h deposition. This study suggests that the RSRDEs will increase the bioavailability of PAHs in aquatic environments, especially near the sediment-water interface, and the potential effects of PAHs during RSRDEs on fish/human in rivers and lakes should be considered in future management.

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“…The operation of the Three Gorges Reservoir (TGR) results in significant accumulations of both cohesive sediment and nutrients [ Fang and Wang , ; Huang et al ., ], which contribute to the formation of biofilms on particle surfaces [ Gerbersdorf et al ., ; Fang et al ., ]. A biofilm is a complex structure consisting of living microorganisms and their metabolic products known as extracellular polymeric substances (EPS) [ Flemming and Wingender , ; Gerbersdorf and Wieprecht , ].…”

Section: Introductionmentioning

confidence: 99%

Modeling sediment transport with an integrated view of the biofilm effects

Fang

Lai

Cheng

et al. 2017

Water Resources Research

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Most natural sediment is invariably covered by biofilms in reservoirs and lakes, which have significant influence on bed form dynamics and sediment transport, and also play a crucial role in natural river evolution, pollutant transport, and habitat changes. However, most models for sediment transport are based on experiments using clean sediments without biological materials. In this study, a three‐dimensional mathematical model of hydrodynamics and sediment transport is presented with a comprehensive consideration of the biofilm effects. The changes of the bed resistance mainly due to the different bed form dynamics of the biofilm‐coated sediment (biosediment), which affect the hydrodynamic characteristics, are considered. Moreover, the variations of parameters related to sediment transport after the biofilm growth are integrated, including the significant changes of the incipient velocity, settling velocity, reference concentration, and equilibrium bed load transport rate. The proposed model is applied to evaluate the effects of biofilms on the hydrodynamic characteristics and sediment transport in laboratory experiments. Results indicate that the mean velocity increases after the biofilm growth, and the turbulence intensity near the river bed decreases under the same flow condition. Meanwhile, biofilm inhibits sediment from moving independently. Thus, the moderate erosion is observed for biosediment resulting in smaller suspended sediment concentrations. The proposed model can reasonably reflect these sediment transport characteristics with biofilms, and the approach to integration of the biological impact could also be used in other modeling of sediment transport, which can be further applied to provide references for the integrated management of natural aqueous systems.

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Mobility of phosphorus induced by sediment resuspension in the Three Gorges Reservoir by flume experiment

Cited by 38 publications

References 23 publications

Analysis of biofilm bacterial communities under different shear stresses using size-fractionated sediment

Analysis of biofilm bacterial communities under different shear stresses using size-fractionated sediment

Effect of recurrent sediment resuspension-deposition events on bioavailability of polycyclic aromatic hydrocarbons in aquatic environments

Modeling sediment transport with an integrated view of the biofilm effects

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