Modelling of flocculation and transport of cohesive sediment from an on-stream stormwater detention pond

Krishnappan, B. G.; Maršálek, Jiří

doi:10.1016/s0043-1354(02)00087-8

Cited by 63 publications

(38 citation statements)

References 12 publications

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“…The relationship between floc size and settling velocity of Elbow River cohesive sediment is consistent with earlier studies (Watt and Marsalek, 1994;Krishnappan and Marsalek, 2002). Floc size plays a dual role in settling velocity based on floc density as a function of increased porosity (Droppo et al, 2000).…”

Section: Density and Settling Velocitysupporting

confidence: 89%

“…The settling velocity of cohesive sediment from the Elbow River (refer to Figure 3.9) was consistent with the results of these earlier studies, reaching a maximum of 0.37mm/s at a floc size of 50µm before decreasing to 0.07mm/s with increasing floc size (128µm) coupled to decreasing floc density. The results of the current study demonstrated that the inverse relationship between floc size and settling velocity for larger flocs was consistent with cohesive sediments collected from various sources (stormwater management ponds and natural rivers) and physical environments (Watt and Marsalek, 1994;Krishnappan and Marsalek, 2002;Krishnappan, 2007).…”

Section: Density and Settling Velocitysupporting

confidence: 81%

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The effect of coarse gravel on cohesive sediment entrapment in an annular flume

Glasbergen¹,

Stone²,

Krishnappan³

et al. 2015

Proc. IAHS

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Abstract. While cohesive sediment generally represents a small fraction (<0.5%) of the total sediment mass stored in gravel-bed rivers, it can strongly influence physical and biogeochemical processes in the hyporheic zone and alter aquatic habitat. This research was conducted to examine mechanisms governing the interaction of cohesive sediments with gravel beds in the Elbow River, Alberta, Canada. A series of erosion and deposition experiments with and without a gravel bed were conducted in a 5-m diameter annular flume. The critical shear stress for deposition and erosion of cohesive sediment without gravel was 0.115 Pa and 0.212 Pa, respectively. In experiments with a gravel bed, cohesive sediment moved from the water column into the gravel bed via the coupling of surface and pore water flow. Once in the gravel bed, cohesive sediments were not mobilized under the maximum applied shear stresses (1.11 Pa) used in the experiment. The gravel bed had an entrapment coefficient (ratio between the entrapment flux and the settling flux) of 0.2. Accordingly, when flow conditions are sufficient to produce a shear stress that will mobilize the armour layer of the gravel bed (>16 Pa), cohesive materials trapped within the gravel bed will be entrained and transported into the Glenmore Reservoir, where sediment-associated nutrients may pose treatment challenges to the drinking water supply.

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Section: Density and Settling Velocitysupporting

confidence: 89%

Section: Density and Settling Velocitysupporting

confidence: 81%

The effect of coarse gravel on cohesive sediment entrapment in an annular flume

Glasbergen¹,

Stone²,

Krishnappan³

et al. 2015

Proc. IAHS

View full text Add to dashboard Cite

show abstract

“…Nevertheless, to perform efficient analysis, global characteristics such as structure, evolution through time and the effects of moisture should also be taken into account. Some characterizations of the grain size of urban materials and their ability to flocculate and aggregated along their transport from street to the sewer system (Droppo et al, 2002) and in the sewer system (Krishnappan and Marsalek, 2002;Pétavy et al, 2009) have already been performed. Some studies have already emphasized water behavior in relation to contaminated material/soil.…”

Section: Discussionmentioning

confidence: 99%

Study of the aggregation of the surface layer of Technosols from stormwater infiltration basins using grain size analyses with laser diffractometry

et al. 2009

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“…Then the cylinder was covered with a lid and kept under a static condition for 7 days. During sediment suspension, the perforated grids were oscillated with vertical amplitude of 3.2 cm (between 5.0 and 8.2 cm above from the sediment surface), and they were driven by the speed motor with 150 rpm, corresponding to 6.4 N/m 2 , which was in the range of erosion shear stress (0.2-75 N/m 2 ) found in natural rivers (Babaeyan-Koopaei et al, 2002;Keevil et al, 2015;Kimiaghalam et al, 2015;Krishnappan and Marsalek, 2002;Reungoat et al, 2014). Furthermore, the experimental parameters including water depth and the sediment thickness used in this study are similar to other simulation experiments Schneider et al, 2007).…”

Section: Sediment Resuspension Experimentsmentioning

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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Modelling of flocculation and transport of cohesive sediment from an on-stream stormwater detention pond

Cited by 63 publications

References 12 publications

The effect of coarse gravel on cohesive sediment entrapment in an annular flume

The effect of coarse gravel on cohesive sediment entrapment in an annular flume

Study of the aggregation of the surface layer of Technosols from stormwater infiltration basins using grain size analyses with laser diffractometry

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

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