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Erosion characteristics and floc strength of Athabasca River cohesive sediments: towards managing sediment-related issues

  • SEDIMENTS, SEC 2 • PHYSICAL AND BIOGEOCHEMICAL PROCESSES • RESEARCH ARTICLE
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Abstract

Purpose

This research aims to investigate: (1) the evolutional sequence of erosion of cohesive sediments entering the Athabasca River, (2) the influence of consolidation/biostabilization time on bed sediment stability, and (3) the implication of these results on contaminant transport within the Athabasca River.

Materials and methods

A 5-m annular flume was used to generate bed shear to assess cohesive sediment dynamics for eroded beds with consolidation/biostabilization periods (CBs) of 1, 3, and 7 days. Additional laser particle sizing, image analysis, densitometry, and microbial analysis were employed to further the analysis with respect to bed erosion and eroded floc characteristics.

Results and discussion

The critical bed shear stress for erosion increased from 0.16 (1-day CB) to 0.26 Pa (7-day CB) with an inverse relationship observed for both suspended sediment concentration and erosion rate with respect to CBs. The 7-day CB yielded the largest eroded flocs that initially have high organic content but were quickly broken up with increasing shear. The strongest eroded floc population occurred for the 3-day CB. Eroded flocs were found to be of an open matrix with high water content and low density. Flocs contained a mixture of clay and silt particles, microbes, algae, diatoms, and secreted extracellular polymeric substances (EPS). Counts of bacteria were observed to decrease with CBs while an increase in the algal community is suggested with time.

Conclusions

Consolidation was believed to have limited effect on erosion while biostabilization was the main controlling factor. Increasing biostabilization with time resulted in a more stable surficial layer with a reduced erosion rate relative to less biostabilized beds. The highly biostabilized bed (7-day CB), however, yielded the largest flocs which broke up easily compared to those eroded from 1- and 3-day CBs. It is believed that the EPS produced by the sediment biological community is the main component of the bed and flocs that is responsible for the observed stability results.

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References

  • Amos CL, Droppo IG, Gomez EA, Murphy TP (2003) The stability of a remediated bed in Hamilton harbour, Lake Ontario, Canada. Sedimentol 50:149–168

    Article  CAS  Google Scholar 

  • Amos CL, Bergamasco A, Umgiesser G, Cappucci S, Cloutier D, DeNat L, Flindt M, Bonardi M, Cristante S (2004) The stability of tidal flats in Venice Lagoon—the results of in-situ measurements using two benthic, annular flumes. J Mar Sci 51:211–241

    Google Scholar 

  • Amos CL, Umgiesser G, Ferrarin C, Thompson CEL, Whitehouse RJS, Sutherland TF, Bergamasco A (2010) The erosion rates of cohesive sediments Venice lagoon, Italy. Cont Shelf Res 30:859–870

    Article  Google Scholar 

  • Berkhout N (1994) Manual “UHCM”, Ultra High Concentration Meter. Delft Hydraulics, Rotterdam

    Google Scholar 

  • Droppo IG (2004) Structural controls on floc strength and transport. Can J Civ Eng 31:569–578

    Article  Google Scholar 

  • Droppo IG (2009) Biofilm structure and bed stability of five contrasting freshwater sediments. Mar Fresh Wat Res 60:690–699

    Article  CAS  Google Scholar 

  • Droppo IG, Stone M (1994) In-channel surficial fine-grained sediment laminae (Part I): physical characteristics and formational processes. Hydrol Proc 8:101–111

    Article  Google Scholar 

  • Droppo IG, Amos CL (2001) The structure, stability and transformation of contaminated lacustrine surface fine-grain laminae. J Sed Res 71(5):718–727

    Article  Google Scholar 

  • Droppo IG, Leppard GG, Flannigan DT, Liss SN (1997) The freshwater floc: a functional relationship of water and organic and inorganic floc constituents affecting suspended sediment properties. Wat Air Soil Pollut 99:43–53

    CAS  Google Scholar 

  • Droppo IG, Lau YL, Mitchell C (2001) The effect of depositional history on contaminated bed sediment stability. Sci Tot Environ 266:7–13

    Article  CAS  Google Scholar 

  • Droppo IG, Ross N, Skafel M, Liss SN (2007) Biostabilization of cohesive sediment beds in a freshwater wave-dominated environment. Limnol Oceanogr 53(2):577–589

    Article  Google Scholar 

  • Eaton AD, Clesceri LS, Rice EW, Greenberg AE (2005) Standard methods for the examination of water and wastewater, 21st edn. American Public Health Association, American Water Works Association, Water Environment Federation, Baltimore

    Google Scholar 

  • Environment Canada (1994) Manual of analytical methods, v. 1. Major ions and nutrients. Environmental Conservation Service (ECD). Canadian Communications Group, Toronto

    Google Scholar 

  • Francois RJ (1987) Strength of aluminum hydroxide flocs. Wat Res 21:1023–1030

    Article  CAS  Google Scholar 

  • Gerbersdorf SU, Jancke T, Westrich B (2007) Sediment properties for assessing the erosion risk of contaminated riverine sites. J Soils Sediments 7(1):25–35

    Article  CAS  Google Scholar 

  • Gerbersdorf SU, Jancke T, Westrich B, Paterson DM (2008) Microbial stabilization of riverine sediments by extracellular polymeric substances. Geobiology 6:57–69

    CAS  Google Scholar 

  • Gerbersdorf SU, Bittner R, Lubarsky H, Manz W, Paterson DM (2009) Microbial assemblages as ecosystem engineers. J Soils Sediments 9:640–652

    Article  CAS  Google Scholar 

  • Ghosh U, Gillette JS, Luthy RG, Zare RN (2000) Microscale location, characterization, and association of polycyclic aromatic hydrocarbons on harbour sediment particles. Env Sci Tech 34:1729–1736

    Article  CAS  Google Scholar 

  • Hawley N (1982) Settling velocity distribution of natural aggregates. J Geophys Res 87(C12):9489–9498

    Article  Google Scholar 

  • Headley JV, Akre C, Conly FM, Peru KM, Dickson LC (2001) Preliminary characterization and source assessment of PAHs in tributary sediments of the Athabasca river, Canada. Environ Forensis 2:335–345

    Article  CAS  Google Scholar 

  • Jarvis P, Jefferson B, Gregory J, Parsons SA (2005) A review of floc strength and breakage. Wat Res 39:3121–3137

    Article  CAS  Google Scholar 

  • Krishnappan BG (1993) Rotating circular flume. J Hydraul Eng 119(6):758–767

    Article  Google Scholar 

  • Krishnappan BG (2000) Modelling cohesive sediment transport in rivers. In: Stone M (ed), The role of erosion and sediment transport in nutrient and contaminant transfer. Proceedings of the International Association for Hydrological Sciences, Waterloo, Ontario, Canada, IAHS Pub 263, pp 269–276

  • Krishnappan BG (2007) Recent advances in basic and applied research in cohesive sediment transport in aquatic systems. Can J Civ Eng 34:731–743

    Article  Google Scholar 

  • Krumbein WE, Paterson DM, Stal LJ (eds) (1994) Biostabilization of sediments. Verlag, Oldenburg, p 526

    Google Scholar 

  • Lambert CP, Walling DE (1988) Measurement of channel storage of suspended sediment in a gravel-bed river. Catena 15:65–80

    Article  Google Scholar 

  • Larkin PA (1978) Biometrics—a handbook of elementary statistical tests. University of British Columbia, Vancouver, British Columbia, Canada

  • Liao BQ, Allen DG, Leppard GG, Droppo IG, Liss SN (2002) Interparticle interactions affecting the stability of sludge flocs. J Colloid Interf Sci 249:372–380

    Article  CAS  Google Scholar 

  • Liss SN, Droppo IG, Flannigan D, Leppard GG (1996) Floc architecture in wastewater and natural riverine systems. Env Sci Tech 30(2):680–686

    Article  CAS  Google Scholar 

  • Lundkvist M, Grue M, Friend PL, Flindt MR (2007) The relative contributions of physical and microbiological factors to cohesive sediment stability. Contin Shelf Res 27(8):1143–1152

    Article  Google Scholar 

  • Maruya KA, Risebrough RB, Horne AJ (1996) Partitioning of polynuclear aromatic hydrocarbons between sediments from San Francisco Bay and their porewaters. Env Sci Tech 30:2942–2947

    Article  CAS  Google Scholar 

  • Milligan TG, Hill PS (1998) A laboratory assessment of the relative importance of turbulence, particle composition, and concentration in limiting maximal floc size and settling behavior. J Sea Res 39:227–241

    Article  Google Scholar 

  • Parker DS, Kaufman WJ, Jenkins D (1972) Floc breakup in turbulent flocculation processes. J Sanit Eng Div: Proc ASCE SA1:79–99

    Google Scholar 

  • Paterson DM (1997) Biological mediation of sediment erodibility: ecology and physical dynamics. In: Burt N, Parker R, Watts J (eds) Cohesive sediments. John Wiley, New York, pp 215–229

    Google Scholar 

  • Petersen O, Krishnappan BG (1994) Measurement and analysis of flow characteristics in a rotating circular flume. J Hydraul Res 32(4):483–494

    Article  Google Scholar 

  • Ravens TM, Gschwend PM (1999) Flume measurements of sediment erodibility in Boston harbor. J Hydraul Eng 125(10):998–1005

    Article  Google Scholar 

  • Salhani N, Uelker-Deffur A (1998) Improved quantification of aggregated bacteria by combined enzymatic and mechanical treatment of flocs and biofilms from a rotating drum bioreactor. Wat Res 32:1287–1295

    Article  CAS  Google Scholar 

  • Smith DJ, Underwood JC (1998) Exopolymer production by intertidal epipelic diatoms. Limnol Oceanogr 43(7):1578–1591

    Article  CAS  Google Scholar 

  • Stone M, Krishnappan BG, Emelko MB (2008) The effect of bed age and shear stress on the particle morphology of eroded cohesive river sediment in an annular flume. Wat Res 42:4179–4187

    Article  CAS  Google Scholar 

  • Sutherland TF, Amos CL, Grant J (1998) The effect of buoyant biofilms on the erodibility of sublittoral sediments of a temperate microtidal estuary. Limnol Oceanogr 43(2):225–235

    Article  CAS  Google Scholar 

  • Teisson C, Ockenden M, Le Hir P, Kranenburg C, Hamm L (1993) Cohesive sediment transport processes. Coastal Eng 21:129–162

    Article  Google Scholar 

  • Yallop ML, Paterson DM, Wellsbury P (2000) Interrelationships between rates of microbial production, exopolymer production, microbial biomass and sediment stability in biofilms of intertidal sediments. Microb Ecol 39:116–127

    Article  CAS  Google Scholar 

Download references

Acknowledgments

JG-A thanks the CONACYT Mexican funding agency for the economic support during a sabbatical at Environment Canada. We also thank the staff of Alberta Sustainable Resource Development at Fort McMurray for their support with the sampling equipment and shipping of samples.

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Authors and Affiliations

  1. Centro Interamericano de Recursos del Agua, FI-UAEM, Toluca, Mexico

    Juan Garcia-Aragon

  2. Environment Canada, CCIW-Burlington, Burlington, ON, L7R 4A6, Canada

    Ian G. Droppo, B. G. Krishnappan, Brian Trapp & Christina Jaskot

Authors
  1. Juan Garcia-Aragon
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  2. Ian G. Droppo
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  3. B. G. Krishnappan
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  4. Brian Trapp
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  5. Christina Jaskot
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Corresponding author

Correspondence to Ian G. Droppo.

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Responsible editor: Sabine Ulrike Gerbersdorf

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Garcia-Aragon, J., Droppo, I.G., Krishnappan, B.G. et al. Erosion characteristics and floc strength of Athabasca River cohesive sediments: towards managing sediment-related issues. J Soils Sediments 11, 679–689 (2011). https://doi.org/10.1007/s11368-011-0345-4

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  • DOI: https://doi.org/10.1007/s11368-011-0345-4

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