Modeling of Faecal Contamination in Water from Catchment to Shellfish Growing Area

Other literature type English OPEN
Bougeard, Morgane ; Le Saux, Jean-claude ; Perenne, Nicolas ; Le Guyader, Soizick ; Pommepuy, Monique (2009)
  • Publisher: ICMSS09 – Nantes, France – June 2009
  • Subject: SWAT | Catchment | Shellfish | Modeling | E. coli | Estuary | MARS

During rainstorms, watersheds can introduce large amounts of faecal pollution into the rivers and sea, leading to shellfish contamination. In this study, we assessed Escherichia coli fluxes from a catchment, and their impact on estuarine water quality, using two assembled models. For the catchment, the agro-hydrological model SWAT was implemented integrating land uses, soil, topography, rainfall and other climatic data on Daoulas watershed (France). Initially, the SWAT model was calibrated and validated for river flow rates, and results were found satisfactory. Subsequently, different faecal contamination sources were integrated into the model: point sources (WWTP discharges into rivers) and non-point sources (manure spreading on fields). During rainfall events, the major source of contamination was manure spreading, due to the movement of faecal bacteria from fields to streams. For the estuary, the hydrodynamic model MARS-2D was set up, which takes into account realistic wind and tide values. E. coli concentrations in water were then calculated, and shellfish contamination derived using different values of bioaccumulation ratio. Results indicated a strong relationship between simulated and measured levels of shellfish contamination. To conclude, this application demonstrates the interest of using models to assess coastal contamination.
  • References (17)
    17 references, page 1 of 2

    Aitken, M., Merrilees, D.W. and Duncan, A. (2001) Impact of agricultural practices and catchment characteristics on Ayrshire bathing waters, p. 66, Scottish Executive Central Research Unit, Environment Division, SAC, Auchincruive.

    Arnold, J.G., Srinivasan, R., Muttiah, R.S. and Williams, J.R. (1998) Large Area Hydrologic Modeling and Assessment Part I : Model Development. Journal of the American water resources association 34(1), 73-89.

    Baffaut, C. and Benson, V.W. (2003) A bacteria TMDL for shoal creek using swat modeling and DNA source tracking, pp. 35-40, ASAE Proceedings, Albuquerque, NM.

    Benham, B.L., Baffaut, C., Zeckoski, R.W., Mankin, K.R., Pachepsky, Y.A., Sadeghi, A.M., Brannan, K.M., Soupir, M.L. and Habersack, M.J. (2006) Modeling bacteria fate and transport in watersheds to support TMDLs. American Society of Agricultural and Biological Engineers 49(4), 987-1002.

    Bougeard, M., Le Saux, J.C., Jouan, M., Durand, G. and Pommepuy, M. (2010) Modeling and evaluation of compliance to water quality regulations in bathing areas on the Daoulas catchment and estuary (France). Water Science & Technology In press.

    Burkhardt, W. and Calci, K.R. (2000) Selective accumulation may account for shellfish-associated viral illness. Appl. Environ. Microbiol. 66(4), 1375-1378.

    Crowther, J., Kay, D. and Wyer, M. (2002) Faecal-indicator concentrations in waters draining lowland pastoral catchments in the UK: Relationships with land use and farming practices. Water Research 36, 1725-1734.

    Davies-Colley, R.J. and Lydiard, N.E. (2008) Storm-flow -dominated loads of faecal pollution from an intensively dairy-farmed catchment. Water Science & Technology 57(10), 1519-1523.

    Fraser R. H., Barten P.K. and Pinney D.A. (1998) Predicting stream pathogen loading from livestock using Geographical Information System-Based Delivery model. J. Env. Qual. 27, 935- 945.

    Kay, D., Wyer, M., Crowther, J., Stapleton, C., Bradford, M., McDonald, A., Greaves, J., Francis, C. and Watkins, J. (2005) Predicting faecal indicator fluxes using digital land use data in the UK's sentinel Water Framework Directive catchment: The Ribble study. Water Research 39(16), 3967-3981.

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