The Centre For Water Research

Title: A generic, process-based model of microbial pollution in aquatic systems

Authored by: Hipsey, M.R., Antenucci, J.P., Brookes, J.D.

Abstract:

Based on a comprehensive synthesis of data available within the literature, a new process-based model of microbial pollution is presented, which is applicable for surface and coastal waters. The model is based on a generic set of parameterisations that describe the dynamics of most protozoan, bacterial and viral organisms of interest, including pathogens and microbial indicator organisms. The parameterisations dynamically account for the effects of temperature, salinity, pH, dissolved oxygen, sunlight, nutrients and turbidity on the growth and mortality of enteric organisms. Parameters for a range of organisms are also presented which are based on collation of literature data. The model has been implemented within the aquatic ecology model, CAEDYM, which can couple to 1, 2, or 3 dimensional hydrodynamic models.

Without adjustment of the literature derived parameter values, the 3D model is validated against data from three freshwater systems that differ in their climatic zone, trophic status and operation. The simulations highlight the spatial and temporal variability that may be encountered by operators. Additionally, large differences between species originate from variable rates of growth, mortality and sedimentation and it is emphasized that the use of surrogates for quantifying risk is problematic. The model can be used to help design targeted monitoring programs, examine differences between species, and to support real-time decision-making. Areas where insufficient understanding and data exist are discussed.

Reference: Hipsey, M.R., Antenucci, J.P., Brookes, J.D., 2008, A generic, process-based model of microbial pollution in aquatic systems, to be submitted to Water Research, , 44, W07408, doi:10.1029/2007WR006395

Keywords: microbial pollution; ELCOM-CAEDYM water quality model; pathogens; faecal indicators; coliforms