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Numerical modelling of sediment-bacteria interaction processes in surface waters

The paper reports a novel approach to modelling coliform bacteria fluxes in estuarine environments, where total flux is first calculated and then divided through a partition coefficient into the free living and sediment attached bacteria. In this paper the conceptual model is verified against analytical and idealised test cases and in related papers against field data for the Severn Estuary. In particular, the model has been applied to study the effects of a Severn Barrage and reduced suspended fluxes, showing that a barrage would lead to reduced bacterial concentrations (as presented to the DECC 2008 review studies, http://webarchive.nationalarchives.gov.uk/20110523172013/http://www.decc.gov.uk/en/content/cms/what_we_do/uk_supply/energy_mix/renewable/severn_tidal_power/severn_tidal_power.aspx,Case Study 1).