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Estuaries provide an important role in filtering and transforming nutrients transported from catchment areas into marine environments. The dynamic interactions between biophysical processes operating within these systems will influence the vulnerability of an estuary to human induced change. Process-based aquatic ecosystem models have been applied to coastal estuaries to understand how these systems respond to anthropogenic nutrient enrichment. These models account for system-level responses that are specific to estuarine environments including the sensitivity of benthic sediments and associated biota to eutrophication and the role of substratum condition in altering nutrient flux. However, there is a need to explicitly recognise the spatial heterogeneity of benthic sediments associated with the underlying geomorphology in these models. The intent of this paper is to determine how the incorporation of estuarine geomorphic zonation within an aquatic ecosystem model affects estimates of nutrient flux associated with spatial variation in depositional environment. GIS is coupled with a simple aquatic ecosystem model for a tide-dominated drowned river estuary to examine the influence of geomorphic setting.

Incorporating geomorphic zonation in nutrient models for coastal-estuarine environments: coupling GIS and aquatic ecosystem modeling