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Sediment Equilibrium and Diffusive Fluxes in Relation to Phosphorus Dynamics in the Turbid Minnesota River

Abstract : Much is known regarding the importance of surface and subsurface runoff from agricultural watersheds in the regulation of soluble phosphorus (P) concentration in large river systems. However, in-stream processes such as equilibrium P flux from suspended sediment and diffusive P flux from deposited sediment stored in river channels may also play a role in soluble P control. Ranges in equilibrium partitioning between aqueous and exchangeable particulate P pools associated with suspended and deposited sediment are needed in order to estimate mass transfer coefficients (kd; L kg(-1) and ke; m d(-1) for watershed and receiving water Nutrient Sub-Module (NSM) development within the System-Wide Water Resources Program (SWWRP) of the U.S. Army Engineer Research and Development Center (ERDC). The objectives of this research are: (1) to examine sediment equilibrium and diffusive P fluxes and mass transfer coefficients for suspended and deposited sediment loads, and (2) to place these fluxes within the context of phosphorus dynamics and regulation of soluble P in the Minnesota River.