Abstract
The content and calibration of the comprehensive generic 3D eutrophication model ECO for water and sediment quality is presented. Based on a computational grid for water and sediment, ECO is used as a tool for water quality management to simulate concentrations and mass fluxes of nutrients (N, P, Si), phytoplankton species, detrital organic matter, electron acceptors and related substances. ECO combines integral simulation of water and sediment quality with sediment diagenesis and closed mass balances. Its advanced process formulations for substances in the water column and the bed sediment were developed to allow for a much more dynamic calculation of the sediment-water exchange fluxes of nutrients as resulting from steep concentration gradients across the sediment-water interface than is possible with other eutrophication models. ECO is to more accurately calculate the accumulation of organic matter and nutrients in the sediment, and to allow for more accurate prediction of phytoplankton biomass and water quality in response to mitigative measures such as nutrient load reduction. ECO was calibrated for shallow Lake Veluwe (The Netherlands). Due to restoration measures this lake underwent a transition from hypertrophic conditions to moderately eutrophic conditions, leading to the extensive colonization by submerged macrophytes. ECO reproduces observed water quality well for the transition period of ten years. The values of its process coefficients are in line with ranges derived from literature. ECO’s calculation results underline the importance of redox processes and phosphate speciation for the nutrient return fluxes. Among other things, the results suggest that authigenic formation of a stable apatite-like mineral in the sediment can contribute significantly to oligotrophication of a lake after a phosphorus load reduction.
Highlights
Eutrophication models tend to focus on processes in the water column
We developed its advanced process formulations for substances in the water column and the bed sediment to allow for a much more dynamic calculation of the sediment-water exchange fluxes of nutrients (N, P, Si) as resulting from steep concentration gradients across the sediment-water interface than is possible with other eutrophication models, including its predecessor model DBS [25,26]
ECO dynamically simulates a set of substances and processes on a computational grid that is composed of a water grid and a sediment grid having the same horizontal resolution, allowing for a much finer vertical resolution than DBS [25] and a spatial detailedness that is innovative for eutrophication models
Summary
Eutrophication models tend to focus on processes in the water column. The benthic-pelagic coupling and processes in the sediment have been neglected or very much simplified in most models [1,2,3,4,5,6,7,8]. We developed its advanced process formulations for substances in the water column and the bed sediment to allow for a much more dynamic calculation of the sediment-water exchange fluxes of nutrients (N, P, Si) as resulting from steep concentration gradients across the sediment-water interface than is possible with other eutrophication models, including its predecessor model DBS [25,26]. ECO dynamically simulates a set of substances and processes on a computational grid that is composed of a water grid and a sediment grid having the same horizontal resolution, allowing for a much finer vertical resolution than DBS [25] and a spatial detailedness that is innovative for eutrophication models. Facc,j ~1:0 kd,j ~kd,j,minzfnutj à (kd,j,max{kd,j,min) fnutj ~MIN (ONj =OCj {an,j,min) , (OPj =OCj {ap,j,min) an,j,max {an,j,min ap,j,max {ap,j,min conox,j ~(fcp,j zfcd,j ) à minox,j =facx,j foc fo0c sumf foc DO DOzKsoc à w
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