Theoretical sediment models range from simple steady-state models considering the sedimentation as a simple sinking process for elements, to models considering one or more element pools in the sediment and several processes taking part in cycling of the elements within the sediment and across the sediment-water interface. These processes can be biological such as mineralization and bioturbation, or chemical such as precipitation and che-mosorption, or physical such as sinking, resuspension, diffUsion, and mixing. The sediment pools can be distributed in a single sediment layer or in several layers connected by diffusional processes. A range of models for phosphorus in sediments are shown in Figure 1.
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