Abstract
To design a model for the settling of Suspended Organic Matter (SOM), the decomposition rate of organic matter, and variations in the particle size and the density of SOM were studied in the course of decomposition. The decomposition rate of SOM is estimated using the analyzed results of SOM properties (i.e. particle density, particle size, IL, and resolvability). The Multi-G Model, which formulates the decomposition of organic matter derived from phytoplankton, was chosen to calculate the decomposition rate of SOM. The parameters of each fraction in the Multi-G Model were estimated on the basis of the correlation between the deposition age and the decomposition rate of SOM. In addition, it has become possible to determine the mean decomposition rate of organic matter using the C/N ratio. Temporal variations of the particle size and the particle density of SOM during decomposition were estimated from the C/N ratio, and approximate expressions for the variations were proposed. Based on these results, it is possible to calculate the settling velocity of SOM in considering the variation of its properties due to decomposition
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