Abstract
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In the management of surface water quality, sediment has been regarded as a water pollution source and dealt with through pollution source management methods, such as dredging projects. However, to preserve not only the benthic organisms living in sediment but also the ecological health of water, se...

In the management of surface water quality, sediment has been regarded as a water pollution source and dealt with through pollution source management methods, such as dredging projects. However, to preserve not only the benthic organisms living in sediment but also the ecological health of water, sediment should be recognized as an independent medium which constitutes basins, and the ex post facto treatment-oriented, cross-sectional purpose of surface water quality management should be shifted to ecological purposes, including the protection of benthic organisms. Proper sediment management is closely related to the shapes of basins. In the case of lakes such as Saemanguem Lake in which desalination is progressing in hydrologically stable states after the construction of banks for land reclamation projects, water systems cannot be easily mixed. Salt layers are formed by continuous inflows of freshwater, and thus, the floating matter sediment in which pollution sources were concentrated at upstream points is easily deposited. In addition, the combination of water stagnation and the elution of nutrient salts in the sediment creates problems, such as the depletion of dissolved oxygen and the mass propagation of algae. To solve these problems, appropriate solutions should be developed through the long-term monitoring of underwater pollutants and the evaluation of pollution. In particular, devising monitoring methods not affected by rapidly changing internal environments are difficult when monitoring is necessary during internal construction. Therefore, effective monitoring methods based on water environment data and statistical analysis were developed. As well, for sediment evaluation, evaluation methods that can use monitoring data are presented.

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