Abstract
We carried out water quality monitoring under the ice in brackish lake with salt-fresh water boundary. Continuous observation at constant elevations, vertical distribution observation and water sampling analysis at regular intervals were carried out. In freezing season, salinity boundary was seen broken and spreads upward due to water temperature formed reversal distribution. However, dissolved oxygen (DO) was maintained distribution with boundary. Moreover, turbidity distribution had a maximum value at an elevation of salinity 11PSU. It was cleared that elevation of turbidity peak and elevation of DO boundary ware well agreed. As a result of water sampling, water quality such as nutrient salts was revealed different behavior depend on DO boundary and not halocline. Result of comparison with flux of elution and flux of passing through DO boundary, it assumed that nutrients is stored in anaerobic layer.
