Deposition and Transportation Characterisrics of Organic Matter in Brackish Water Region

Abstract

Observation and laboratory experiments were performed to understand the re-suspension mechanism of organic mud under salinity variation at an estuarine bed. The organic mud is transported upstream under the separation into different types of organic matter. The re-suspension flux of organic mud depends on not only the shear stresses and organic properties but also surface water salinity. The re-suspension flux of organic mud was separated into fresh water and saline water components. The re-suspension flux also depends on the content rate of POCs originated in oil and fat/primary production. The trend of turbidity in the Tenma River can be almost explained with the re-suspension formula of organic mud considering the salinity effect.