Contaminant(CODCr)release from river bottom sediments under flow conditions
动态水流条件下河流底泥污染物(CODCr)释放研究

Comprehensive treatment and pollution prevention of pollutants in bottom sediments is an important problem in urban river rehabilitation projects. In this paper, the bottom sediment of Suzhou creek was selected as a test sample and the effect of sediment contaminants on upper water body quality was analyzed by means of water flume testing under different hydrodynamic conditions. The results show that the water depth and the flow velocity both contribute to the release rate of sediment contaminants. For a given depth, the release rate increases with velocity, while for a given water flow velocity the amount of bottom pollution released decreases with the water depth. Over time, the CODCr release rate slowed while the CODCr release intensity grew. The variation of the release intensity with time under the test conditions was obtained.