Abstract
Abstract
Bed stability is directly related to sediment resuspension and internal pollutant release, which provide an important physical basis for natural water internal pollution control. Contaminated sediment will release accumulated pollutants into the overlying water because of the instability of the riverbed and become a potential source of internal pollution. In this paper, the influence of contaminated sediment backfill technology (CSBT), i.e., the calcination of dredged sediment into ceramsite after dewatering and pollutant fixation, followed by backfilling to the dredged area, on bed stability was investigated through flume experiments. Acoustic Doppler velocimetry (ADV) was used to measure the hydrodynamic characteristics in the flume. The results show that CSBT can increase bed stability and make the water-sediment interface clear. In addition, the porosity increased after backfilling ceramsite, increasing the effective expansion of oxygen. This study provides a new idea for river and lake ecological management and environmental restoration.