关键词: 底泥, 重金属污染, 河道清淤, 生态风险评价, 车陂涌

Abstract: Properly disposing the sediment with exceeded heavy metal pollution is the focus of channel dredging. Taking Chebeichong channel dredging project as an example, the pollution characteristics of sediment at different positions in the dredging section were analyzed by in-situ and chemical testing. The potential ecological risk assessment of sediment pollution was analyzed by potential ecological risk index method. The results showed that the low risks accounted for 31.71%, the medium risks accounted for 29.27%, the high risks accounted for 2.44%, and the extremely high risks accounted for 36.59%, indicating that most of the sediment had to be treated. Nemerow comprehensive pollution index method was used to evaluate the suitability of sediment as soil for agricultural land. 73.2% of sample points were clean, 9.8% were clean, 9.8% were slightly polluted, and 7.2% were moderately and severely polluted, indicating that most sediment could be used as farmland soil. Finally, issues that should be noted were raised to provide scientific basis for the water environment management of Chebeichong River.

Key words: heavy metals pollution, sediments, channel dredging, risk assessment, distribution characteristics, Chebeichong River