【摘要】 本文从两方面论述了底质重金属对海水污染问题:（1）从五里河口经潮间带至海湾剖面线上,沉积物中铅、锌、镉地球化学相的分布规律及垂直方向的变化,并把沉积物间隙水重金属形态与沉积物重金属地球化学相联系起来分析铅、锌、镉被释放出来污染上覆海水的可能性;（2）阐述了间隙水水文地质条件,推导了水动力扩散数学模型,用实测资料求出水动力扩散系数 D_L=3.72×10^-2cm²/sec,求得扩散迁移通量:J_pb=0.0421mg/m²·h,Jzn=0.7787mg/m²·h,Jcd=0.799mg/m²·h,得出锦州湾潮间带是不可忽视的海水“二次污染源”的结论。更多还原

【Abstract】 Effects of heavy matals in sediment on overlying seawater were discussed in two respects:（1）The potentiality of polluting overlying seawater by Pb,Zn and Cd from the sediment on tidal flat along the profiles from the Wu-Li River estuary to low tideline was discussed in accordance with the distribution regulari- ty and vertical changes of their geochemical phases in sediment and the existing pattern of the respective heavy metals in sediment pore water;（2）The hydrologi- cal conditions of sediment pore water were discussed and a mathematical model was derived and through actual measurement a dispersion coefficient D_L=3.72× 10^-2cm²/sec.was obtained.On the basis of the mathematical model,the derived dispersion fluxes are J_Pb=0.0421mg/m²·h,J_Zn=0.7787mg/m²·h and J_Cd=0.799mg/m²· h.Therefore,it was shown that the contaminated sediment on tidal flat in Jinzhou Bay is a nonnegligible secondary pollution sources for overlying seawater.更多还原