Abstract: In an attempt to study the three-phase transformation of heavy metal cadmium (Cr) in Jinshan Lake under different hydrodynamic disturbances, the transformation of Cr in Jinshan Lake during a diurnal tide is simulated using an annular sink which simulates lake water flow coupled with hydroenvironment mathematical model. Results show that under medium and high disturbances, the intensity of incipient suspension grows with the increase of water depth. At a given water depth, as the intensity of disturbance grows, deposited Cr and dissolved Cr both present a decreasing trend, while suspended Cr increases. Under low disturbance, however, the rule of Cr transformation among three phases is not obvious, with deposited Cr staying stable. In addition, in different partitions of lake, the concentration of Cr of different phases presents two peaks and two valleys; in holistic sense, the change trend of deposited Cr is similar to that of dissolved Cr, opposite to that of suspended Cr.

Key words: river-connected lake, heavy metal cadmium, transformation of three phases, tidal effect, sediment, Jinshan Lake