Dynamic Migration Process of Cd to the Bay Center

Based on the horizontal and vertical matter content changing models proposed by the author himself, this article calculates the horizontal loss amount, vertical disputed amount and vertical sediment amount, and determines the block diagram of horizontal and vertical Cd content changing model, applying the investigation matters about the Cd content of Jiaozhou Bay in May, August, and October, 1992. The calculation results show that the variation range of absolutely horizontal loss amount of Cd content in the bottom layer is 0.63-0.82μg/L and the variation range of relatively horizontal loss amount is 68.90-87.50% in May and October. In August, the absolutely horizontal increase amount and relatively horizontal increase amount of Cd content in the bottom layer are 0.94 μg/L and 87.03%, respectively. The Cd content in the surface and bottom layer of southeast waters in August all have the absolutely vertical disputed amount 0.61μg/L and relatively vertical disputed amount 81.33%. The Cd content in the surface and bottom layer of southeast waters in May and October have the absolutely vertical sediment amount within 0.49-0.68μg/L and relatively vertical sediment amount within 57.14-68.05%. In the center of the bay, the Cd content in the surface and bottom layer in August have the absolutely vertical sediment amount 0.96 μg/L and relatively vertical sediment amount 88.88%. In May and October, the absolutely vertical disputed amount and relatively vertical disputed amount of Cd content in the surface and bottom layer of bay center are 0.35-0.52μg/L and 58.42-79.54%, respectively.