Modeling for horizontal and vertical migration of Pb in marine bay

Abstract

This paper quantified the horizontal and vertical migration processes of Plumbum (Pb) in Jiaozhou Bay in 1989. Results showed that the horizontal absolute loss amounts of Pb were1.07-8.70 μg L-1, and the horizontal relative loss amounts were 9.70%-57.35%. The vertical absolute dilution amounts of Pb were 1.95-8.70 μg L-1, and the horizontal relative dilution amounts were 19.30%-57.35%. The vertical absolute accumulation amounts of Pb were 1.07 μg L-1, and the vertical relative accumulation amounts were 9.70%. During the migration processes, Pb contents in both surface and bottom waters were decreasing in a certain degree during the horizontal migration process. The horizontal loss amounts were very 52.78%-57.35% in July, yet was very low in April. Meanwhile, the horizontal dilution amounts were also relative high as 47.60%-52.86%. In April, Pb was mainly sourced from river runoff, and there was high sedimentation process in the bay center. In July, Pb was mainly sourced from river runoff and atmosphere deposition, and there were high sedimentation processes in the bay center and the bay mouth.