Definition and formula of substance content change in marine bay and the application

Abstract

Abstract. We analyzed the substance content change in marine based on water exchange, and provided definitions and formulas for horizontal loss amount, vertical dilution amount and vertical sedimentation amount. A case study in analysis the change of Pb contents in Jiaozhou Bay was provided to exhibit the application of these definitions and formulas. Results showed that the vertical variation and model of Pb contents could be revealed by means of the definitions and formulas. The horizontal loss amount of Pb indicated the Pb was very difficult to be imported from the open sea to the bay via the bay channel. The vertical dilution and sedimentation loss amount of Pb indicated that Pb was diluted greatly in the bay mouth due to the marine current, and the sedimentation rate was relative high in the open waters outside the bay mouth.