Calculation of Loss Amount from Southeast Bay to Southwest Bay

Applying investigation data about Pb in Jiaozhou Bay in August, 1992 and according to horizontal matter content change model and the vertical matter content change model proposed by the authors, the horizontal loss amount, vertical diluted amount and vertical sediment amount of Pb content in the surface and bottom layers from southeast bay to southwest bay are calculated. What's more, the model diagram of vertical change and horizontal change of Pb content is designed. The calculation results show that in August in 1992, the absolutely loss amount of Pb content in the bottom layer was 11.03μg/L, and the relative loss amount of Pb content in the bottom layer was 58.42%. Meanwhile, the absolutely increase amount of Pb content in the surface layer was 4.60μg/L, and the relatively increase amount of Pb content in the surface layer was 28.93%. In the southeast bay, the relatively vertical sediment amount of Pb content in the surface and bottom layers was 40.14%, and the absolutely vertical sediment amount of Pb content in the surface and bottom layers was 7.58μg/L. Similarly, in the southwest bay, Pb content in the surface layer and bottom layer had an absolutely vertical diluted amount of 8.05μg/L with a relatively vertical diluted amount of 50.62%. In August, the main sea current carried Pb content through the surface nearshore waters around the bay where many sources of Pb content existed. The law of horizontal loss amount shows that: when Pb content migrated horizontally in the surface layer, Pb content did not lose but increased. However, when Pb content migrated horizontally in the bottom layer, a lot of Pb content was lost due to a long distance. Moreover, the law of the vertical loss amount revealed that Pb content was transported by the main sea current and was relatively high in its vertical migration process. As a result, the vertical sediment amount 40.14% of Pb content in surface and bottom layers was changed to the vertical diluted amount 50.62% of Pb content in the surface and bottom layers when the main sea current flowed from southeast bay waters to southwest bay waters.