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According to the survey data on Pb in Jiaozhou Bay in May and August 1991 and the horizontal and vertical matter content change model put out by the author, the horizontal loss, vertical dilution and vertical accumulation of Pb surface content were calculated. And a model block diagram of the horizontal and vertical changes in Pb content was determined. Therefore, in May and August, the absolute loss amount of Pb content in the surface layer and the bottom layer varies from 1.12 to 13.81 $\mu$ g/L, and the relative loss amount of the surface layer and the bottom layer Pb content ranges from 16.74 to 73.31%. The bottom content of Pb table has an absolute vertical dilution of 0.83-9.31 $\mu$g/L, and its relative vertical dilution is 4.64-58.18%. The content of the bottom layer of the Pb table has an absolute vertical accumulation of 1.30 $\mu$g / L, and its relative vertical accumulation amount is 23.33%. In May and August, in the waters from the northern part of the Bay mouth through the bay to the center of the bay, the horizontal loss of Pb surface layer content was relatively high, reaching 43.61-73.31%, and the horizontal loss of Pb bottom layer content was relatively low, reaching 16.74-37.47%. The variation of the amount of horizontal loss reveals that the Pb content only passes through the waters in the bay. In May and August, the waters from the northern part of the mouth of the bay through the bay to the center of the bay caused a relatively high level of surface loss and a relatively low level of bottom loss. The amount of surface level loss of Pb content is relatively high, and the amount of bottom level loss of Pb content is relatively low. The amount of surface level loss of Pb content is relatively high, and the amount of bottom level loss of Pb content is relatively low. The variation of the vertical loss amount reveals that when the surface Pb content of the water body changes from 16.00 $\mu$g/L to 4.27 $\mu$g/L, the vertical dilution amount of the bottom layer content of the Pb table changes to 28.33%. When the surface Pb content of the water changed from 31.66 $\mu$g/L to 17.85 $\mu$g/L, the vertical dilution of the Pb surface underlayer content changed from 14.02% to 4.64%.Humans need a large number of ships for maritime transport, and seawater containing lead (Pb) appears at the ship's dock. In this way, humans have continued Pb emissions to the marine environment, causing Pb pollution in the waters around the ship's wharf. As a result, Pb is brought to the surface layer of the seawater, and during the vertical migration process, the water is passed from the surface layer to the seabed [1–6]. Therefore, using the horizontal substance content change model and the vertical matter content change model proposed by the author, the horizontal migration process and vertical sedimentation process of Pb in Jiaozhou Bay waters were demonstrated by using the survey data on Pb content in Jiaozhou Bay in May and August 1991. The pollution process and pollution degree of Pb from water transport from ship docks are described, which provides a scientific basis for the study of vertical sedimentation and horizontal migration of Pb in the surface and bottom waters. |
