Abstract
Based on the survey data of the waters of Jiaozhou Bay in May, August and October 1992, the change of Pb content and its deposition process in the surface and bottom waters of Jiaozhou Bay were studied. According to the definition and model of Dongfang Yang’s content changing degree, the variation of Pb content at surface and bottom and of Pb content transported by main sea current formed a peak line in the southeast waters of Jiaozhou Bay. The Pb content on the surface reached its peak in August. From May to August, Dongfang Yang’s content changing degree was 79.84°. However, from August to October, it was -85.29°. Specifically, in surface water, Dongfang Yang’s content changing degree from May to August was 62.48°. From August to October, Dongfang Yang’s content changing degree was -39.00°. In the bottom water, Dongfang Yang’s content changing degree from May to August was 70.41°. From August to October, Dongfang Yang’s content changing degree was -80.03°. It indicates that the change of Pb content in surface nearshore waters passed through by the main sea current was determined by the change of Pb content transported by the current. The change of Pb content in surface seawater through the change of ocean currents increases or decreases the increase or decrease of Pb content in surface water —The Pb content of surface water increased or decreased with the increase or decrease of Pb content transported by main sea currents. The Pb content temporal variation in the surface and bottom of the southeastern waters of Jiaozhou Bay from May to October reveals the Pb content settling law: With the increase of Pb content in surface water, the Pb content in bottom water rose faster than that in surface water. When the Pb content in surface water decreased, the Pb content in bottom water decreased much faster than that in surface water. Therefore, the change mechanism of surface and bottom water caused by source transport is proposed with the corresponding model block diagram and changing degree model of Pb content transported by ocean currents.
Highlights
The main sea current entered Jiaozhou Bay through the bay mouth and surrounded the coastal waters with high lead (Pb) content
When the current flowed into the bay, Pb content was transported horizontally and vertically, settling to the seabed through surface water from surface and rising to the sea surface through the current [1-6]
Pb content in the surface layer increases rapidly with time. It indicates that the main sea current transported Pb to surface waters of Jiaozhou Bay
Summary
The main sea current entered Jiaozhou Bay through the bay mouth and surrounded the coastal waters with high lead (Pb) content. It left the inner waters of Jiaozhou Bay. When the current flowed into the bay, Pb content was transported horizontally and vertically, settling to the seabed through surface water from surface and rising to the sea surface through the current [1-6]. It is of great significance to study the deposition and migration process of Pb content in the main sea current transport to protect the marine environment and maintain ecological sustainable development.
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