| Summary: | According to the survey data of Jiaozhou Bay water body from 1984 to 1988, this paper analyzed and explored the data of Cd content each year, and studied the sources, water quality, distribution and migration conditions of Cd content in the waters of Jiaozhou Bay from the perspectives of volume, horizontal distribution, vertical distribution, seasonal distribution, regional distribution, structural distribution and tendency distribution. On the time scale, there are five migration processes of Cd content in the waters of Jiaozhou Bay. The author proposed five material migration theories to present the dynamic migration process of material in the water body. These rules, processes and theories not only provide solid theoretical bases for the migration of Cd content in the waters, but also provide enlightenment for the study of the migration of other substances in water bodies.
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