Cd Content with an Always High Vertical Diluted Amount

Dongfang Yang,Linzhen Wei,Tao Jiang,Shengjun Zhang,Xinmin Huang,G Yang,M Ziegler

doi:10.1051/e3sconf/202019801009

Abstract

Based on the investigation data about Cd in Jiaozhou Bay in August 1992 and the horizontal change model of matter content and the vertical change model of matter content proposed by the authors, the horizontal loss amount, vertical diluted amount and vertical sediment amount of Cd content in the surface and bottom layers from the southeast waters of the bay to the west waters of the bay mouth were calculated, and the model block diagram of the horizontal and vertical changes of Cd content was determined. The results show that in August, the absolutely loss amount of Cd content in the surface layer was 0.09μg/L, and the absolutely increase amount of Cd content in the bottom layer was 0.10μg/L. The relatively loss amount of Cd content in the surface layer was 12.00%, and the relatively increase amount of Cd content in the bottom layer was 41.66%. Cd content in the surface and bottom layershadabsolutely vertical diluted amount of 0.42-0.61μg/L, and its relatively vertical diluted amount was 63.63-81.33%. In August, in the horizontal migration of Cd content in the surface and bottom layers, the main sea current carried high Cd content in the surface waters.And after passing through the nearshore waters of the bay, one tenth of the Cd content in the surface layer settled to the seabed. In the horizontal migration process of Cd content in the surface layer, the loss amount of Cd content in the surface layer reached 12.00% in the nearshore waters around Jiaozhou Bay, thus the increase amount of Cd content in the bottom layer reached 41.66%. It reveals that the high Cd content in the surface layer could rapidly and continuously sink to the seabed, and the Cd content in the seabed waters in Jiaozhou Bay increased by 41.66%. In August, in the process of vertical migration, the Cd content transported by main sea current was relatively high, and the vertical diluted amount of Cd content in the surface and bottom layers was high 63.63 - 81.33% from the southeast waters of the bay to the waters in the west of the bay mouth.

Highlights

The main sea current enters Jiaozhou Bay with high content of cadmium (Cd) and goes from outside the bay through the bay mouth to inside the bay, which causes the Cd content in the seawater surface in Jiaozhou Bay to increase
Using the horizontal and vertical matter content change models proposed by the authors and the investigation data about Cd content in Jiaozhou Bay in August, 1992, the horizontal migration process and vertical sediment process of Cd content in Jiaozhou Bay waters are demonstrated, and the pollution process and pollution degree of polluted water bodies caused by Cd content transported by main sea current are explained, which provides scientific basis for the study of vertical sediment and horizontal migration of Cd content in the surface and bottom waters
There are more than a dozen rivers flowing into the sea in Jiaozhou Bay, among which Dagu River and Yanghe River, and Haibo River, Licun River and Loushan River in Qingdao urban area are with large runoff and sediment concentration [7, 8]

Summary

Introduction

The main sea current enters Jiaozhou Bay with high content of cadmium (Cd) and goes from outside the bay through the bay mouth to inside the bay, which causes the Cd content in the seawater surface in Jiaozhou Bay to increase. Located in the south of Shandong Peninsula, 120°04’120°23’E and 35°58’ - 36°18’N,JiaozhouBay is bounded by the connecting line between Tuan Island and Xuejia Island and communicates with the Yellow Sea, with an area of about 446km and an average water depth of about 7m. There are more than a dozen rivers flowing into the sea in Jiaozhou Bay, among which Dagu River and Yanghe River, and Haibo River, Licun River and Loushan River in Qingdao urban area are with large runoff and sediment concentration [7, 8]

Methods

Results

Discussion

Conclusion