Effect of nitrogen and phosphorus transport from Yangtze estuary on Zhoushan coastal areas

Abstract

There are few studies on nitrogen and phosphorus dispersion from the Yangtze estuary to adjacent Zhoushan sea areas in China. This study conducted numerical calculation to simulate the nitrogen and phosphorus transport from the Xuliujing section of the Yangtze Estuary to Zhoushan coastal areas. The effect of inorganic nitrogen transport was greater than that of active phosphorus. The concentration increment of inorganic nitrogen near Zhoushan, Daishan and Qushan islands were between 0.5mg/L and 0.8mg/L. The concentration increment of active phosphate near Shengsi was about 0.015mg/L, and those in the coastal areas of Qushan, east Daishan and northeast Zhoushan were between 0.015-0.02mg/L. To the north of Qushan Island, the percentage of inorganic nitrogen increment to the background was more than 70%, and those of other coastal areas were about 50%. The percentage of active phosphate increase to the background was more than 70% in the north of Shengsi, and the coastal areas from Dayangshan to Qushan were more than 50%. Daishan Island, East Coastal area and east side of Shengsi accounted for 30%.