涠洲岛东南部海域高浓度氮和磷的来源分析

远离陆地的涠洲岛,是广西近海发生赤潮次数最多的海域。据现有调查资料显示,该海域氮含量属于二类水质,磷含量也时有超标,琼州海峡显然是其东南部大量氮磷物质的重要输送通道。本文通过分析多年的漂流瓶漂流路径图,然后结合数值计算结果,得出结论:琼州海峡西行水,主要来自珠江口和粤西沿岸,该地区的污染物质,包括氮磷等营养要素,可能是涠洲岛附近高浓度氮磷的主要来源。

Tracking the Source of High Concentration Nitrogen and Phosphorus Water in the Southeast of Weizhou Island

Weizhou Island is far from mainland, however, the occurrence of red tides is the most in Guangxi offshore.Survey data showed that the water grade was the second according to the content of nitrogen, while the content of phosphorus was frequently excessive.There were high concentration nitrogen and phosphorus water sources in the southeast of Weizhou Island.Apparently, Qiongzhou Strait was an important delivery channel.This paper analyzed the trajectories of long term drift bottles and then calculated the numerical results.It concluded that the water mass of westward current in Qiongzhou Strait came mainly from the Pearl River Estuary and the western coast of Guangdong Province, which may be the source of high concentration nitrogen and phosphorus water in the Weizhou Island.