摘要
根据2012年—2014年5月、8月、10月对五垒岛湾的调查数据,分析了该海域COD的分布特征及动态变化。结果表明：该海域近3年COD含量介于0.49~2.57mg/L,平均值为1.22mg/L;空间分布上,呈现出由北向南逐渐递减以及近岸水域含量大于远岸的变化趋势;年际间表现出逐渐增加的趋势。污染指数评价表明,COD污染指数介于0.16~0.93,平均0.41,均达到国家II类海水标准,未出现超标现象。
Based on the survey data in May,August and October from 2012 to 2014in the waters of Wuleidao Bay,Distribution characteristics and dynamic change of COD were analyzed.The result showed the content of COD in the waters ranged 0.49 to 2.57mg/L with an average of 1.22mg/L in the recent three years.The spatial distribution showed that values was gradually decreased trend from north to south,with a content in the coastal waters was higher than in the offshore waters.The content of COD was increasing trend year by year.The pollution index of COD ranged 0.16 to 0.93 with an average of 0.41.As viewed from the content of COD,the water quality was in the second class for the seawater quality set by the national standard.
