五垒岛湾海域COD分布特征及动态变化

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0．49～2．57 mg／L ，平均值为1．22 mg／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 2014 in 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 .57 mg/L with an average of 1 .22 mg/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 con‐tent 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 seaw ater quality set by the national standard .