嘉陵江白庙子段地表水质季节变化特征及评价

Seasonal Variation Characteristics and Evaluation of Surface Water Quality in Baimiaozi Section,Jialing River

为了解河流表水中有机污染特征,于2016年9月-2017年9月连续监测了嘉陵江白庙子段水中5项水质指标的含量,并采用综合水质标识指数法进行评价。结果表明,嘉陵江白庙子段表水中各水质指标的含量均低于《地表水环境质量标准》(GB3838-2002)中Ⅲ类水质标准值。CODMn、BOD5含量的变化规律为丰水期>平水期>枯水期;DO、NH3-N为枯水期>平水期>丰水期;丰水期水中挥发酚低于枯水期与平水期。总体来说,丰水期水质好于平水期,平水期水质好于枯水期。

In order to understand the characteristics of organic pollution in river surface water,the contents of five water quality indexes in Baimiaozi section,Jialing River were continuously monitored from September,2016 to September,2017,and the water quality was evaluated by comprehensive water quality identification index method.Results showed that the contents of five water quality indexes were lower than the limits of ClassⅢin Environmental Quality Standard for Surface Water(GB 3838-2002).The variation of CODMn,BOD5 contents showed an order of the high-water period,normal-water period,low-water period from high to low,and the variation of DO,NH3-N contents showed an order of the low-water period,normal-water period,high-water period from high to low.The volatile phenol in water in high-water period was lower than that in low-water period and normal-water period.Generally speaking,the water quality in high-water period is better than that in normal-water period,the water quality in normal-water period is better than that in low-water period.