摘要
为研究乌坎河干流乌坎水闸国考断面年际水质状况及变化趋势,以广东省汕尾生态环境监测站提供的该监测断面2017~2021年的月度监测数据为基础,选取溶解氧(DO)、化学需氧量(COD_(Cr))、高猛酸盐指数(COD_(Mn))、五日生化需氧量(BOD_(5))、氨氮(NH_(3)-N)及总磷(TP)6个常规水质指标,采用单因子水质指数法及综合水质标识指数法对6个指标的年度平均值进行了评价,并用Spearman秩相关系数法对监测断面的综合水质变化趋势进行了定量分析。单因子水质指数分析结果表明:乌坎河干流乌坎水闸国考断面处溶解氧(DO)、五日生化需氧量(BOD_(5))、高猛酸盐指数(COD_(Mn))及总磷(TP)的单因子水质指数表现较好,而化学需氧量(COD_(Cr))及氨氮(NH_(3)-N)的单因子水质指数表现较差,部分年份存在超标现象;此外,氨氮(NH_(3)-N)的单因子水质指数呈现显著下降趋势,说明该指标有不断变好的趋势。综合水质指数分析结果表明:乌坎河干流乌坎水闸国考断面在2017~2021年期间,其综合水质指数均小于3,说明综合水质现状类别为《地表水环境质量标准》(GB3838-2002)Ⅱ类水质,均能达到“十三五”期间水环境功能区划目标要求,水质较稳定,且综合水质呈现变好的趋势。
In order to study the annual water quality status and changing trend of the section of Wukan Sluice of Wukan River,this paper researches the monthly monitoring data of the monitored section from 2017 to 2021 provided by Shanwei Ecological and Environmental Monitoring Station in Guangdong Province.Six conventional water quality indexes,including Dissolved Oxygen(DO),Chemical Oxygen Demand(COD_(Cr)),Hyperbolic Acid Index(COD_(Mn)),Biochemical Oxygen Demand at 5 days(BOD_(5)),Ammonia Nitrogen(NH_(3)-N)and Total Phosphorus(TP)are selected.The single factor water quality index method and comprehensive water quality identification index method are used for water quality evaluation,and the Spearman rank correlation coefficient method is used for quantitative analysis of the comprehensive water quality change trend of the monitoring section.The results show that the better single-factor water quality indexes are Dissolved Oxygen(DO),Biochemical Oxygen Demand at 5 days(BOD_(5)),Hyperbolic Acid Index(COD_(Mn))and and Total Phosphorus(TP),while the poorer single-factor water quality indexes are Ammonia Nitrogen(NH_(3)-N)and Chemical Oxygen Demand(COD_(Cr)),which exceed the standard in some years.In addition,the single factor water quality index of Ammonia Nitrogen(NH_(3)-N)shows a significant downward trend,indicating that this index has a trend of continuous improvement.And the comprehensive water quality index of the monitored sections of the main stream of the Section of Wukan Sluice from 2017 to 2021 is less than 3,indicating that the current comprehensive water quality is CategoryⅡwater quality according to Surface Water Environmental Quality(GB3838-2002),which can meet the water environmental function zoning objectives during the 13th Five-Year Plan period.Moreover,the water quality is relatively stable,and the comprehensive water quality shows a trend of improvement.
作者
甘秀梅
Gan Xiumei(Guangdong South China Environmental Protection Industry Technology Research Institute Co.,LTD.Guangzhou,Guangdong 510000,China)
出处
《绿色科技》
2022年第20期106-110,共5页
Journal of Green Science and Technology
关键词
乌坎河
国考断面
水质标识指数
水质评价
变化趋势
Wukan River
national examination section
comprehensive water quality identification index
water quality assessment
change trend
