云龙湖水质状况统计学分析

Statistical analysis of water quality change in Yunlong Lake

通过2013年1月至2017年12月云龙湖的9个水质监测点的逐月监测数据的统计学分析表明:云龙湖水质以《地表水环境质量标准(GB3838-2002)》Ⅲ~Ⅳ类为主,所占比例达61.67%;从单一水质指标分析,氨氮以Ⅱ类水为主,占68.3%;TN以Ⅳ类水为主,占56.7%;TP以Ⅱ类水为主,占85%;高锰酸盐指数100%满足Ⅲ类水标准。总体分析2015—2017年水质优于2013—2014年,2016年水质最好,除TN外,水质整体呈上升趋势,低温季节水质优于高温季节。相关性分析表明,DO和温度的负相关系数较高(R=-0.797),TP和浊度以及COD的相关性系数也比较大,总氮和氨氮的相关性较小。结合近年来云龙湖的治理工程分析,面源污染是云龙湖的主要污染源。

The analysis of the water quality data from January 2013 to December 2017 in Yunlong Lake showed that the water quality of Yunlong Lake belonged to ClassⅢ~Ⅳaccording to The Surface Water Environment Quality Standard(GB3838-2002),and its proportion was 61.67%.Based on the analysis of the single index of water quality,ammonia nitrogen was mainly ClassⅡwater,accounting for 68.3%;TN was mainly ClassⅣwater,accounting for 56.7%;TP was mainly ClassⅡwater,accounting for 85%;Permanganate index 100%,which meets ClassⅢwater standard.The general analysis showed that the water quality from 2015 to 2017 was better than that from 2013 to 2014,and the water quality in 2016 is the best.Except for TN,the overall water quality was improving.Water quality was better during the low temperature season than that of the high temperature season.Negative correlation coefficient of DO and temperature was high(R=-0.797),and the correlation coefficient of turbidity and COD and TP was higher,and the correlation of total nitrogen and ammonia nitrogen was lesser.According to the management engineering of Yunlong Lake in recent years,non-point source pollution was the main source of the lake.